📐Education & Math
GPA, grade, fraction, Roman numeral, and scientific calculators.
Find education and math calculators for schoolwork, study sessions, and practical number problems. This category brings together grade and GPA tools, fraction and percentage calculators, scientific and geometry tools, notation converters, and core algebra or statistics helpers so you can check work, understand inputs, and move through assignments faster.
What You'll Find Here
You will find tools that support both classroom tasks and general problem solving. Grade, Test Grade, and GPA calculators help with academic tracking. Fraction, percentage, average, standard deviation, and long division tools help with everyday arithmetic and statistics. Circle, rectangle, cylinder, triangle, slope, midpoint, arc length, and distance formula tools help with geometry and coordinate math. Roman numeral, scientific notation, fraction-to-decimal, and angle conversion tools help when the task is translating numbers into the format a class, worksheet, or exam expects.
All Education & Math Tools
Roman Numeral Converter
Convert whole numbers to Roman numerals and Roman numerals to numbers. Includes standard rules, symbol values, worked examples, and common mistakes.
Open toolGrade Calculator
Find the exact final exam score needed to hit your target course grade based on your current average and the final's weight.
Open toolGPA Calculator
Calculate your weighted GPA by entering course grade points and credit hours. Instant GPA result with total credits and total quality points.
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 toolScientific Calculator
Evaluate arithmetic expressions with decimals, parentheses, and percentages using this online scientific calculator for quick homework, shopping, and everyday math.
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 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 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 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 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 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 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 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 toolTest Grade Calculator
Enter total questions and how many were missed to get the test score and letter grade. Missing 3 of 20 questions scores 85%, a B.
Open toolPercentage Increase Calculator
Calculate percentage increase or decrease between two numbers. Going from 100 to 125 is a 25% increase. Shows the change and direction.
Open toolTrigonometry Calculator
Calculate sin, cos, tan, and right-triangle sides from an angle. Enter an angle and pick a known side to get all six trig ratios and the other two sides.
Open toolArc Length Calculator
Calculate arc length and sector area from radius and central angle. Enter the angle in degrees or radians and get the arc length, sector area, and circumference.
Open toolRectangle Calculator
Calculate the area, perimeter, and diagonal of a rectangle from length and width. Free rectangle calculator with step-by-step formulas and a quick reference table.
Open toolCircumference to Diameter Calculator
Convert circumference to diameter by dividing by pi. A circle with a circumference of 31.4 has a diameter of about 10. Works in both directions and shows the radius.
Open toolPercentage Change Calculator
Calculate percentage change between two numbers. Going from 40 to 50 is a 25% increase, while 50 to 40 is a 20% decrease. See the formula and worked examples.
Open toolPercentage Difference Calculator
Calculate the percentage difference between two numbers. Comparing 40 and 60 gives a 40% difference, measured against their average. Order does not matter.
Open toolLog Base 2 Calculator
Calculate log base 2 of any positive number. Log2 of 8 is 3 because 2 to the power 3 equals 8. Also shows log base 10 and the natural log.
Open toolInverse Tangent Calculator (Arctan)
Calculate tan inverse (arctan) of any number. Arctan of 1 is 45 degrees, arctan of 0.5 is about 26.57 degrees. Results in degrees and radians.
Open toolRemainder Calculator
Find the remainder and quotient of any division. 23 divided by 5 is 4 remainder 3, since 5 x 4 + 3 = 23. Handles negative numbers the standard math way.
Open toolP-Value Calculator
Convert a z-score to a p-value. A z-score of 1.96 gives a two-tailed p-value of 0.05, the classic significance threshold. Two-tailed and one-tailed tests.
Open toolTriangle Area Calculator
Find the area of a triangle from base and height, three sides (Heron's formula), or two sides and an angle. A triangle with base 10 and height 6 has area 30.
Open toolPercentage Decrease Calculator
Calculate percentage decrease between two values. A price falling from $80 to $60 is a 25% decrease. Shows the formula, the raw difference, and worked examples.
Open toolAntilog Calculator
Calculate the antilog of any number. The antilog of 3 in base 10 is 1000, because 10 to the power 3 equals 1000. Works with base 10, base e, or any base.
Open toolAverage Percentage Calculator
Average multiple percentages correctly. Test scores of 72%, 85%, and 90% average to 82.33%. Supports weighted averages when the groups differ in size.
Open toolHemisphere Volume Calculator
Find the volume of a hemisphere with V = (2/3) pi r cubed. A hemisphere with radius 6 has a volume of about 452.4. Also computes surface areas.
Open toolSector Area Calculator
Find the area of a circle sector from radius and central angle. A 90 degree sector of a radius 8 circle has an area of 50.27, a quarter of the full circle.
Open toolCone Volume Calculator
Find the volume of a cone with V = (1/3) pi r squared h. A cone with radius 4 and height 9 has a volume of about 150.8. Also computes slant height and surface area.
Open toolSphere Volume Calculator
Find the volume of a sphere from its radius, then check the matching surface area and diameter with clear formulas, worked examples, and a quick radius table.
Open toolDice Average Calculator
Find the average roll of any dice combination. 2d6 averages 7, and 13d8 averages 58.5. Works for any count, any sides, and flat modifiers.
Open toolSemicircle Area Calculator
Find the area of a semicircle with A = pi r squared / 2. A semicircle with radius 5 has an area of 39.27 and a perimeter of 25.71 including the flat edge.
Open toolRoulette Payout Calculator
Calculate roulette payouts and odds for every bet type. A $10 straight bet pays $350 at 35 to 1, with a 2.7% chance on a European wheel. Compare house edges.
Open tool45 45 90 Triangle Calculator
Solve a 45 45 90 triangle from one side. With legs of 5, the hypotenuse is 5 times sqrt 2, about 7.07. Get all sides, area, and perimeter instantly.
Open toolProbability Calculator
Calculate probability from favorable and total outcomes. Drawing an ace from a deck is 4 in 52, a 7.69% chance with odds of 1 to 12. Includes repeated trials.
Open toolCoin Flip Probability Calculator
Calculate the probability of getting heads in coin flips. Exactly 5 heads in 10 flips has a 24.61% chance, while at least 5 heads is 62.3%. Binomial math.
Open toolTrapezoid Area Calculator
Calculate the area of a trapezoid from its two parallel bases and perpendicular height. Includes the median length, worked examples, and clear formula notes.
Open toolCritical Value Calculator
Find the z or t critical value for any confidence level, one-tailed or two-tailed test, and degrees of freedom. Instant results with worked examples.
Open toolHexagon Calculator
Calculate the area, perimeter, apothem, circumradius, and diagonal lengths of a regular hexagon from a single side length. Free hexagon calculator with formulas.
Open toolExponential Growth Calculator
Calculate exponential growth or decay from a starting value, rate, and time. Get the final value, doubling or halving time, and both discrete and continuous compounding.
Open toolSquare Diagonal Calculator
Calculate the diagonal of a square from its side length, or the side length from a diagonal. Free calculator with area, perimeter, and step-by-step formulas.
Open toolVertex Form Calculator
Convert y = ax^2 + bx + c into vertex form and find a parabola's vertex, axis of symmetry, and direction. Enter a, b, and c to get the turning point instantly.
Open toolMultiplication Calculator
Multiply two numbers to get the product, plus a step-by-step partial-products breakdown for whole-number factors.
Open toolSignificant Figures Calculator
Count and round significant figures in decimal or scientific notation. Keep written zeros, choose 1 to 15 sig figs, and see the rounded result.
Open toolEquilateral Triangle Calculator
Find the area, height, perimeter, inradius, and circumradius of an equilateral triangle from one side length with exact standard formulas.
Open toolTrapezoidal Prism Volume Calculator
Calculate trapezoidal prism volume from two parallel bases, the perpendicular trapezoid height, and prism length. See base area and the full method.
Open toolCross-Sectional Area Calculator
Calculate the cross-sectional area of a solid round bar or hollow pipe from outer and inner diameters, including wall thickness and component areas.
Open toolPyramid Volume Calculator
Find rectangular pyramid volume from base length, base width, and perpendicular height. See base area, formula steps, examples, and unit guidance.
Open toolCross Multiplication Calculator
Solve a proportion in the form a/b = c/x with cross multiplication. See the missing value, equal cross products, formula, and worked examples.
Open toolGolden Ratio Calculator
Split any length into two segments using the golden ratio (phi, approximately 1.618). Enter a total and get the longer segment, shorter segment, and ratio check.
Open toolCartesian to Polar Calculator
Convert Cartesian (x, y) coordinates to polar (r, theta) and back. Get the radius, the angle in degrees and radians, and the quadrant, all rounded for quick checks.
Open toolAngular Velocity Calculator
Calculate angular velocity (omega) in rad/s from an angle and time, from linear speed and radius, or from rpm. Get instant conversions to rpm, degrees per second, and rotation period.
Open toolConcentration Calculator (Molarity)
Calculate solution molarity in mol/L from moles and volume, or from mass, molar mass, and volume. Get the concentration, moles of solute, and mmol/L instantly.
Open toolHypotenuse Calculator
Find the hypotenuse of a right triangle from two legs, or solve for a missing leg from the hypotenuse and one side. Uses the Pythagorean theorem c = sqrt(a squared plus b squared).
Open toolMole Calculator
Convert between moles, mass in grams, and molar mass with one tool. Solve for any of the three values and see the number of particles using Avogadro's number.
Open toolPythagorean Theorem Calculator
Solve a right triangle with the Pythagorean theorem. Find the hypotenuse from two legs, or find a missing leg from the hypotenuse and one leg, plus area and perimeter.
Open toolT-Statistic Calculator
Calculate the one-sample t statistic from a sample mean, population mean, sample standard deviation, and sample size. See the t score, degrees of freedom, and standard error instantly.
Open toolTorque Calculator
Calculate torque from force, lever arm, and angle using tau = F times r times sin(theta). Get results in newton-meters and pound-feet with the effective lever arm shown.
Open toolVelocity Calculator
Calculate velocity two ways. Find average velocity from displacement and time, or final velocity from initial velocity, acceleration, and time. See results in m/s, km/h, and mph.
Open toolWavelength Calculator
Calculate wavelength from frequency and wave speed, or find frequency from wavelength. Supports light, sound, and custom waves with instant results in meters, nanometers, and hertz.
Open toolPrime Number Checker
Check whether any whole number is prime. Enter a number and see the verdict, its smallest factor, the full prime factorization, and the nearest primes above and below it.
Open toolSurface Area Calculator
Find the surface area of a cube, cuboid, sphere, cylinder, or cone. A cube with 3 inch sides has a surface area of 54 square inches. Pick a shape and enter its dimensions.
Open toolAcceleration Calculator
Calculate acceleration from initial velocity, final velocity, and time. Get results in m/s squared plus distance traveled and g-force. Free, no signup.
Open toolPercent Yield Calculator
Calculate percent yield from actual and theoretical yield, or solve for any missing value. Get instant results for chemistry lab work.
Open toolSpecific Heat Calculator
Calculate heat energy, mass, specific heat capacity, or temperature change using Q = mc delta T. Solve for any missing value with worked examples.
Open toolTriangle Height Calculator
Find the height, base, or area of a triangle using the formula area = 1/2 x base x height. Enter any two values and get the third instantly.
Open toolTriangular Prism Volume Calculator
Calculate the volume of a triangular prism from base edge, triangle height, and prism length. Volume = 1/2 x base edge x triangle height x prism length.
Open toolDensity Calculator
Calculate density, mass, or volume from any two known values using the formula density = mass / volume. Enter mass and volume to find density, or any two of the three.
Open toolNet Ionic Equation Calculator
Find the net ionic equation for common precipitation reactions. Select two aqueous compounds and see the molecular, total ionic, and net ionic equation with spectator ions.
Open toolFlow Rate Calculator
Calculate flow rate, volume, or time from any two known values. Flow rate = volume / time. Enter volume and time to find the rate, or any two of the three values.
Open toolOctagon Calculator
Calculate the area, perimeter, apothem, and circumradius of a regular octagon from its side length. Area ≈ 4.828 × side² for a regular octagon.
Open toolDegrees of Freedom Calculator
Calculate degrees of freedom for a one-sample t test, two-sample t test, Welch's t test, chi-square test, or one-way ANOVA. Pick a test type and get an instant df.
Open toolDice Probability Calculator
Find the odds of rolling a specific dice total. 2d6 exactly 7 hits 16.67% of the time. Works for any dice count, sides, and exactly, at-least, or at-most target.
Open toolPerimeter Calculator
Calculate the perimeter of a square, rectangle, triangle, circle, or regular polygon. Pick a shape, enter the side lengths, and get the exact perimeter with a formula breakdown.
Open toolPie Chart Calculator
Turn category values into pie chart slices. Enter values like 30, 45, 25 and get each slice's percentage and exact angle in degrees.
Open toolTriangular Pyramid Volume Calculator
Find the volume of a tetrahedron from a triangular base and height, or from one edge of a regular tetrahedron. Two modes, worked examples, formulas.
Open toolInverse Cosine Calculator (Arccos)
Calculate cos inverse (arccos) of a ratio between -1 and 1. Arccos of 0.5 is 60 degrees, arccos of 0 is 90 degrees. Results in degrees and radians.
Open toolPercent to Goal Calculator
Calculate percent of goal reached from a current value and a target. Raising $3,750 toward $5,000 is 75%, with $1,250 left.
Open toolSum of Series Calculator
Calculate the sum of an arithmetic or geometric series. Enter the first term, number of terms, and common difference or ratio for an instant total.
Open toolGreater Than Less Than Calculator
Compare two numbers instantly and see whether the first is greater than, less than, or equal to the second, with the correct symbol shown.
Open toolD20 Dice Roller
Roll a d20 online, plus any number of dice with an optional modifier. See each roll, the sum, the total, and the average for tabletop games and math practice.
Open toolDiamond Problem Solver
Solve the algebra diamond problem in both directions. Enter two factors to get the product and sum, or enter a product and sum to find the two numbers that multiply and add to them.
Open toolT-Test Calculator
Run a one-sample, two-sample pooled, or Welch t-test from summary statistics. Get the t statistic, degrees of freedom, and two-tailed p-value with a plain-language significance note at alpha 0.05.
Open toolFeatured Tools
Scientific Calculator
Evaluate arithmetic expressions with decimals, parentheses, and percentages using this online scientific calculator for quick homework, shopping, and everyday math.
FeaturedSum of Series Calculator
Calculate the sum of an arithmetic or geometric series. Enter the first term, number of terms, and common difference or ratio for an instant total.
FeaturedGreater Than Less Than Calculator
Compare two numbers instantly and see whether the first is greater than, less than, or equal to the second, with the correct symbol shown.
Grouped by Topic
Math tools should make the reasoning easier to follow, not hide it. A good calculator helps you confirm the formula, see the role of each input, and notice when a unit or sign is wrong before you submit the answer. That matters in school because the right method is often just as important as the final number. It also matters outside school because many everyday tasks still depend on percentages, averages, geometry, and conversions. Use these tools to check work, move faster through repetition, and build confidence on the steps that keep showing up across subjects.