Fitness Calculators

Why track your fitness numbers?

Body composition and weight change slowly, which makes it easy to miss real progress — or real warning signs — without a consistent way to check in. The calculators in this category give you a quick, private snapshot any time you need one, without any account or app to install.

Which calculator should you use?

• BMI Calculator — a fast, general screening number based on height and weight. Good for a quick baseline, though it doesn't distinguish muscle from fat.
• Body Fat % Calculator — a more specific estimate of your body composition using the U.S. Navy circumference method, useful alongside BMI.
• Ideal Weight Calculator — a healthy weight range for your height, useful as a general target rather than a strict goal.
• Waist-to-Hip Ratio — a simple measurement that gives insight into fat distribution, which some research ties more closely to health risk than weight alone.
• Grip Strength Calculator — compares your hand dynamometer reading to published norms for your age and sex, a simple marker linked in research to overall muscle mass and long-term health.
• Running Pace Calculator — calculates your pace per km or mile, predicts your 5K, 10K, half marathon or marathon finish time, and shows a full pace chart for race-day planning.

A note on accuracy

Every tool here gives a solid estimate, not a clinical diagnosis. Factors like muscle mass, bone density, and body frame can shift results — for anything related to a medical decision, check with a doctor or a certified professional.