---
title: "BMR Calculator — Mifflin-St Jeor, Harris-Benedict, Katch-McArdle"
description: "Calculate your Basal Metabolic Rate using three formulas. Compare Mifflin-St Jeor (US standard), Harris-Benedict, and Katch-McArdle. Free, no ads."
url: "https://worldcalculators.org/calculators/bmr/"
canonical: "https://worldcalculators.org/calculators/bmr/"
---

# BMR Calculator

Calculate your Basal Metabolic Rate using three formulas. Compare Mifflin-St Jeor (US standard), Harris-Benedict, and Katch-McArdle. Free, no ads.

## Quick answer

BMR is your resting calorie burn. Mifflin-St Jeor (1990) is the most accurate for most adults — recommended by US dietitians. The UK NHS uses the Schofield equation. Harris-Benedict is the classic formula still widely used internationally. To get TDEE (actual daily needs), multiply BMR by your activity multiplier (1.2–1.9×).

## Mifflin-St Jeor Formula (Most Accurate)

Published in 1990 by Mifflin, St Jeor, Hill, and Scott, this formula was validated against indirect calorimetry in a 2005 study by Frankenfield et al. (Journal of the American Dietetic Association). It's now the preferred formula for clinical dietetics in the US, Canada, and Australia.

## Sources & Methodology

Basal metabolic rate is estimated with the Mifflin–St Jeor equation (default), with Harris–Benedict and Katch–McArdle as alternatives where lean body mass is known.

Source: https://worldcalculators.org/calculators/bmr/
Markdown mirror of the HTML page. Prefer this URL for RAG; the interactive calculator still lives on the HTML page.