Health & Fitness Calculators — BMI, Calories & TDEE

22 live calculators · free, instant & private

Fitness & Body

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 →

Browse all 12 fitness & body calculators →

Pregnancy & Fertility

Pregnancy calculatorHow far along you are — weeks, trimester and key dates from your LMP or due date.Open calculator →Due Date calculatorEstimated due date from last period, conception day or IVF transfer.Open calculator →Pregnancy Weight Gain calculatorHealthy gain range for your week, from official IOM guidelines.Open calculator →Ovulation calculatorFertile window, ovulation day and your next three cycles.Open calculator →Conception calculatorWhen conception likely happened, from a due date or birth date.Open calculator →Period calculatorForecast your next six periods, ovulation days and fertile windows.Open calculator →

Browse all 8 pregnancy & fertility calculators →

More health tools

Sleep calculatorFree, instant and private — runs entirely in your browser.Open calculator →Blood Sugar Convertermg/dL to mmol/L, and A1C between NGSP %, IFCC mmol/mol and average glucose.Open calculator →
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About these calculators

Health numbers are personal — which is why these calculators run entirely in your browser and never transmit what you enter. Each one uses published, citable formulas: the BMI calculator pairs the WHO index with a Deurenberg body-fat estimate, and the calorie calculator uses the Mifflin-St Jeor equation with honest activity levels and safety floors on aggressive deficits.

One important note: these tools are educational, not medical advice. They're population formulas — great for tracking trends and setting starting targets, but they don't know your history. For decisions about your health, especially with existing conditions, during pregnancy or for anyone under 18, talk to a clinician or registered dietitian.

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

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