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 your weight stays the same. Unlike BMR, which only measures calories burned at complete rest, TDEE captures everything — your resting metabolism, the thermic effect of digesting food, your formal exercise sessions, and all the incidental movement throughout your day including walking, standing, and fidgeting, which are 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 calorie per day deficit for slow, sustainable fat loss; a moderate 500 calorie per day deficit for approximately 1 lb per week fat loss; an aggressive 750 calorie per day deficit for faster cutting; and 250 to 500 calorie surpluses for lean muscle building. TDEE is the foundation of every legitimate nutrition approach — IIFYM, flexible dieting, ketogenic dieting, intermittent fasting, reverse dieting, and contest prep all begin with an accurate TDEE estimate. Understanding your TDEE demystifies weight management: it explains why you gained weight over the past five years even though nothing felt different (TDEE declines with age and muscle loss), why your old diet stopped working (TDEE fell as you lost weight, eliminating your deficit), and why some weeks the scale does not move despite perfect adherence (water retention masking fat loss). For people in the USA, Canada, UK, Australia, and New Zealand who are serious about managing their weight and body composition, knowing TDEE is non-negotiable. Compatible with both metric (kg/cm) and imperial (lbs/inches) inputs. This tool provides an estimate — individual variation means your true TDEE may differ by up to 10 to 15 percent. Use scale weight trends over 2 to 3 weeks to calibrate your actual TDEE from real-world data.

How It Works

Step 1 — Calculate BMR using Mifflin-St Jeor: Men: BMR = (10 x weight kg) + (6.25 x height cm) minus (5 x age) + 5. Women: BMR = (10 x weight kg) + (6.25 x height cm) minus (5 x age) minus 161. Step 2 — Multiply by activity multiplier: Sedentary (office job, no formal exercise) = BMR x 1.2. Lightly Active (1 to 3 light workouts per week) = BMR x 1.375. Moderately Active (3 to 5 moderate workouts per week) = BMR x 1.55. Very Active (6 to 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 minus 140 + 5 = 1,777.5 calories at rest. TDEE = 1,777.5 x 1.55 = 2,755 calories per day for maintenance. Fat loss target at 500 calorie deficit: 2,755 minus 500 = 2,255 calories per day. Muscle building target at 300 calorie surplus: 2,755 + 300 = 3,055 calories per day. Importantly, TDEE decreases as body weight decreases — a key reason why fat loss plateaus occur. Recalculate every 10 to 15 lbs during an extended cut or after significant weight changes to ensure your calorie target still creates a real deficit.

Tips & Best Practices

• ✓TDEE decreases as you lose weight — a common reason for diet plateaus is continuing to eat at a calorie level that was an effective deficit months ago but now equals your new, lower maintenance. Recalculate every 10 to 15 lbs lost and adjust your target downward accordingly to maintain the deficit.
• ✓The activity multiplier is the most commonly overestimated input. Most desk workers who exercise 3 to 4 times per week are Lightly Active at a multiplier of 1.375, not Moderately Active. Overestimating activity by even one level adds 300 to 400 phantom calories to your calculated TDEE, leading to what feels like mystery diet failure.
• ✓NEAT variation explains why some people seem to eat anything without gaining weight: spontaneous physical activity differences such as fidgeting, pacing, and standing can account for 300 to 700 calories per day between individuals of similar size. Highly active daily movement outside the gym is a powerful, sustainable calorie-burning strategy.
• ✓Adaptive thermogenesis: in a sustained calorie deficit, your body reduces TDEE by 5 to 15 percent through hormonal changes and reduced unconscious movement. This metabolic adaptation is why the last 10 lbs of a cut is always harder than the first 10 — your body is actively defending against further weight loss.
• ✓Diet breaks — eating at full TDEE for 1 to 2 weeks during a prolonged cut — partially reverse metabolic adaptation, restore leptin levels toward normal, and dramatically improve the psychological sustainability of the overall diet period. Research shows planned diet breaks improve long-term outcomes.
• ✓Muscle mass raises TDEE: each pound of muscle burns approximately 6 to 10 calories per day at rest. Building 10 lbs of muscle increases daily TDEE by 60 to 100 calories — meaningful across years of consistent resistance training and one reason body recomposition is a superior long-term strategy.
• ✓Cutting more than 20 percent below TDEE significantly increases the risk of muscle loss, hormonal disruption, and nutrient deficiencies, especially without adequate protein intake and resistance training. Most evidence-based coaches recommend deficits of 10 to 20 percent of TDEE as the appropriate range for sustainable fat loss.
• ✓Athletes in heavy training blocks may have TDEE multipliers of 1.9 to 2.2 or higher. Chronic under-fuelling relative to TDEE in sport leads to Relative Energy Deficiency in Sport (RED-S), causing hormonal disruption, stress fractures, immune suppression, and performance decline — a serious condition recognised by the International Olympic Committee.

Who Uses This Calculator

Bodybuilders and physique athletes use TDEE as the cornerstone of every training phase: precise calorie cuts below TDEE during competition prep, eating at TDEE during maintenance phases, and controlled surpluses during lean bulking cycles. Personal trainers and online coaches calculate client TDEE as the first action in any nutrition coaching engagement, then refine the estimate based on 2 to 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 for conditions including type 2 diabetes and cardiovascular disease. People who have experienced multiple failed diets use TDEE to understand why — often discovering they were eating too close to TDEE to produce meaningful fat loss, or so far below it that muscle loss and metabolic adaptation undermined their results. Athletes in weight-class sports such as boxing, wrestling, powerlifting, and martial arts use TDEE to plan controlled weight cuts that minimise muscle and performance loss while reaching competition weight. Parents and healthcare providers use TDEE calculations for adolescent athletes to ensure adequate fuelling during growth phases where chronic under-eating can permanently compromise development. Office workers discovering that their TDEE is lower than expected often make the important realisation that physical activity outside formal exercise — daily step count, active commuting, standing desks — contributes far more to long-term weight management than gym sessions alone.