Health & Fitness
Free health & fitness calculators — BMR, calorie, body fat, water intake, heart rate, pace, due dates, ovulation.
All Health & Fitness (12)
Explore our collection of free health & fitness
Alcohol Units Calculator
Calculate UK alcohol units across multiple drinks, see grams of ethanol, and compare against the 14-units-per-week low-risk guideline.
Calculate UnitsBlood Alcohol Calculator
Estimate your Blood Alcohol Concentration (BAC) from drinks, body weight, sex, and time using the Widmark formula.
Estimate BACCalories Burned
Estimate calories burned for any activity — running, cycling, swimming, yoga, gym — from your weight and workout time.
Calculate BurnFitness Age Calculator
Estimate your fitness age from VO₂ max relative to your chronological age, with a category rating and tips to improve.
Calculate Fitness AgeHeart Rate Zones
Calculate your five training heart-rate zones from age and resting heart rate, using the Tanaka, Fox, or Karvonen methods — instant and fully in-browser.
Calculate ZonesMacro Calculator
Calculate daily protein, carbs, and fat targets from goals and activity level.
Use ToolOne Rep Max Calculator
Estimate your 1RM (one-rep max) from any working set using 7 formulas.
Use ToolOvulation Calculator
Estimate ovulation window and fertile days from menstrual cycle data.
Use ToolPregnancy Due Date
Calculate due date and trimester from last menstrual period or conception date.
Use ToolRun Pace Calculator
Calculate pace, time, or distance — convert between min/km and min/mile.
Use ToolVO2 Max Estimator
Estimate VO2 max from resting heart rate, age, and gender. Cooper test included.
Use ToolWater Intake Calculator
Calculate daily water intake — weight, climate, and activity factored in.
Use ToolSuggest a Tool
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