Fitness & Health Calculators

All fitness & health tools

Free calculators and self-assessments to track your body, fitness level, sleep, and everyday health metrics — no sign-up required.

How Fit Are You, Really?

A free 2-minute self-assessment scoring your cardio, strength, flexibility and lifestyle habits.

BMI Calculator

Work out your Body Mass Index, healthy weight range, BMI Prime, and Ponderal Index in seconds.

BMR & Calorie Calculator

Find your Basal Metabolic Rate and Total Daily Energy Expenditure, plus daily calorie targets for your goal.

Sleep Calculator

Find the best time to go to bed or wake up based on 90-minute sleep cycles.

Age Calculator

Calculate your exact age in years, months, days, hours, minutes, and seconds from your date of birth.

Days Until My Birthday

Count down to your next birthday down to the day and hour, plus your zodiac sign and days alive.

Age Calculator (Alt)

Determine the age or interval between two dates, shown in years, months, weeks, days, and hours.

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