❤️Health & Fitness
BMI, calorie, TDEE, macro, and body composition calculators.
Browse health calculators built to help with everyday tracking and planning. This category covers body measurements, nutrition estimates, fitness-related tools, and other common health calculations users often need in one place.
What You'll Find Here
This category is for users who want quick health-related estimates, including tools for body composition, calorie planning, daily energy use, weight guidance, sleep timing, and fitness pacing.
All Health & Fitness Tools
BMI 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 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 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 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 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 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 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 toolCalorie Deficit Calculator
Estimate daily calorie targets from BMR, activity level, and a selected deficit percentage with clear assumptions.
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 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 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 toolFeatured Tools
Protein Calculator
Use this protein calculator to estimate daily protein intake from body weight and fitness goal assumptions.
FeaturedOne Rep Max Calculator
Use this one rep max calculator to estimate 1RM from lifted weight and reps using the Epley formula.
FeaturedBMR Calculator
Use this BMR calculator to estimate basal metabolic rate using the Mifflin-St Jeor method based on age, sex, height, and weight.
Grouped by Topic
Health calculators are best used as practical guidance tools, not final medical conclusions. They can help users estimate patterns, compare options, and understand common formulas. The strongest health pages explain what the calculator measures, what it does not measure, and when a user may need more context beyond the number shown.