Health & fitness calculators

Free health & fitness calculators with formulas shown on every page.

• BMI calculatorWHO and Asian cutoffs, side by side.
• BMR calculatorMifflin–St Jeor, the usual clinical estimate.
• Tdee calculatorMaintenance calories plus protein/carb/fat split.
• Whr calculatorA simple central-obesity marker.
• Body Fat calculatorNavy girth, or Deurenberg from BMI and age.
• Pregnancy calculatorLMP + 280 days (Naegele).
• Steps To Miles calculatorStride from height.
• Walk A Mile calculatorTime, calories and steps from mph, plus a full pace table.
• Kj Calories calculatorNutrition-label conversion.
• Sober calculatorTime since a quit date.
• Water Intake calculatorA starting point from body mass and activity.
• Sleep Cycle calculatorWake times on 90-minute cycles.
• Pace calculatorDistance and time → pace.
• Race Predictor calculatorRiegel: predict another distance from a known race.
• One Rep Max calculatorEpley: 1RM = w × (1 + reps/30).
• Protein calculatorGrams from a goal band.
• Heat Index calculatorTemperature + humidity → how hot it feels.
• Wind Chill calculatorCold + wind → how cold it feels.
• Ten Thousand Steps calculator10,000 steps in miles and km from height.
• Steps In A Mile calculatorSteps in a mile from height.
• Calories Walking calculatorkcal/mile ≈ 1.17 × kg. A heuristic, not a lab.
• Calories Running calculatorkcal/mile ≈ 1.65 × kg.
• Ideal Weight calculatorDevine formula: height → reference kg.
• Ovulation calculatorLMP + cycle → ovulation and fertile days.
• Conception Date calculatorLMP, conception, or transfer — three dating sketches.