Why is it slightly different from Mifflin?

The two equations use different constants. Mifflin tends to run a few percent higher for most adults. Either is fine for planning.

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BMR (Harris-Benedict) Calculator

The original Harris-Benedict formula, revised in 1984. Compare it to the Mifflin-St Jeor estimate to see the range.

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Why is it slightly different from Mifflin?: The two equations use different constants. Mifflin tends to run a few percent higher for most adults. Either is fine for planning.