TDEE Calculator

About the TDEE Calculator

A TDEE calculator (Total Daily Energy Expenditure calculator) tells you exactly how many calories your body burns every single day — your true maintenance calories. TDEE is the master number in nutrition: eat below it and you lose weight; eat above it and you gain; eat at it and weight stays the same. Unlike BMR (which only measures calories burned at rest), TDEE captures everything — your resting metabolism, the thermic effect of digesting food, your formal exercise, and all the incidental movement throughout your day including walking, standing, and fidgeting (collectively called NEAT: Non-Exercise Activity Thermogenesis). Our free TDEE calculator uses the Mifflin-St Jeor equation for BMR — validated as the most accurate formula for the general adult population in peer-reviewed clinical studies — then applies a precise activity multiplier to produce your full daily energy expenditure. The output includes your maintenance TDEE alongside targeted calorie levels for different goals: a mild 250 cal/day deficit for slow, sustainable fat loss; a moderate 500 cal/day deficit for approximately 1 lb/week fat loss; an aggressive 750 cal/day deficit for faster cutting; and 250-500 calorie surpluses for lean muscle building. TDEE is the foundation of every legitimate nutrition approach — IIFYM, flexible dieting, keto, intermittent fasting, reverse dieting, and contest prep all begin with an accurate TDEE estimate. Compatible with both metric (kg/cm) and imperial (lbs/inches) inputs.

How It Works

Step 1 — Calculate BMR using Mifflin-St Jeor: Men: BMR = (10 x weight kg) + (6.25 x height cm) - (5 x age) + 5. Women: BMR = (10 x weight kg) + (6.25 x height cm) - (5 x age) - 161. Step 2 — Multiply by activity multiplier: Sedentary (office job, no formal exercise) = BMR x 1.2. Lightly Active (1-3 light workouts per week) = BMR x 1.375. Moderately Active (3-5 moderate workouts per week) = BMR x 1.55. Very Active (6-7 hard workouts per week) = BMR x 1.725. Extra Active (physical labour job plus daily training) = BMR x 1.9. Example: 28-year-old male, 80 kg, 178 cm, moderately active. BMR = 800 + 1112.5 - 140 + 5 = 1,777.5. TDEE = 1,777.5 x 1.55 = 2,755 calories/day maintenance. Fat loss target: 2,755 - 500 = 2,255 calories/day. Muscle building target: 2,755 + 300 = 3,055 calories/day. TDEE decreases as body weight decreases, so recalculate every 10-15 lbs during an extended cut or after significant weight change.

Tips & Best Practices

• ✓TDEE decreases as you lose weight — a common reason for plateaus is continuing to eat at a calorie level that was a deficit months ago but is now your new maintenance. Recalculate every 10-15 lbs lost.
• ✓The activity multiplier is the most commonly overestimated input. Most desk workers who exercise 3-4 times per week are Lightly Active (1.375), not Moderately Active — overestimating this causes most "mystery" diet failures.
• ✓NEAT variation explains why some people seem to eat anything without gaining weight: spontaneous physical activity differences (fidgeting, pacing, standing) can account for 300-700 calories per day between individuals of the same size.
• ✓Adaptive thermogenesis: in a sustained calorie deficit, your body reduces TDEE by 5-15% through hormonal changes and reduced unconscious movement. This is why the last 10 lbs of a cut is always harder than the first 10.
• ✓Diet breaks: eating at TDEE for 1-2 weeks during a prolonged cut partially reverses metabolic adaptation, restores leptin levels, and dramatically improves psychological sustainability of the overall diet.
• ✓Muscle mass raises TDEE: each pound of muscle burns approximately 6-10 calories per day at rest. Building 10 lbs of muscle increases daily TDEE by 60-100 calories — meaningful over years of consistent training.
• ✓Cutting more than 20% below TDEE significantly increases the risk of muscle loss, especially without adequate protein and resistance training. Most evidence-based coaches recommend deficits of 10-20% of TDEE maximum.
• ✓Athletes in heavy training blocks may have TDEE multipliers of 1.9-2.2+. Under-fuelling relative to TDEE in sport leads to Relative Energy Deficiency in Sport (RED-S), causing hormonal disruption, stress fractures, and performance decline.

Who Uses This Calculator

Bodybuilders and physique athletes use TDEE as the cornerstone of every phase: precise calorie cuts below TDEE during competition prep, eating at TDEE during maintenance phases, and controlled surpluses during lean bulking. Personal trainers and online coaches calculate client TDEE as the first action in any nutrition coaching engagement, then calibrate based on 2-3 weeks of real-world scale weight trend data. Registered dietitians use TDEE to design evidence-based calorie prescriptions for weight management, sports performance, and medical nutrition therapy. People who have experienced multiple failed diets use TDEE to understand why — discovering they were either eating too close to TDEE to lose weight, or so far below that muscle loss and metabolic adaptation sabotaged their results. Athletes in weight-class sports (boxing, wrestling, powerlifting, martial arts) use TDEE to plan controlled weight cuts that minimise muscle and performance loss while making competition weight. Parents and healthcare providers use TDEE calculations for adolescents to ensure adequate nutrition during growth phases where under-eating can permanently compromise development.