Health & Fitness
Free health & fitness calculators — BMR, calorie, body fat, water intake, heart rate, pace, due dates, ovulation.
All Health & Fitness (13)
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 your daily protein, carb, and fat targets from your body stats, activity level, goal, and diet style — with a clear macro split donut, instantly and in-browser.
Calculate MacrosOne Rep Max Calculator
Estimate your one-rep max (1RM) from any working set using six proven strength formulas, then get a full training-percentage table to program your lifts — instantly and in-browser.
Estimate 1RMOvulation Calculator
Estimate your fertile window, ovulation day, next period, and an estimated due date from your last period and average cycle length — an educational calendar estimate, in-browser.
Estimate Fertile DaysPregnancy Due Date Calculator
Estimate your due date, current week, trimester, and key pregnancy milestones from your last period or conception date — instantly and in-browser. Informational only, not medical advice.
Calculate Due DateRun Pace Calculator
Calculate running pace from finish time, or predict finish time from pace. Supports km and miles. Includes projected splits for 5K, 10K, half-marathon, and marathon. Informational only.
Calculate PaceSleep Cycle Calculator
Find the best time to wake up or go to bed based on 90-minute REM sleep cycles — choose a bedtime and get 3 optimal wake times, or reverse it.
Calculate Sleep TimeVO2 Max Estimator
Estimate your VO2 max from resting heart rate or a Cooper 12-minute run — with a fitness rating for your age and gender. Informational fitness estimate, not medical advice.
Estimate VO2 MaxWater Intake Calculator
Calculate your daily water intake recommendation based on weight, gender, activity level, climate, pregnancy, and breastfeeding.
Calculate My IntakeSuggest a Tool
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