All Calculators and Tools
Browse all calculators and tools in one place. This hub helps users quickly find the right calculator by topic, whether you need help with money, health, math, dates, measurements, writing tasks, or technical problems.
What You'll Find Here
This page is designed as the main discovery hub for the site. Use it to explore calculator categories, compare tool types, and jump into the calculator that matches your task fastest.
Explore by Category
Finance
Mortgage, loan, compound interest, and financial planning calculators.
Business
Business calculators for margin, markup, ROI, break-even, and discount planning.
Health & Fitness
BMI, calorie, TDEE, macro, and body composition calculators.
Education & Math
GPA, grade, fraction, Roman numeral, and scientific calculators.
Time & Date
Age, date difference, military time, and time zone tools.
Writing & Utility
Writing and utility tools for counting, formatting, and quick text workflows.
Converters
Convert units for length, weight, temperature, and more with fast utility converters.
Construction & Home
Square footage, concrete, mulch, gravel, and fuel cost calculators.
Tech
Subnet calculator and network utilities.
Tool Highlights
You can explore calculators across several core categories:
- 💰Mortgage, loan, compound interest, and financial planning calculators.
- 📊Business calculators for margin, markup, ROI, break-even, and discount planning.
- ❤️BMI, calorie, TDEE, macro, and body composition calculators.
- 📐GPA, grade, fraction, Roman numeral, and scientific calculators.
- ⏰Age, date difference, military time, and time zone tools.
- ✍️Writing and utility tools for counting, formatting, and quick text workflows.
- 🔁Convert units for length, weight, temperature, and more with fast utility converters.
- 🏠Square footage, concrete, mulch, gravel, and fuel cost calculators.
- 💻Subnet calculator and network utilities.
All Recently Built Tools
Tip Calculator
Calculate tips fast or split a bill with tip between people. Use this tip calculator to find tip amount, total bill, and tip per person.
Open toolRoman Numeral Converter
Convert Roman numerals to numbers and numbers to Roman numerals. Includes standard Roman numeral rules, limits, and examples.
Open toolRandom Number Generator
Generate a random number in any range for raffles, games, classroom picks, testing, and quick random selection.
Open toolPassword Generator
Create a strong password with custom length, symbols, numbers, and mixed characters. Generate passwords quickly and store them safely.
Open toolSquare Footage Calculator
Calculate square footage instantly for any room or surface. Supports rectangles, circles, and triangles. Free, fast, and accurate area calculator in square feet.
Open toolMortgage Calculator
Use this mortgage calculator to estimate your monthly mortgage payment, total interest, and total cost of a home loan. Includes property tax, insurance, and HOA.
Open toolBMI Calculator
Use this BMI calculator to check your body mass index based on height and weight. Supports metric and US units with instant results and BMI category.
Open toolDate Difference Calculator
Calculate the exact number of days, weeks, months, and years between two dates. Use this date difference calculator for planning, deadlines, and duration tracking.
Open toolGrade Calculator
Find out exactly what grade you need on your final exam to get an A, B, or pass the class, based on your current grade and how much the final is weighted.
Open toolWord Counter Tool
Count words, characters, sentences, and paragraphs instantly with this free word counter tool.
Open toolAge Calculator
Calculate exact age from date of birth in years, months, and days. Also see total days lived and days until next birthday.
Open toolGPA Calculator
Calculate your weighted GPA by entering course grade points and credit hours. Instant GPA result with total credits.
Open toolCompound Interest Calculator
Estimate future investment value and interest earned using compound interest, with optional recurring contributions and adjustable compounding frequency.
Open toolMilitary Time Converter
Convert between 12-hour and 24-hour military time instantly, and look up any hour on the full 0000 to 2300 military time chart with AM and PM equivalents.
Open toolConcrete Calculator
Work out how many cubic yards of concrete a slab needs, and how many 40, 60, or 80 lb bags that equals. Includes the bags-per-yard rule.
Open toolMulch Calculator
Work out exactly how many bags or cubic yards of mulch you need from bed size and depth. Includes waste allowance and the bags-per-yard rule.
Open toolGravel Calculator
Work out how many tons or cubic yards of gravel you need from length, width, and depth. Includes the tons-per-yard rule and coverage per ton.
Open toolFuel Cost Calculator
Estimate fuel usage and total trip cost from distance, fuel efficiency, fuel price, and number of trips, for road trips, commutes, and travel budgets.
Open toolRunning Pace Calculator
Calculate your running pace, speed, and finish time from distance and time, with results in minutes per mile or kilometer for races and training.
Open toolSleep Calculator
Find the best time to go to bed or wake up based on 90-minute sleep cycles. Waking between cycles instead of mid-cycle helps you feel less groggy.
Open toolSubnet Calculator
Calculate the subnet mask, network address, broadcast address, and usable host range from any IP address and CIDR prefix, with results for IPv4 networks.
Open toolDate Calculator
Find a date 90, 60, 45, or 30 days from today. Add or subtract days, weeks, months, or years from any start date.
Open toolFraction Calculator
Add, subtract, multiply, and divide fractions, then get the simplified fraction plus its decimal result, with clear steps for each fraction operation.
Open toolInflation Calculator
Estimate what a purchase will cost after inflation and how much purchasing power your money loses over time, using a CPI-style annual inflation rate.
Open toolPaycheck Calculator
Estimate your 2026 take-home pay from hourly rate, hours, overtime, and taxes. See how much comes out of each paycheck and what you keep as net pay.
Open toolCredit Card Payoff Calculator
Estimate how long it takes to pay off credit card debt and how much interest you will pay, based on your balance, interest rate, and monthly payment.
Open toolTDEE Calculator
Calculate your TDEE and BMR with the Mifflin-St Jeor equation from weight, height, age, sex, and activity level, then plan daily calories for any goal.
Open toolMacro Calculator
Calculate your daily macro targets in grams for protein, carbs, and fat from your calorie goal and chosen macro split, for any diet or training plan.
Open toolBody Fat Calculator
Estimate your body fat percentage from weight, height, age, and sex using a formula-based method, with a result and category for quick reference.
Open toolIdeal Weight Calculator
Estimate ideal body weight using height and sex with the Devine formula. View a practical target range in kg or lb.
Open toolTime Zone Converter
Convert date and time between UTC offsets quickly. Useful for remote meetings, travel planning, and international scheduling.
Open toolPercentage Calculator
Calculate percentages quickly: percent of a number, what percent one value is of another, and percent increase or decrease.
Open toolCalorie Calculator
Estimate your daily calorie needs from age, sex, height, weight, activity level, and goal, for maintaining, losing, or gaining weight at a steady rate.
Open toolLoan Calculator
Estimate monthly loan payments, total paid amount, and total interest using principal, rate, and loan term.
Open toolRetirement Calculator
Estimate retirement savings growth based on current savings, monthly contributions, expected return, and retirement age.
Open toolScientific Calculator
Evaluate arithmetic expressions with parentheses, percentages, and operator precedence using this online scientific calculator.
Open toolCurrency Converter
Convert between common world currencies instantly using reference exchange rates, with quick results for travel, shopping, and everyday money math.
Open toolPregnancy Due Date Calculator
Estimate your pregnancy due date from your last menstrual period using the standard 280-day gestation method, plus your current week of pregnancy.
Open toolOvulation Calculator
Estimate ovulation date, fertile window, and next period date using last period date and cycle length.
Open toolTime Calculator
Use this time calculator to add or subtract hours and minutes from a start time and get an exact end time.
Open toolHours Calculator
Use this hours calculator to find total hours and minutes between two times, including optional break deduction.
Open toolCharacter Counter
Use this character counter to instantly count characters, characters without spaces, words, and lines.
Open toolSentence Counter
Count sentences, words, and paragraphs instantly for essays, reports, blog drafts, and editing reviews.
Open toolUnit Converter
Use this unit converter to convert values across length, weight, and temperature units quickly and accurately.
Open toolLength Converter
Convert mm to inches, inches to feet, cm to feet, km to miles, and meters to feet. Free length converter for metric and imperial units.
Open toolWeight Converter
Convert ounces to pounds, grams to ounces, grams to pounds, and pounds to kg. Free weight converter for kg, lb, g, mg, and oz.
Open toolTemperature Converter
Convert Celsius to Fahrenheit or Fahrenheit to Celsius instantly. Also supports Kelvin. Free C to F and F to C converter.
Open toolJSON Formatter
Use this free JSON formatter to format, validate, beautify, and minify JSON in your browser, with no upload so your data stays on your own device.
Open toolInvestment Calculator
Use this investment calculator to estimate future portfolio value from initial amount, recurring contributions, and projected return rate.
Open toolVolume Converter
Convert ml to oz, oz to ml, quarts to gallons, and more. Free volume converter for liters, milliliters, gallons, cups, pints, and quarts.
Open toolArea Converter
Use this area converter to convert square meters, square feet, acres, hectares, and other common area units.
Open toolSpeed Converter
Use this speed converter to convert mph, km/h, m/s, knots, and ft/s quickly with standard conversion factors.
Open toolData Storage Converter
Use this data storage converter to convert bytes, decimal KB/MB/GB/TB, and binary KiB/MiB/GiB/TiB units.
Open toolCase Converter
Use this case converter to transform text into upper case, lower case, title case, sentence case, camelCase, snake_case, and more.
Open toolReading Time Calculator
Use this reading time calculator to estimate how long content takes to read based on word count and words-per-minute assumptions.
Open toolURL Encoder Decoder
Use this URL encoder decoder to safely encode or decode URL components and handle invalid encoded input clearly.
Open toolBase64 Encoder Decoder
Use this Base64 encoder decoder to encode text to Base64 or decode Base64 back to UTF-8 text with clear invalid-input handling.
Open toolQR Code Generator
Use this QR code generator to create downloadable QR codes from text or URLs. Generate client-side and test before publishing.
Open toolAmortization Calculator
Use this amortization calculator to estimate monthly payment, total interest, and loan payoff schedule from loan amount, rate, and term.
Open toolAuto Loan Calculator
Use this auto loan calculator to estimate car loan monthly payment, total interest, and total cost using price, down payment, rate, term, tax, and fees.
Open toolSavings Calculator
Use this savings calculator to estimate future savings balance from starting amount, monthly contributions, interest rate, and compounding frequency.
Open toolCD Calculator
Use this CD calculator to estimate certificate of deposit maturity value from deposit amount, APY, term length, and compounding frequency.
Open toolSalary Calculator
Use this salary calculator to estimate annual salary from gross pay and pay frequency, with monthly and weekly equivalents.
Open toolHourly to Salary Calculator
Use this hourly to salary calculator to convert hourly wage into estimated annual, monthly, and weekly gross salary using hours and weeks worked.
Open toolSalary to Hourly Calculator
Convert annual salary to an hourly rate using your real hours and weeks worked. Includes a salary-to-hourly chart from $30,000 to $100,000.
Open toolOvertime Calculator
Calculate overtime pay and your time-and-a-half rate from any hourly wage. Enter regular hours, overtime hours, and the multiplier to see total gross pay.
Open toolPay Raise Calculator
Calculate your new salary after a raise. Enter your current pay and the raise percentage to see your new pay, the dollar increase, and the change per paycheck.
Open toolRule of 72 Calculator
Use the Rule of 72 to estimate how long an investment takes to double. Enter your annual return to see the years to double, the exact figure, and the time to triple.
Open toolDebt Payoff Calculator
Use this debt payoff calculator to estimate payoff timeline, total interest, and total amount paid using balance, APR, and monthly payment.
Open toolBMR Calculator
Use this BMR calculator to estimate basal metabolic rate using the Mifflin-St Jeor method based on age, sex, height, and weight.
Open toolProtein Calculator
Use this protein calculator to estimate daily protein intake from body weight and fitness goal assumptions.
Open toolWater Intake Calculator
Use this water intake calculator to estimate daily hydration based on body weight, activity, and climate assumptions.
Open toolOne Rep Max Calculator
Use this one rep max calculator to estimate 1RM from lifted weight and reps using the Epley formula.
Open toolProfit Margin Calculator
Use this profit margin calculator to estimate profit and profit margin percentage from revenue and cost.
Open toolMarkup Calculator
Use this markup calculator to estimate markup amount, markup percentage, and margin from cost and selling price.
Open toolBreak Even Calculator
Use this break even calculator to estimate break-even units and break-even revenue using fixed costs, variable cost per unit, and selling price.
Open toolROI Calculator
Use this ROI calculator to find net return and return on investment percentage from your total gain and total cost, with a clear breakdown of the result.
Open toolDiscount Calculator
Use this discount calculator to estimate sale price and savings from a discount percentage or discount amount.
Open toolBusiness Days Calculator
Use this business days calculator to count business days between dates with weekend handling and optional holiday exclusions.
Open toolCalories Burned Calculator
Use this calories burned calculator to estimate calories burned from activity, body weight, duration, and MET assumptions.
Open toolHeart Rate Zone Calculator
Use this heart rate zone calculator to estimate training heart rate zones using age-based max heart rate and optional resting heart rate.
Open toolBandwidth Calculator
Use this bandwidth calculator to estimate required bandwidth from data size and transfer time with unit conversion support.
Open toolDownload Time Calculator
Use this download time calculator to estimate transfer time from file size and connection speed with unit conversion support.
Open toolAOV Calculator
Use this AOV calculator to estimate average order value from total revenue and total order count.
Open toolConversion Rate Calculator
Use this conversion rate calculator to estimate conversion percentage from visitors and conversions.
Open toolCPC Calculator
Use this CPC calculator to find your average cost per click from total ad spend and clicks, a key metric for Google Ads and paid search budgets.
Open toolCPM Calculator
Use this CPM calculator to estimate cost per thousand impressions from ad spend and impressions.
Open toolROAS Calculator
Use this ROAS calculator to estimate return on ad spend ratio and percentage from revenue and ad spend.
Open toolACV Calculator
Estimate annual contract value (ACV) from total contract value and contract length in months.
Open toolData Transfer Calculator
Use this data transfer calculator to estimate transfer time, required speed, or transferable size with explicit unit assumptions.
Open toolIP Address Calculator
Use this IP address calculator to analyze any IPv4 address, including its binary form, integer value, address class, and common private or reserved ranges.
Open toolCIDR Calculator
Use this CIDR calculator to analyze IPv4 CIDR notation, subnet mask, network/broadcast addresses, and usable host ranges.
Open toolBinary Calculator
Use this binary calculator to perform binary arithmetic and view decimal/binary conversion results with clear input validation.
Open toolHex Calculator
Use this hex calculator to perform hexadecimal arithmetic and view decimal/hex conversion results with clear input validation.
Open toolHours Worked Calculator
Use this hours worked calculator to calculate shift duration, break deductions, decimal hours, and optional overtime hours.
Open toolCountdown Calculator
Count down to any date or holiday. One tap shows the days until Halloween, Christmas, Thanksgiving, Easter, and more, with a day, hour, minute, and second breakdown.
Open toolUUID Generator
Generate UUIDs in your browser with this UUID generator. Client-side generation only, with UUID v4 support.
Open toolHash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes client-side. Hashes are one-way and not encryption.
Open toolAspect Ratio Calculator
Use this aspect ratio calculator to simplify ratios and resize width or height while keeping the same proportion, ideal for images, video, and screens.
Open toolDPI Calculator
Use this DPI calculator to estimate DPI/PPI from pixel resolution and physical display size.
Open toolPaint Calculator
Estimate how much paint you need from wall area, number of coats, paint coverage, doors and windows, and a waste allowance, in liters or gallons.
Open toolTile Calculator
Use this tile calculator to estimate tile quantity from floor area, tile size, and waste percentage.
Open toolFlooring Calculator
Estimate flooring area, waste-adjusted coverage, and the number of boxes you need, for hardwood, laminate, vinyl, or tile flooring projects.
Open toolCalorie Deficit Calculator
Estimate daily calorie targets from BMR, activity level, and a selected deficit percentage with clear assumptions.
Open toolDay of Week Calculator
Use this day of week calculator to find the weekday for a selected date, including ISO weekday number.
Open toolDeck Mud Calculator
Find how much deck mud you need from square feet and thickness. Returns mud volume plus sand and Portland cement bags using the 5-to-1 floor mud recipe.
Open toolBoard Foot Calculator
Calculate board feet from thickness, width, and length, plus total cost per board foot. Includes a chart of board feet for common lumber sizes like 2x6x8.
Open tool401(k) Calculator
Project your 401(k) balance at retirement, including employer match. See how much comes from your contributions, the company match, and investment growth.
Open toolMortgage Refinance Calculator
See if refinancing your mortgage is worth it. Compare your current payment with a new rate, find your monthly savings, and get the break-even point in months.
Open toolRent vs Buy Calculator
Compare the full cost of renting against buying a home over the years you plan to stay. See which is cheaper, your total cost each way, and the break-even picture.
Open toolNet Worth Calculator
Calculate your net worth by adding up what you own and subtracting what you owe. See your total assets, total debts, and how you compare by age.
Open toolClosing Costs Calculator
Estimate buyer closing costs on a home by price and down payment. See your total fees, what percent of the price they are, and total cash to close.
Open toolStair Calculator
Calculate how many steps you need, adjusted riser height, total run, stair angle, and stringer length. Enter your floor-to-floor height and target riser dimensions.
Open toolDrywall Calculator
Calculate how many drywall sheets you need for any room. Enter wall length, height, and openings to get an accurate sheet count with waste allowance.
Open toolFence Calculator
Calculate how many posts, rails, and pickets you need for a wood fence. Enter fence length, height, and spacing to get a full materials list.
Open toolGrass Seed Calculator
Calculate how many pounds and bags of grass seed your lawn needs. Covers new seeding and overseeding rates with a built-in waste allowance.
Open toolStud Calculator
Calculate how many wall studs you need for any wall length at 16 or 24 inch on-center spacing. Includes extras for corners and openings, plus plate lumber totals.
Open toolRoofing Calculator
Estimate roof area, roofing squares, and shingle bundles for any roof size and pitch. Adds a waste factor and an optional shingle cost so you can order the right amount.
Open toolBrick Calculator
Estimate how many bricks you need for a wall from its length, height, and brick size. Adds a waste factor and an optional cost per brick so you can order with confidence.
Open toolSubfloor Calculator
Calculate how many sheets of plywood or OSB subfloor you need for any room. Enter the room size and sheet size to get a sheet count with waste included.
Open toolInsulation Calculator
Calculate how many bags or rolls of insulation you need for an attic, wall, or floor. Enter the area and the coverage per bag to get a bag count with waste.
Open toolPaver Calculator
Calculate how many pavers you need for a patio or walkway from your area and paver size, with a waste allowance for cuts and breakage.
Open toolSales Tax Calculator
Calculate sales tax on any purchase, or work backward to find the pre-tax price from a tax-inclusive total. Enter the amount and your local tax rate.
Open toolRandom Name Generator
Generate random first names, last names, or full names with a gender filter. Pick how many you want, from 1 to 50, for characters, testing, and ideas.
Open toolHome Affordability Calculator
Estimate how much house you can afford based on your income, debts, down payment, and interest rate. Uses the 28/36 rule to show your max home price and monthly payment.
Open toolDebt-to-Income Ratio Calculator
Calculate your debt-to-income ratio from your gross monthly income and debt payments. See your DTI percentage and how lenders rate it for loan approval.
Open toolCTR Calculator
Calculate click-through rate from clicks and impressions. See your CTR as a percent plus clicks per 1,000 impressions for ads, email, and search.
Open toolCommission Calculator
Calculate sales commission from your revenue and commission rate. See commission, total earnings with a base salary, and commission per $1,000 of sales.
Open toolCooking Measurement Converter
Convert cups to ounces, ounces to cups, grams to cups, and more. Free cooking measurement converter for cups, tablespoons, teaspoons, fluid ounces, and grams.
Open toolCircle Calculator
Calculate the area of a circle, circumference of a circle, and diameter from a radius or diameter. Free circle calculator with step-by-step formulas.
Open toolHeight Converter
Convert height from feet and inches to centimeters, or cm to feet and inches. Free height converter for body height using the 2.54 cm per inch standard.
Open toolTime Clock Calculator
Use this time clock calculator to add up clock-in and clock-out times across the week, deduct breaks, and get total hours, overtime, and gross pay.
Open toolRoth IRA Calculator
Use this Roth IRA calculator to project your retirement balance from your age, current savings, yearly contribution, and expected annual return.
Open toolDistance Formula Calculator
Find the straight-line distance between two points on a coordinate plane. Enter the x and y values for both points and get the distance using d = sqrt((x2-x1)^2 + (y2-y1)^2).
Open toolAverage Calculator
Find the mean, median, mode, and range of any number set. Paste comma or space separated numbers and get the average plus count, sum, min, and max.
Open toolCylinder Calculator
Calculate the volume and surface area of a cylinder from its radius and height. Free cylinder calculator that also returns lateral surface area and base area.
Open toolDog Age Calculator
Convert your dog's age into human years with a size-adjusted method. Enter your dog's age and breed size to get an estimated human age and life stage.
Open toolAnnual Income Calculator
Convert pay from hourly, daily, weekly, biweekly, semimonthly, or monthly into annual income. See your yearly, monthly, and weekly figures with one calculator.
Open toolSteps to Miles Calculator
Convert steps to miles, kilometers, and feet based on your stride length. Find out how many miles 10,000 steps is and how many steps are in a mile.
Open toolMinutes to Hours Converter
Convert minutes to hours fast. Enter a number of minutes to get the decimal hours, an hours-and-minutes breakdown, seconds, and days.
Open toolSquare Root Calculator
Find the square root of any non-negative number. Enter a value to get the principal square root, the negative root, and whether the number is a perfect square.
Open toolMidpoint Calculator
Find the midpoint between two points on a coordinate plane. Enter the x and y values for both points and get the midpoint using M = ((x1 + x2) / 2, (y1 + y2) / 2).
Open toolSlope Calculator
Find the slope of a line between two points using m = (y2 - y1) / (x2 - x1). Enter both points to get the slope, rise, run, angle, y-intercept, and the line equation.
Open toolWeeks in a Month Calculator
Find how many weeks are in a month. Pick any month and year to get the exact weeks as a decimal plus a whole-weeks-and-days breakdown.
Open toolHours in a Week Calculator
There are 168 hours in a week. Use this calculator to convert any number of weeks into hours, days, minutes, and seconds.
Open toolRectangular Prism Calculator
Calculate the volume, surface area, and diagonal of a rectangular prism. Enter length, width, and height to get all results at once.
Open toolHeat Index Calculator
Find the heat index from temperature and humidity. Enter the air temperature in Fahrenheit and the relative humidity to get the feels-like temperature and risk level.
Open toolRight Triangle Calculator
Solve a right triangle from its two legs. Get the hypotenuse, area, perimeter, and both acute angles using the Pythagorean theorem.
Open toolScientific Notation Converter
Convert any number to scientific notation. Enter a value to get the coefficient, the power of ten exponent, and the E-notation form.
Open toolLong Division Calculator
Divide two numbers to get the quotient, remainder, and decimal answer. Enter a dividend and divisor to solve the division.
Open toolMoney Counter
Count cash fast. Enter how many of each US bill and coin you have to get the total, the bills subtotal, and the coins subtotal.
Open toolWeeks Left in the Year Calculator
Find how many weeks are left in the year from any date. Get the weeks remaining as a decimal, a weeks-and-days breakdown, and how much of the year is done.
Open toolColor Mixer
Mix two colors and see the result as a hex and RGB value. Set the blend ratio, learn the primary colors, and find what two colors make purple, green, or orange.
Open toolLove Compatibility Calculator
Enter two names and get a fun love compatibility score from 0 to 99. A quick name-based compatibility test for couples, crushes, and friends, just for fun.
Open toolWeeks in a Year Calculator
Find how many weeks are in a year. A normal year has 52.14 weeks and a leap year has 52.29 weeks. Enter any year for the exact weeks-and-days breakdown.
Open toolBinary Translator
Translate text to binary and binary back to text. Each character becomes an 8-bit binary group using UTF-8, so accents and emoji convert correctly.
Open toolMonthly Calendar Generator
Make a printable calendar for any month and year. Pick the month, set the week to start on Sunday or Monday, and print or save a clean monthly grid.
Open toolSeasons Calculator
Find when each season starts in any year. See the first day of spring, summer, fall, and winter by the astronomical or meteorological calendar, for either hemisphere.
Open toolWorld Clock
See what time it is right now in any city. Live clocks for New York, London, Tokyo, Dubai, Arizona, Hawaii, and more, with the current UTC offset for each.
Open toolTime Unit Converter
Convert between seconds, minutes, hours, days, weeks, and years. See how many seconds are in a year or a day, and switch any time unit to another instantly.
Open toolAngle Converter
Convert angles between radians, degrees, and gradians. Turn radians to degrees or degrees to radians instantly, with the exact pi-based relationship.
Open toolFraction to Decimal Converter
Convert a fraction to a decimal or a decimal to a simplified fraction. Enter 3/4 to get 0.75, or 0.75 to get 3/4, with the answer reduced for you.
Open toolmcg to mg Converter
Convert micrograms (mcg) to milligrams (mg) and back. 1 mg equals 1000 mcg, so 500 mcg is 0.5 mg. Convert mcg, mg, and grams for supplement and dosage labels.
Open toolStandard Deviation Calculator
Calculate sample or population standard deviation from any list of numbers. Get the standard deviation plus variance, mean, count, and sum in one step.
Open toolQuadratic Formula Calculator
Solve any quadratic equation ax^2 + bx + c = 0 with the quadratic formula. Enter a, b, and c to get both roots, the discriminant, and the nature of the solutions.
Open toolColor Converter
Convert any color between HEX, RGB, and HSL. Paste a hex code, an rgb value, or an hsl value and get all three formats back, with a live color swatch.
Open toolRandom Wheel
Add your options one per line, spin the wheel, and land on one at random. A free spin-the-wheel picker for names, lunch spots, prizes, and quick decisions.
Open toolSimple Interest Calculator
Calculate simple interest on a loan or deposit from principal, annual rate, and time in years. See total interest, final balance, and monthly equivalent.
Open toolA good calculator hub should save time before the user even clicks into a tool. Grouping tools by category makes it easier to compare similar calculators, find related tasks, and move through the site naturally. It also helps users understand which calculator is best for the problem they are trying to solve.