BMR vs TDEE: What's the Difference?

How bmr vs tdee works in practice

Basal Metabolic Rate (BMR) is energy expended at rest for vital functions (breathing, circulation, cell repair). Total Daily Energy Expenditure (TDEE) equals BMR multiplied by an activity factor that accounts for work, exercise, and NEAT (non-exercise movement).

The goal is not to memorize every term — it is to know which inputs matter and what outcome you are aiming for.

So what: When you can explain this in your own words, you are far less likely to accept a bad quote, fee, or assumption.

A real scenario worth running

Man, 80 kg, 180 cm, 35 years, desk job (sedentary 1.2×). Step by step: BMR = 10×80 + 6.25×180 − 5×35 + 5 = 1,780 kcal → TDEE = 1,780 × 1.2 = 2,136 kcal (sedentary) → If adds 3× gym/week → use 1.55× → TDEE ≈ 2,759 kcal. Bottom line: Same person: TDEE ranges 2,136–2,759 kcal depending on activity — pick honest activity level.

So what: Plug your own numbers into the same logic before you decide.

BMR and TDEE in plain language

BMR (Basal Metabolic Rate) is calories burned at complete rest — breathing, circulation, cell repair. TDEE (Total Daily Energy Expenditure) is BMR plus everything else: digestion, walking, exercise, and fidgeting. BMR is roughly 60–75% of TDEE for most people. Use BMR to understand baseline metabolism; use TDEE to set eating targets.

So what: Run your own inputs before you commit — small changes in assumptions can shift the outcome sharply.

The Mifflin-St Jeor BMR formula

Most accurate widely cited formula for adults:

Men:   BMR = 10×W + 6.25×H − 5×A + 5
Women: BMR = 10×W + 6.25×H − 5×A − 161

W = weight (kg), H = height (cm), A = age (years)

So what: Run your own inputs before you commit — small changes in assumptions can shift the outcome sharply.

BMR vs TDEE: side-by-side

Never eat at BMR long-term — you'd ignore 25–40% of daily burn from normal activity.

So what: Run your own inputs before you commit — small changes in assumptions can shift the outcome sharply.

Worked example: same person, different activity

Man, 80 kg, 180 cm, 35 years:

1. BMR = 10×80 + 6.25×180 − 5×35 + 5 = 1,780 kcal
2. Sedentary (1.2×): TDEE = 1,780 × 1.2 = 2,136 kcal
3. Moderate gym 3×/week (1.55×): TDEE = 1,780 × 1.55 = 2,759 kcal

Same BMR — 623 kcal difference from activity alone. Pick an honest activity level.

So what: Run your own inputs before you commit — small changes in assumptions can shift the outcome sharply.

What raises and lowers BMR

Exercise mainly increases TDEE (calories during and after activity), not BMR permanently — though building muscle raises BMR slightly.

So what: Run your own inputs before you commit — small changes in assumptions can shift the outcome sharply.

Using BMR and TDEE for weight goals

Avoid eating far below BMR without medical supervision — risks muscle loss, fatigue, and nutrient gaps.

So what: Run your own inputs before you commit — small changes in assumptions can shift the outcome sharply.

Common mistakes

1. BMR ≈ 60–75% of TDEE for most people — this quietly costs you over time.
2. Mifflin-St Jeor is the most cited BMR formula for adults — this quietly costs you over time.
3. Never eat at BMR long-term — TDEE is your practical baseline..
4. Muscle mass raises BMR; extreme dieting lowers it (adaptation) — this quietly costs you over time.

What to do next

Use our BMR Calculator to model your situation — change one input at a time to see what moves the result most.