If you have started tracking calories, you have probably met two acronyms that sound similar but mean different things: BMR and TDEE. Understanding TDEE vs BMR is the key to setting the right calorie target, because one is the floor and the other is the full picture. BMR is what your body burns just to stay alive at rest, while TDEE is everything you burn in a day once activity is added. This guide explains both clearly, shows the simple formula that turns BMR into TDEE using an activity factor, and works through an example. To get your own figures, use our BMR calculator, then read on to see how the two connect.
Quick answer: BMR (basal metabolic rate) is the calories your body burns at complete rest just to stay alive. TDEE (total daily energy expenditure) is everything you burn in a day, including activity and digestion. You get TDEE by multiplying BMR by an activity factor, so TDEE is always larger than BMR.
What is BMR?
Basal metabolic rate (BMR) is the number of calories your body needs at complete rest to keep you alive: breathing, circulating blood, maintaining temperature, and running your cells. It is the energy you would burn lying still all day, doing nothing.
BMR usually accounts for around 60 to 70% of the total calories most people burn. It is driven mainly by your size, age, sex, and muscle mass. Our guide to calculating BMR covers the formula in detail.
What is TDEE?
Total daily energy expenditure (TDEE) is the complete picture: every calorie you burn in a day. It includes your BMR plus the energy used for movement, exercise, and even digesting food.
TDEE is made up of four parts: your BMR, the calories burned during exercise, the calories burned through everyday non-exercise movement like walking and fidgeting, and the small amount used to digest food. Because it captures activity, TDEE is your true maintenance calorie level.
How BMR becomes TDEE
You turn BMR into TDEE by multiplying it by an activity factor that reflects how active you are.
TDEE = BMR x activity factor
| Activity level | Factor |
|---|---|
| Sedentary (little or no exercise) | 1.2 |
| Lightly active (1 to 3 days a week) | 1.375 |
| Moderately active (3 to 5 days a week) | 1.55 |
| Very active (6 to 7 days a week) | 1.725 |
| Extra active (physical job or twice-daily training) | 1.9 |
A worked example
Suppose your BMR is 1,600 calories and you are moderately active.
- Pick your activity factor: moderately active = 1.55.
- Multiply: 1,600 x 1.55 = 2,480 calories.
In plain English: your body burns about 1,600 calories at rest, but roughly 2,480 across a full, moderately active day. That 2,480 is your TDEE, the number you would eat to maintain your weight.
Find both numbers
Our BMR calculator gives your resting rate, and our calorie calculator applies an activity factor to reveal your TDEE. Once you have TDEE, our calorie guide shows how to adjust it for losing or gaining weight.
Which one should you use?
For everyday diet planning, TDEE is the number you want. It represents the calories you actually burn, so eating your TDEE maintains your weight, eating below it loses weight, and eating above it gains weight.
BMR is the foundation that TDEE is built on, and it is useful for understanding your baseline, but you should not eat at your BMR level, since that ignores all your daily activity and would create too large a deficit for most people. Think of BMR as the engine idling and TDEE as the engine driving.
Frequently asked questions
What is the difference between TDEE and BMR?
BMR is the calories your body burns at complete rest to stay alive, while TDEE is all the calories you burn in a full day, including activity, exercise, and digestion. TDEE equals BMR multiplied by an activity factor, so it is always higher. BMR is the baseline; TDEE is the complete daily total you use for calorie planning.
Is TDEE always higher than BMR?
Yes. Because TDEE adds the energy from movement, exercise, and digestion on top of your resting BMR, it is always larger. Even a completely sedentary person has a TDEE about 1.2 times their BMR. The more active you are, the bigger the gap between the two numbers becomes.
Should I eat at my BMR or TDEE?
Base your diet on your TDEE, not your BMR. Eating only your BMR ignores all the calories you burn through daily activity, creating a very large deficit that is hard to sustain and can be unsafe. Use TDEE as your maintenance level, then eat below it to lose weight or above it to gain.
How do I calculate my TDEE?
First find your BMR using a formula based on your weight, height, age, and sex. Then multiply it by an activity factor from 1.2 (sedentary) to 1.9 (extra active). For a BMR of 1,600 and a moderate factor of 1.55, TDEE is about 2,480 calories. A calorie calculator does both steps for you.
Why is my BMR so much of my daily calories?
BMR typically makes up 60 to 70% of total calories burned because keeping your body running, your heart, brain, and organs, is surprisingly energy-hungry even at rest. Activity adds the remaining share. This is also why muscle matters: more muscle raises your BMR, lifting your calorie burn even when you are doing nothing.
The bottom line
BMR is the calories you burn at rest; TDEE is everything you burn in a day, found by multiplying BMR by an activity factor from 1.2 to 1.9. A BMR of 1,600 at a moderate activity level gives a TDEE of about 2,480. Use TDEE, not BMR, as your maintenance calorie level for diet planning. Find both quickly with our BMR calculator and calorie calculator.
Further reading
For authoritative background on this topic, see Basal metabolic rate on Wikipedia.
Health disclaimer. This article is for general educational purposes only and provides estimates, not medical advice. BMR and TDEE formulas are approximations that vary by individual. Consult a qualified professional before making significant dietary changes.
Last reviewed: July 2026