Fitness & Body Calculators

12 live calculators · free, instant & private
BMI calculatorFree, instant and private — runs entirely in your browser.Open calculator →Calorie calculatorFree, instant and private — runs entirely in your browser.Open calculator →TDEE CalculatorDaily burn from three BMR formulas, with goal calories and a macro split.Open calculator →Body Fat CalculatorUS Navy tape method and BMI estimate, with fat mass and lean mass.Open calculator →Ideal Weight CalculatorFive formulas side by side, plus your healthy BMI weight range.Open calculator →Macro calculatorFree, instant and private — runs entirely in your browser.Open calculator →Water Intake CalculatorAdjusted for exercise, climate and life stage — in litres, cups and bottles.Open calculator →Heart Rate Zone CalculatorFive training zones in bpm by Karvonen or %HRmax, four max-HR formulas.Open calculator →Running Pace CalculatorPace, time or distance, with split tables and equivalent race times.Open calculator →BMR calculatorFree, instant and private — runs entirely in your browser.Open calculator →Calories Burned calculator60+ activities by MET value, weight and timeOpen calculator →One Rep Max calculator1RM from any set plus training percentage tableOpen calculator →
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Related health calculators

From the other health sub-categories — same engine, same privacy.

Pregnancy calculatorHow far along you are — weeks, trimester and key dates from your LMP or due date.Pregnancy & Fertility →Sleep calculatorFree, instant and private — runs entirely in your browser.Health →Due Date calculatorEstimated due date from last period, conception day or IVF transfer.Pregnancy & Fertility →Blood Sugar Convertermg/dL to mmol/L, and A1C between NGSP %, IFCC mmol/mol and average glucose.Health →Pregnancy Weight Gain calculatorHealthy gain range for your week, from official IOM guidelines.Pregnancy & Fertility →Ovulation calculatorFertile window, ovulation day and your next three cycles.Pregnancy & Fertility →

Guides for fitness & body

Worked examples and the reasoning behind these calculators. Browse all guides →

ConversionHow Many Miles Is a 10K?Aug 28, 2026 · 5 min readHealthHow Many Calories Should You Eat to Lose Weight?Aug 14, 2026 · 4 min readHealthWhat Time Should I Go to Bed?Aug 12, 2026 · 5 min readHealthWhat's a Healthy BMI — and What the Number MissesAug 11, 2026 · 4 min readHealthHow Much Weight Should You Gain During Pregnancy?Aug 5, 2026 · 5 min readHealthHow Much Water Should I Drink a Day?Jul 28, 2026 · 6 min read

About these calculators

Body metrics are estimates, and the honest ones say so. These calculators use published formulas — Mifflin-St Jeor for BMR, activity multipliers for daily energy needs — and show which formula produced your number so you can judge it rather than just receive it.

BMI in particular is a population screening tool, not a diagnosis: it cannot distinguish muscle from fat, and the calculator says as much alongside the result. The macro calculator splits a calorie target into protein, carbohydrate and fat by gram and by percentage. For anything that affects how you eat or train long term, talk to a doctor or a registered dietitian.

More from ListCalc

Every category, same promise: runs in your browser, shows its math, never sees your numbers.

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