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Fitness Calculators

Local fitness estimates for body measurements, energy needs, exercise, and performance.

Browse Fitness Calculators

BMI CalculatorCalculate adult body mass index from metric or imperial height and weight measurements.Calorie CalculatorEstimate daily calorie needs from age, measurements, activity, and goals.Body Fat CalculatorEstimate body-fat percentage using circumference measurements.BMR CalculatorEstimate basal metabolic rate with the Mifflin–St Jeor equation.Ideal Weight CalculatorCalculate a historical reference-weight estimate from height.Pace CalculatorCalculate average exercise pace and speed from distance and time.Army Body Fat CalculatorEstimate U.S. Army one-site circumference body fat for men and women.Lean Body Mass CalculatorEstimate lean body mass using the Boer equations.Healthy Weight CalculatorFind the adult weight range corresponding to BMI 18.5–24.9.Calories Burned CalculatorEstimate activity energy use from MET, body weight, and duration.One Rep Max CalculatorEstimate a one-repetition maximum from a submaximal set.Target Heart Rate CalculatorEstimate an exercise heart-rate range from age and resting pulse.

Start here: practical tutorial

Use body and activity estimates with the right context

Measure consistently, select the displayed units, read the equation and population assumptions, and focus on trends rather than treating one number as a diagnosis.

  1. Choose the tool matching the input you have and the result you need.
  2. Confirm every unit, option and assumption before running it.
  3. Review the example, limitations and output before using the result.

Worked example

BMI divides kilograms by metres squared; equal BMI values can still represent different body composition.

What this does not replace

These estimates cannot account for every condition, medication, pregnancy, disability or training goal.

Review a BMI estimate