All Calculators

Free Health & Fitness Calculators

18 free calculators — instant results, no signup required.

📊 Body Composition

Calculate your Body Mass Index instantly. Free BMI calculator for…

Estimate your body fat percentage using the US Navy circumference…

Calculate your Waist-to-Hip Ratio (WHR) — a key predictor of card…

Calculate your ideal body weight using the Devine formula — the m…

Estimate your metabolic age — how old your metabolism is compared…

🔥 Calorie & Nutrition

Calculate your Total Daily Energy Expenditure (TDEE) — the exact …

Find your Basal Metabolic Rate — the calories your body burns at …

Calculate your ideal daily macros — protein, carbohydrates, and f…

Calorie Deficit

Calculate your daily calorie deficit for weight loss and get an e…

Calculate your personalised daily water intake based on weight, a…

Calculate your ideal ketogenic diet macros — net carbs, protein, …

⏱️ Lifestyle

Plan your intermittent fasting schedule. Choose from 16:8, 18:6, …

Sleep Calculator

Calculate the best time to go to sleep or wake up based on 90-min…

Estimate your biological age based on lifestyle factors, sleep, e…

🌸 Womens Health

Calculate your pregnancy due date (EDD) from your last menstrual …

Calculate your ovulation date and fertile window. Know your most …

💪 Fitness

Calculate your one-rep max (1RM) for any lift using weight and re…

Heart Rate Zones

Calculate your 5 personalised heart rate training zones based on …

Evidence-Based Health Calculators

Every formula on MyFitCalculator is grounded in peer-reviewed research. The BMI calculator uses WHO classifications. BMR and TDEE use the Mifflin-St Jeor equation — validated as the most accurate formula for the general population. The body fat calculator uses the validated US Navy circumference method. Every calculation is explained transparently on its page.

Medical Disclaimer

Results are for informational purposes only and do not constitute medical advice. Always consult a qualified health professional before making changes to your diet, exercise programme, or health management plan.