Calculate Your Daily Calorie Needs
Precision tools for high-performance fitness. Get your BMR and TDEE instantly using the Mifflin-St Jeor equation. No signup, no fees, just results.
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Ready to optimize your macros? Open Macro Calculator →
Ancillary Calculators
Deeper insights for specific metabolic and biometric markers.
BMI
Calculate Body Mass Index to assess weight category health.
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Split calories into optimal Protein, Carbs, and Fats.
Open Tool north_eastBody Fat
Estimation using the U.S. Navy Method measurements.
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Hydration requirements based on weight and activity.
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READ ARTICLE trending_flatCommon Questions
We use the Mifflin-St Jeor equation, which is widely considered the most accurate formula for estimating BMR in modern research studies.
Absolutely not. All calculations happen in your browser. No data ever reaches our servers, keeping your biometric info 100% private.
Our tools use metric units (kg for weight, cm for height). This ensures the highest accuracy with the Mifflin-St Jeor and Navy method formulas.
It is the distribution of your total calories into protein, carbohydrates, and fats based on your specific training goals (Cut, Bulk, or Maintain).
We recommend updating your metrics every 2-4 weeks as your weight and metabolic adaptation change during your fitness journey.
BMI is a screening tool. While helpful for populations, it doesn't account for muscle mass vs fat mass. Use our Body Fat tool for a more granular view.
BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest — just to keep organs functioning. TDEE (Total Daily Energy Expenditure) multiplies your BMR by an activity factor that accounts for your daily movement, exercise, and lifestyle. Your TDEE is the number you should use when setting calorie targets for weight loss or muscle gain. The Mifflin-St Jeor study (1990) demonstrated this equation to be the most reliable predictor of BMR in healthy adults.
A safe and sustainable calorie deficit is generally 300–500 kcal below your TDEE, which targets roughly 0.3–0.5 kg of fat loss per week. Larger deficits (above 750 kcal) risk muscle loss and hormonal disruption. Use our calorie calculator to find your TDEE, then subtract your chosen deficit amount. Pair it with the Macro Calculator to ensure your protein intake stays high enough to preserve lean muscle during the cut.
Yes. Even mild dehydration of 1–2% body weight reduces aerobic performance, increases perceived exertion, and impairs thermoregulation — all of which can skew calorie burn estimates from wearables. Staying adequately hydrated also supports nutrient transport and protein synthesis. Use our Water Intake Calculator to get a personalised daily hydration target based on your weight and activity level.