Calculates Basal Metabolic Rate using the Mifflin-St Jeor equation with age, sex, height, and weight. Nutritionists use it for diet planning. Everything runs locally in your browser — nothing is uploaded.
Calculate heart rate training zones by age. Find your target heart rate ranges for different exercise intensity levels. Everything runs locally in your browser — nothing is uploaded.
Calculate your ideal body weight using Devine and Robinson formulas. Provides a healthy weight range for your height and gender. Everything runs locally in your browser — nothing is uploaded.
Estimate baby growth percentiles from weight, height, and age. Monitor your childs growth compared to population averages. Everything runs locally in your browser — nothing is uploaded.
Conversion Rate Calculator divides conversions by total visitors and displays the rate as a percentage with configurable decimal precision. Everything runs locally in your browser — nothing is uploaded.
Calculate exact age in years, months, and days from a date of birth in DD/MM/YYYY format. Includes eligibility check for Indian government age requirements.
Basal Metabolic Rate — calories your body burns at complete rest in 24h. Example: a 30-year-old man, 178cm, 75kg → ≈1,730 kcal/day. Everything above that (movement, digestion, exercise) adds on top.
Mifflin-St Jeor (men: 10w + 6.25h − 5a + 5; women: −161 instead of +5) validates better against modern calorimetry, underestimating less for overweight users. This tool uses Mifflin-St Jeor.
Never eat at BMR long-term — that is starvation level. Multiply BMR by activity (sedentary 1.2 … very active 1.9) to get TDEE, then subtract 300–500 kcal for fat loss. Use the calorie calculator for the full chain.
Yes, ~6 kcal/lb/day vs ~2 for fat — but the effect is modest: 5kg of extra muscle adds roughly 60–70 kcal/day. Strength training matters more for the calories it burns directly.
No. All calculations run locally in your browser. No health data is transmitted or stored.
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) from BMR and activity level. Find how many calories you burn per day.
Daily Calorie Needs
Calculate your daily calorie needs using BMR and activity level. Shows maintenance, cutting, and bulking calorie targets for fitness planning. Everything runs locally in your browser — nothing is uploaded.