Mifflin-St Jeor Calculator (BMR)

Body weight (kg)

Height (cm)

Age (years)

Sex

Basal metabolic rate: 1 649 kcal/day

elevated requirement

This result is for information only. Historical formulas do not replace an individual assessment by a doctor or dietitian.

What do these numbers mean?

Result for the settings above: 1 649 kcal/day. It updates as soon as any field changes.

These are historical data. Each draw is independent of previous draws, so these numbers do not tell us what will be drawn next.

How do I use this page?

Fill in the fields in the form above — the result recomputes at once, with no page reload.
Under the result you will find the interpretation scale, if the calculator has one: it says which range your value fell into.
The formula we use is shown lower on this page — you can check the arithmetic yourself.
To compute the same for another game or variant, change it in the select field — prices and pools update automatically.

Interpretation scale

Interpretation scale
Range	Description
below 1200	low requirement
1200 – 1600	average requirement
1600 – 2000	elevated requirement ← your result
2000 and above	high requirement

Theory — what is the Mifflin-St Jeor calculator (BMR)?

The Mifflin-St Jeor calculator estimates basal metabolic rate (BMR) — the number of calories the body burns at complete rest to run the heart, breathing, body temperature regulation and brain activity. The calculation requires body weight, height, age and sex. Even lying still for a full day, the body would still use this much energy, so BMR is a starting point rather than total daily energy needs. The American Dietetic Association considered this formula more accurate than the older Harris-Benedict formula.

Frequently asked questions

Which BMR formula is more accurate — Mifflin or Harris-Benedict?

Mifflin-St Jeor. The American Dietetic Association recognized it in 2005 as the most accurate for adults without metabolic disorders. The 1919 Harris-Benedict formula overestimates the result by about 5 percent on average, because it was based on a sample with a different body composition than today's population.

How many calories a day do I need to lose weight?

A deficit of 500 kcal below your total requirement produces a loss of about 0.5 kg per week, since a kilogram of fat tissue corresponds to roughly 7000 kcal. Don't go below your BMR itself, though — at a BMR of 1755 kcal, eating just 1400 kcal a day leads to a slower metabolism and muscle loss.

Why do women have a lower BMR than men of the same weight?

It's due to body composition. Women on average have a higher percentage of fat tissue and a lower percentage of muscle, and muscle burns roughly three times more energy at rest than fat. That's why the Mifflin formula subtracts 161 for women and adds 5 for men — a difference of 166 kcal per day.

Does BMR change with age?

Yes, it decreases. In the formula, each year of age lowers the result by 5 kcal, so over thirty years that's 150 kcal per day. The main reason is gradual muscle mass loss, which after age 30 amounts to about 3–8 percent per decade. Strength training clearly slows this decline.

Mifflin-St Jeor Calculator (BMR)

Interpretation scale

Frequently asked questions

See also

BMI Calculator

Broca Formula Ideal Weight Calculator

Harris-Benedict BMR Calculator

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