Calculate your daily calorie needs from BMR (Mifflin-St Jeor) times activity level. Shows basal burn plus maintenance calories for fitness planning. Health data never leaves your device — every calculation runs locally in your browser.
Content reviewed October 2026 · About Toolzum
Calculates Basal Metabolic Rate using the Mifflin-St Jeor equation with age, sex, height, and weight. Nutritionists use it for diet planning. Health data never leaves your device — every calculation runs locally in your browser.
Calculate your Total Daily Energy Expenditure (TDEE) from BMR and activity level. Find how many calories you burn per day.
Calculate body fat percentage using the US Navy circumference method. Enter waist, neck, height, and hip measurements. Health data never leaves your device — every calculation runs locally in your browser.
Calculate customer churn rate by dividing customers lost by total customers. Monitor retention health for your subscription business. Numbers never leave your device — every calculation runs locally in your browser.
Calculate savings and final price after a percentage discount. Perfect for shopping, sales, and budget planning. Figures never leave your device — every calculation runs locally in your browser.
BMR (Basal Metabolic Rate) is calculated using the Mifflin-St Jeor equation: for men (10 × weight + 6.25 × height - 5 × age + 5), for women (10 × weight + 6.25 × height - 5 × age - 161).
Sedentary (office job), lightly active (1-3 days exercise), moderately active (3-5 days), very active (6-7 days), and extra active (physical job + daily exercise).
Maintenance = calories to maintain current weight. Cutting = 500 calorie deficit for fat loss (~0.5 kg/week). Bulking = 300-500 surplus for muscle gain.
No — it uses weight, height, age, and gender only, so very muscular or very lean builds get rougher numbers. For goal calories with deficit and surplus bands, use the TDEE calorie calculator. Defaults (male, 70 kg, 170 cm, 30, moderate) give BMR ≈1,618 and maintenance ≈2,507 kcal/day.
No. All calculations run locally in your browser. No health data is transmitted.
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) from BMR and activity level. Find how many calories you burn per day.
Macro Calculator
Compute daily protein, carb, and fat macro targets from calories and your own percentage split. Turn any diet into gram numbers — free, local, informational only.