Free wellness calculators

Quick answers. Useful context.

Choose a calculator, enter a few details and get an instant estimate. Your inputs stay in your browser.

BMI Calculator

Calculate adult body mass index in metric or imperial units and understand what the result can—and cannot—tell you.

Get a practical daily hydration starting point based on body weight, activity and climate.

Estimate daily energy needs using the Mifflin–St Jeor equation and your usual activity level.

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The numbers you enter in these calculators are processed on your device. VitaAlive records only that a tool was used—not the values entered.