What is Harris-Benedict Calculator?
The Harris-Benedict equation dates to 1919 and was the first widely used BMR formula. It was revised in 1984 by Roza and Shizgal to correct for a population that had become heavier, and that revised version is what most people mean today. It uses weight, height, age and sex, with different constants for men and women. Comparative studies consistently find it reads a few percent higher than Mifflin-St Jeor, so if you use it for a calorie target, expect the maintenance figure to be slightly optimistic. It is included here for comparison and because older clinical material still references it.
Common Uses for Harris-Benedict Calculator
- Use the formula behind much older clinical material
- Compare Harris-Benedict with modern equations
- Understand why different calculators disagree
Frequently Asked Questions
Which Harris-Benedict version is used?
The 1984 revision by Roza and Shizgal, which is the version in current use. The original 1919 equation overestimates more.
Is Harris-Benedict accurate?
It is reasonable but tends to overestimate BMR by a few percent compared with Mifflin-St Jeor. For a calorie target, start a little lower than its output suggests.
Should I use Mifflin or Harris-Benedict?
Mifflin-St Jeor for most people. Harris-Benedict is useful as a comparison, and because some clinical protocols and historical references are built on it.
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