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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+
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Fitness

Body Water Percentage Calculator

Estimate body water percentage using a simple age-, gender-, and weight-adjusted formula. Use it as a rough wellness indicator alongside BMI and body fat percentage — accurate measurement requires bioelectrical impedance analysis (BIA) or DEXA scans.

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Key differences

BMI CalculatorBody Water Percentage Calculator
CategoryFitnessFitness
Inputs required23
ResultYour BMIBody Water (kg)
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 body water percentage using a simple age-, gender-, and weight-adjusted formula. Use it as a rough wellness indicator alongside BMI and body fat percentage — accurate measurement requires bioelectrical impedance analysis (BIA) or DEXA scans.