Health & Fitness Calculators

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Find a health or fitness calculator

Browse educational calculators for food-label arithmetic, body measurements, activity, reproductive dates, and clinical formulas. Results are mathematical references, not personal targets or diagnoses.

25 calculators in 5 topics

Nutrition & Energy

Energy-unit math and nutritional label calculations, without prescribed intake targets.

8 tools
Calorie CalculatorCalculate the total labeled food energy for a chosen number of servings.Open tool TDEE CalculatorLearn how a daily energy expenditure estimate changes with an assumed activity multiplier.Open tool BMR CalculatorView an illustrative adult resting-energy estimate using a published estimation formula.Open tool Macronutrient CalculatorFind the energy equivalent of entered protein, carbohydrate and fat amounts.Open tool Protein CalculatorCalculate the total grams of protein from a per-serving label and servings.Open tool Carbohydrate CalculatorCalculate the total grams of carbohydrate from a per-serving label and servings.Open tool Fat Intake CalculatorCalculate the total grams of fat from a per-serving label and servings.Open tool Kilojoules to Calories ConverterConvert food-energy values between kilojoules and kilocalories in either direction.Open tool

Body Measurements & References

Numerical measurement references, with important limits on interpretation.

6 tools
BMI CalculatorCalculate an adult BMI number from mass and height, without assigning body-worth labels.Open tool Body Fat CalculatorCalculate the percentage represented by an entered fat-mass measurement.Open tool Lean Body Mass CalculatorSubtract a measured fat-mass figure from the total to find the remaining mass.Open tool Army Body Fat CalculatorRead an educational overview of circumference-based body-composition estimation.Open tool Waist-to-Hip Ratio CalculatorFind the numerical waist-to-hip ratio from two measurements in the same unit.Open tool Body Surface Area CalculatorEstimate body surface area from height and mass using the Mosteller equation.Open tool

Movement & Activity

Distance, pace and simple activity calculations with adjustable assumptions.

5 tools
Steps & Distance ConverterConvert between steps, kilometers, and miles using a chosen average step length.Open tool Pace CalculatorCalculate speed, elapsed time, and average pace from a distance and duration.Open tool Walk a Mile Time CalculatorEstimate the time needed to walk one mile using a speed you enter.Open tool Heart Rate Reference CalculatorExplore a simple age-based heart-rate arithmetic model for adults.Open tool One Rep Max CalculatorView a mathematical estimate of one-repetition equivalent from a recorded lift.Open tool

Pregnancy & Cycle Dates

Educational date estimates that cannot confirm clinical findings.

5 tools
Pregnancy Timeline CalculatorEstimate elapsed weeks in a pregnancy timeline from a last menstrual period date.Open tool Due Date CalculatorEstimate a due date from the first day of a last menstrual period.Open tool Conception Date EstimateLearn how a rough conception-date estimate is derived from cycle dates.Open tool Period Date TrackerCalculate an estimated next cycle start from a date and a cycle-length assumption.Open tool Ovulation Date EstimateExplore a textbook cycle-date estimate and its uncertainty.Open tool

Clinical Reference

Laboratory equation explanations for adults, not clinical diagnoses.

1 tools
eGFR Calculator (CKD-EPI 2021)Estimate adult kidney filtration from laboratory serum creatinine using the 2021 CKD-EPI equation.Open tool

How to use these calculators

Select a calculator, enter the measurements or dates requested, and read the calculation method and assumptions below the result. Body measurements cannot independently determine health, and estimated cycle or clinical dates do not replace medical evaluation.