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Mifflin St Jeor Equation for Men and Women, by Weight, Height, Age and Source
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Searching for "mifflin st jeor equation men 10 weight 6.25 height -5 age +5 source" usually means looking up the exact numbers behind the Mifflin-St Jeor formula for basal metabolic rate.
Those numbers are real: 10 times weight in kilograms, plus 6.25 times height in centimetres, minus 5 times age, plus 5 for men or minus 161 for women - the formula Mifflin and St Jeor published in 1990.
gottrix's calorie calculator right below runs exactly that formula, live, so you get your own basal metabolic rate and total daily calorie need instead of doing the arithmetic by hand.
Do it right here
One long search string keeps showing up in query logs. It is not a typo - it reads like someone quoting the formula's own coefficients back at a search engine.
| Written as | What it means |
|---|---|
| 10 * weight (kg) | The first term of the Mifflin-St Jeor formula: ten times body weight in kilograms. A heavier body burns more energy at rest, so this term dominates the result. |
| 6.25 * height (cm) | The second term: 6.25 times height in centimetres. A taller body has more tissue to maintain, so height adds to the basal rate too, though less strongly than weight. |
| -5 * age (years) | The third term subtracts five times age in years. Basal metabolism slows down as the body ages, which this negative term captures. |
| +5 for men, -161 for women | The final, sex-specific constant. Men get a flat +5 kcal/day added, women a flat -161 kcal/day subtracted - the formula's way of accounting for the average difference in lean body mass between the sexes. |
| "source" | Usually added to ask where the formula comes from: Mifflin MD, St Jeor ST and colleagues, published in the American Journal of Clinical Nutrition in 1990, still one of the most widely used basal-metabolic-rate estimates today. |
Put together, weight, height, age and sex feed the exact Mifflin-St Jeor formula; an activity level then scales the result to a total daily calorie need. The calculator below runs all of it instantly, so there is nothing to compute by hand.
FAQ
Is the Mifflin-St Jeor equation really 10 x weight + 6.25 x height - 5 x age + 5 for men (or -161 for women)?
Yes. That is the exact 1990 Mifflin-St Jeor formula for basal metabolic rate in kcal/day, with weight in kilograms and height in centimetres - and it is the same formula this calculator uses.
Where does this formula come from?
From Mifflin MD, St Jeor ST and colleagues, published in the American Journal of Clinical Nutrition in 1990 - it replaced the older Harris-Benedict equation as a more accurate estimate for modern populations.
Does the calculator below use exactly this formula, or a different one?
Exactly this one. The basal-metabolic-rate figure is computed with the same coefficients (10, 6.25, -5, +5/-161) before an activity factor scales it up to the total daily figure.
Why +5 for men but -161 for women, not the same size of number?
The formula accounts for the average difference in lean body mass between the sexes with one flat constant per sex rather than a separate multiplier - which is why the two numbers are so different in size.
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