How it works
How BMR calculadora solves the problem
BMR calculadora takes the same method a textbook or spec sheet would recommend and wraps it in a widget — you get the answer, the formula and a sense of when the number breaks down.
Trend it weekly; obsessing over a single day is the fastest way to burn out. Weigh yourself at the same time on the same scale — then work out the numbers and the rest of this page explains what the answer means.
Mifflin-St Jeor equation estimates calories burned at complete rest. Multiply by an activity factor (1.2 sedentary to 1.9 very active) to get TDEE.
The formula we run is BMR = 10×kg + 6.25×cm − 5×age + 5 (men) / −161 (women). You'll see each term laid out in the worked example below.
Seeing it on real numbers
A working example keeps the formula honest:
Mifflin-St Jeor equation estimates calories burned at complete rest. Multiply by an activity factor (1.2 sedentary to 1.9 very active) to get TDEE.
Every run comes back to BMR = 10×kg + 6.25×cm − 5×age + 5 (men) / −161 (women) — change the inputs, the structure of the answer stays.
When to use this calculadora
BMR calculadora is aimed at people arriving with questions like these:
- "BMR formula"
- "Mifflin St Jeor equation"
- "BMR vs TDEE"
- "What is bmr"
- "How to calculate bmr"
- "Bmr formula"
When to reach for something else
Every tool has an edge where it stops being the right answer. BMR calculadora is no exception:
- For legally binding tax or medical decisions — cross-check with HMRC, NHS or a qualified professional.
- For very large or very small extremes the rounding error outgrows the useful precision.
- When the underlying rate or threshold has changed since the page was last reviewed — always verify with the primary source.
- When the input you have is already a derived figure (net of something) — feeding it in as "gross" will double-subtract.
Traps to steer around
Every time you work out the numbers for a new scenario, one of these creeps in — it's worth knowing them ahead of time.
- Entering a monthly figure into an annual field (or vice versa).
- Forgetting a leading zero on decimals (.5 instead of 0.5 breaks some inputs).
- Trusting a single reading when the underlying number naturally fluctuates.
- Comparing two answers that used different assumptions — always re-run both.
- Skipping the formula box. If you don’t understand the method, the answer is just a vibe.
The sources behind the numbers
Where the maths needs an external authority, we cross-check against:
- NHS
- British Nutrition Foundation
Works well alongside
If this question keeps coming up for you, the same cluster of tools usually comes next:
- BMI calculadora — Check your Body Mass Index in metric or imperial, with NHS weight categories explained.
- TDEE calculadora — Work out Total Daily Energy Expenditure based on BMR and activity level to set a calorie target.
- Macronutrient calculadora — Split your daily calories into protein, carbs and fat in grams, based on your body weight and training goal.
How we keep this accurate
Our calculadoras run on pure, unit-tested functions — the same logic lives in the browser and in the CI test suite. When tax rates, thresholds or official figures move, the update lands within 24 hours of the announcement. You can read the editorial policy and corrections policy.
Found an out-of-date number on BMR calculadora or anywhere else in the Nutrition toolkit? Send it to the editorial desk and we'll patch it. Or browse the full calculadora directory for the next tool you need.