27 free tools
Health calculators
Estimate useful wellness targets with simple, transparent formulas. Every tool includes its formula, an example, and instant private results.
BMI Calculator
Calculate adult body mass index and its standard weight-status category from height and weight.
Open calculatorCalorie Calculator
Estimate daily calorie needs from age, sex, height, weight, and activity level using the Mifflin–St Jeor equation.
Open calculatorBody Fat Calculator
Estimate body fat percentage with the U.S. Navy circumference method.
Open calculatorIdeal Weight Calculator
Estimate an adult reference weight range from height using the Devine formula and healthy BMI bounds.
Open calculatorWater Intake Calculator
Estimate a practical daily water target based on body weight and exercise time.
Open calculatorBMR Calculator
Estimate basal metabolic rate from age, sex, weight, and height.
Open calculatorTDEE Calculator
Find daily calorie needs based on activity level and body stats.
Open calculatorLean Body Mass Calculator
Estimate lean mass from body weight and body fat percentage.
Open calculatorBody Surface Area Calculator
Calculate body surface area for clinical dosing and fitness metrics.
Open calculatorWaist-to-Hip Ratio Calculator
Assess waist-to-hip ratio as a simple body composition indicator.
Open calculatorProtein Intake Calculator
Set a daily protein target based on weight and fitness goal.
Open calculatorCarb Intake Calculator
Estimate daily carbohydrate needs from calories and macro split.
Open calculatorFat Intake Calculator
Estimate daily fat intake from calories and macro targets.
Open calculatorMacro Calculator
Split daily calories into protein, carbs, and fat for your goal.
Open calculatorPregnancy Due Date Calculator
Estimate due date from last menstrual period or conception date.
Open calculatorOvulation Calculator
Predict fertile window timing from cycle length and start date.
Open calculatorPregnancy Weight Gain Calculator
Track recommended pregnancy weight gain by trimester and BMI.
Open calculatorBlood Alcohol Calculator
Estimate blood alcohol level from drinks, weight, and elapsed time.
Open calculatorBAC Time Calculator
Estimate how long until blood alcohol returns to zero.
Open calculatorHeart Rate Calculator
Find resting, max, and training heart rate zones by age.
Open calculatorTarget Heart Rate Calculator
Set target heart rate zones for cardio training intensity.
Open calculatorOne Rep Max Calculator
Estimate your one-rep max from weight lifted and reps completed.
Open calculatorRunning Calories Calculator
Estimate calories burned running from distance, pace, and weight.
Open calculatorWalking Calories Calculator
Estimate calories burned walking from distance, time, and weight.
Open calculatorCycling Calories Calculator
Estimate calories burned cycling from distance, time, and intensity.
Open calculatorSwimming Calories Calculator
Estimate calories burned swimming from duration, stroke, and weight.
Open calculatorSleep Calculator
Find ideal bedtimes or wake times aligned to 90-minute sleep cycles.
Open calculatorAbout our health calculators
CalculatorDepot tools are designed for quick estimates and learning. Inputs stay in your browser, and each page describes the equation behind its result. Check important decisions with a qualified professional when individual circumstances, regulations, or fees matter.