How to Calculate Your TDEE (Total Daily Energy Expenditure)
TDEE is your basal metabolic rate multiplied by an activity factor that estimates how much energy you burn across a normal day. If you want the number fast, use the OnSumo BMR/TDEE Calculator, then use the steps below to understand what the result means. TDEE matters because it gives you a starting calorie target. If the estimate is off, you can still adjust from your weight trend, but the formula beats picking a random calorie goal. Formula Verification The Mifflin-St Jeor equation used in this article and the OnSumo BMR/TDEE Calculator is based on the 1990 study "A New Predictive Equation for Resting Energy Expenditure in Healthy Individuals" published in The American Journal of Clinical Nutrition (PMID: 2305711). Activity multiplier ranges are sourced from CDC physical activity guidelines and NIDDK Body Weight Planner documentation.
What Is TDEE?
TDEE is the total number of calories you burn in a full day from resting metabolism, movement, and digestion. Most people hear "calories burned" and think exercise, but exercise is only one part. Total daily energy expenditure includes calories your body uses at rest, for movement, and to digest food. TDEE is more useful than BMR alone because it reflects what your body actually burns in real life, not just baseline resting needs.
What Is BMR and How Does It Differ From TDEE?
BMR is the calories your body uses at rest, while TDEE is BMR adjusted upward to reflect activity and daily living. Basal metabolic rate is the energy needed for basic functions such as breathing, circulation, and temperature regulation. It is the floor, not the full picture. If your BMR is 1,500 calories, that does not mean 1,500 calories is your maintenance intake unless you spend the entire day at complete rest. TDEE starts with BMR and then applies an activity estimate. Two people with the same age, height, weight, and sex can have different TDEE values if one sits most of the day and the other trains hard four or five times a week.
What Are the Five TDEE Activity Multipliers?
Activity multipliers are the numbers you multiply by BMR to estimate TDEE, and most calculators use five standard levels from 1.2 to 1.9. The multiplier should match your normal week, not your best week. Think in terms of average daily movement, not gym identity. If your routine is below CDC guidance (150 minutes of moderate activity per week plus 2 days of strength training), choosing a lower multiplier is usually safer than overestimating.
| Activity level | Multiplier | Typical pattern |
|---|---|---|
| Sedentary | 1.2 | Little or no planned exercise, mostly sitting |
| Lightly active | 1.375 | Light exercise 1 to 3 days per week |
| Moderately active | 1.55 | Moderate exercise 3 to 5 days per week |
| Very active | 1.725 | Hard exercise 6 to 7 days per week |
| Extra active | 1.9 | Physical job, two-a-day training, or both |
What Is the TDEE Formula?
You calculate TDEE by estimating BMR first, then multiplying that BMR by the activity factor that best matches your weekly routine. The Mifflin-St Jeor equation, published in 1990, is one of the most commonly used formulas for estimating resting energy expenditure in adults. For men: BMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age in years) + 5 For women: BMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age in years) - 161 Then: TDEE = BMR x activity multiplier Example: A 30-year-old woman, 5'6" (167.6 cm), 165 lb (74.8 kg), moderately active: - BMR = (10 x 74.8) + (6.25 x 167.6) - (5 x 30) - 161 = 1,485 - TDEE = 1,485 x 1.55 = 2,302 calories per day That number is a starting estimate. If body weight is stable across two or three weeks at roughly that intake, the estimate is probably close.
How Do You Use TDEE to Set a Calorie Target for Fat Loss or Muscle Gain?
You use TDEE as your maintenance estimate, then move calories up or down based on your goal. For maintenance, start near your TDEE and watch your weight trend. For fat loss, use a modest deficit instead of a crash cut. For muscle gain, a small surplus makes more sense than a large one because the goal is to add tissue without forcing excess fat gain.
| Goal | Starting adjustment from TDEE | What to watch |
|---|---|---|
| Maintenance | 0 calories | Weight trend stays mostly flat |
| Fat loss | -250 to -500 calories | Slow weekly loss, energy stays normal |
| Muscle gain | +150 to +300 calories | Slow gain, strength improves |
Why Calculated TDEE Often Differs From Actual Calorie Burn
Calculated TDEE often differs from actual calorie burn because formulas estimate averages, while real life changes from day to day. The biggest source of error is activity selection. People choose a multiplier based on workouts alone and forget the rest of the day. An hour in the gym does not cancel ten hours of sitting. Nonexercise activity can shift calorie burn more than people expect. Food logging adds noise. Portion estimates, restaurant meals, and weekend eating all move actual intake away from the planned number. Body weight changes also lower energy needs over time, which is why fat loss slows unless calorie targets are revisited. Use your TDEE as a starting estimate, not a final verdict. If your weight trend over 2 to 3 weeks does not match your goal, adjust intake and reassess.
Use the Calculator
Use the OnSumo BMR/TDEE Calculator to get your estimate, then track your average body weight for 2 to 3 weeks before making adjustments. If you need macro targets, the OnSumo Macro Calculator builds on the same calorie foundation.
Frequently Asked Questions
What is a normal TDEE?
Normal TDEE depends on body size, age, sex, and activity. There is no single healthy number that applies to everyone.
How accurate is TDEE?
TDEE is an estimate, not a direct measurement. It sets a starting calorie target, but real-world tracking tells you whether the estimate is close.
Should I eat at my TDEE to maintain weight?
Yes, eating near your TDEE is the standard starting point for maintenance. If your weight moves up or down over a few weeks, adjust based on results.
Does TDEE change as I lose weight?
Yes, TDEE usually falls as body weight falls because a smaller body uses less energy at rest and during movement.
What is the difference between TDEE and BMR?
BMR is your resting calorie baseline, while TDEE is your full-day estimate after activity is added.