What is Mifflin-St Jeor Calculator?
The Mifflin-St Jeor equation, published in 1990, was developed to improve on the older Harris-Benedict formula and has repeatedly been shown to be more accurate for the general population. It uses weight, height, age and sex, with a fixed offset that differs for men and women. Because it needs no body fat measurement it is practical for almost anyone, and it is the default in most dietetic practice. Its main limitation is that it treats all body weight alike, so it is less accurate for very muscular or very obese people — where Katch-McArdle, which uses lean mass, does better.
Common Uses for Mifflin-St Jeor Calculator
- Calculate BMR with the current clinical standard formula
- Compare Mifflin-St Jeor with other equations
- Build a calorie target from a trusted base
Frequently Asked Questions
What is the Mifflin-St Jeor formula?
For men: (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5. For women, the same with −161 instead of +5.
Why is Mifflin-St Jeor preferred?
Studies find it the most accurate of the common equations for most adults, and it needs only weight, height, age and sex. It tends to slightly overestimate in obese individuals and underestimate in very muscular ones.
Does it work without body fat data?
Yes — that is its main advantage. If you do know your body fat percentage, Katch-McArdle may be more accurate because it works from lean mass.
More Calorie & Energy Calculators
Calorie Calculator
Daily calories to maintain, lose or gain weight, based on your BMR and activity level.
BMR Calculator
Basal metabolic rate — the calories your body burns at complete rest.
TDEE Calculator
Total daily energy expenditure — all the calories you burn in a day, rest and activity included.
Maintenance Calories Calculator
The calories that keep your weight stable, from your BMR and activity level.
Calorie Deficit Calculator
The daily calorie intake that produces your chosen rate of weight loss.
Calories Burned Calculator
Calories burned in an activity from its MET value, your weight and the duration.
Harris-Benedict Calculator
BMR with the revised Harris-Benedict equation, the long-standing clinical standard.
Katch-McArdle Calculator
BMR from lean body mass, the best fit when you know your body fat percentage.