Skip to content
Calculator Collection

Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Fitness

BMI Calculator

Calculate Body Mass Index (BMI) — body weight in kg divided by height in metres squared — to screen for under/overweight categories. The most widely used population-level fitness and health risk metric, with known limitations for athletes and unusual body compositions.

Underweight<18.5Normal18.5–25Overweight25–30Obese I30–35Obese II+35+
Fitness

Calories Burned Running Calculator

Estimate calories burned during a run from body weight, duration, and average speed. A quick first-pass for runners tracking energy expenditure; uses a simplified linear formula rather than full MET-based equations.

Key differences

BMI CalculatorCalories Burned Running Calculator
CategoryFitnessFitness
Inputs required23
ResultYour BMICalories Burned (kcal)
What it doesCalculate Body Mass Index (BMI) — body weight in kg divided by height in metres squared — to screen for under/overweight categories. The most widely used population-level fitness and health risk metric, with known limitations for athletes and unusual body compositions.Estimate calories burned during a run from body weight, duration, and average speed. A quick first-pass for runners tracking energy expenditure; uses a simplified linear formula rather than full MET-based equations.