Katch-McArdle Formula Calculator

Calculate your Basal Metabolic Rate (BMR) using the Katch-McArdle Formula with our precise and accessible online tool.

Full original guide (expanded)

Katch-McArdle Formula Calculator

This calculator helps you find your Basal Metabolic Rate (BMR) using the Katch-McArdle formula, which is ideal for individuals with a known body fat percentage. It is primarily used by fitness enthusiasts and nutritionists to tailor dietary plans.

Calculator

Results

BMR 0 kcal/day

Data Source and Methodology

All calculations are strictly based on the Katch-McArdle formula and data from scientific studies. Learn more.

The Formula Explained

Formula: BMR = 370 + 21.6 × (1 - body fat %) × weight (kg)

Glossary of Terms

  • Weight (kg): Your body weight in kilograms.
  • Body Fat Percentage (%): The percentage of your body weight that is fat.
  • BMR: Basal Metabolic Rate, the number of calories your body needs to maintain basic physiological functions.

How It Works: A Step-by-Step Example

Consider a person weighing 70 kg with 20% body fat. The calculation would be:
BMR = 370 + 21.6 × (1 - 0.20) × 70 = 370 + 21.6 × 0.80 × 70 = 370 + 1209.6 = 1579.6 kcal/day.

Frequently Asked Questions (FAQ)

What is BMR?

BMR stands for Basal Metabolic Rate and represents the number of calories your body needs to perform basic life-sustaining functions.

Why is the Katch-McArdle formula used?

This formula is ideal for individuals with a known body fat percentage, providing a more personalized estimate of caloric needs.

How accurate is the Katch-McArdle formula?

While it's more accurate than general equations for those aware of their body fat percentage, individual results can still vary.

Can I use this calculator if I don't know my body fat percentage?

It's recommended to use a different formula if you don't have an accurate body fat percentage measurement.

How often should I recalculate my BMR?

Recalculate your BMR any time there's a significant change in your weight or body composition.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted text)
Formula: BMR = 370 + 21.6 × (1 - body fat %) × weight (kg)
Variables and units
  • No variables provided in audit spec.
Sources (authoritative):
  • Learn more — a third-party calculator.com · Accessed 2026-01-19
    https://www.a third-party calculator.com/health/bmr-katch-mcardle
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

Katch-McArdle Formula Calculator

This calculator helps you find your Basal Metabolic Rate (BMR) using the Katch-McArdle formula, which is ideal for individuals with a known body fat percentage. It is primarily used by fitness enthusiasts and nutritionists to tailor dietary plans.

Calculator

Results

BMR 0 kcal/day

Data Source and Methodology

All calculations are strictly based on the Katch-McArdle formula and data from scientific studies. Learn more.

The Formula Explained

Formula: BMR = 370 + 21.6 × (1 - body fat %) × weight (kg)

Glossary of Terms

  • Weight (kg): Your body weight in kilograms.
  • Body Fat Percentage (%): The percentage of your body weight that is fat.
  • BMR: Basal Metabolic Rate, the number of calories your body needs to maintain basic physiological functions.

How It Works: A Step-by-Step Example

Consider a person weighing 70 kg with 20% body fat. The calculation would be:
BMR = 370 + 21.6 × (1 - 0.20) × 70 = 370 + 21.6 × 0.80 × 70 = 370 + 1209.6 = 1579.6 kcal/day.

Frequently Asked Questions (FAQ)

What is BMR?

BMR stands for Basal Metabolic Rate and represents the number of calories your body needs to perform basic life-sustaining functions.

Why is the Katch-McArdle formula used?

This formula is ideal for individuals with a known body fat percentage, providing a more personalized estimate of caloric needs.

How accurate is the Katch-McArdle formula?

While it's more accurate than general equations for those aware of their body fat percentage, individual results can still vary.

Can I use this calculator if I don't know my body fat percentage?

It's recommended to use a different formula if you don't have an accurate body fat percentage measurement.

How often should I recalculate my BMR?

Recalculate your BMR any time there's a significant change in your weight or body composition.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted text)
Formula: BMR = 370 + 21.6 × (1 - body fat %) × weight (kg)
Variables and units
  • No variables provided in audit spec.
Sources (authoritative):
  • Learn more — a third-party calculator.com · Accessed 2026-01-19
    https://www.a third-party calculator.com/health/bmr-katch-mcardle
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

Katch-McArdle Formula Calculator

This calculator helps you find your Basal Metabolic Rate (BMR) using the Katch-McArdle formula, which is ideal for individuals with a known body fat percentage. It is primarily used by fitness enthusiasts and nutritionists to tailor dietary plans.

Calculator

Results

BMR 0 kcal/day

Data Source and Methodology

All calculations are strictly based on the Katch-McArdle formula and data from scientific studies. Learn more.

The Formula Explained

Formula: BMR = 370 + 21.6 × (1 - body fat %) × weight (kg)

Glossary of Terms

  • Weight (kg): Your body weight in kilograms.
  • Body Fat Percentage (%): The percentage of your body weight that is fat.
  • BMR: Basal Metabolic Rate, the number of calories your body needs to maintain basic physiological functions.

How It Works: A Step-by-Step Example

Consider a person weighing 70 kg with 20% body fat. The calculation would be:
BMR = 370 + 21.6 × (1 - 0.20) × 70 = 370 + 21.6 × 0.80 × 70 = 370 + 1209.6 = 1579.6 kcal/day.

Frequently Asked Questions (FAQ)

What is BMR?

BMR stands for Basal Metabolic Rate and represents the number of calories your body needs to perform basic life-sustaining functions.

Why is the Katch-McArdle formula used?

This formula is ideal for individuals with a known body fat percentage, providing a more personalized estimate of caloric needs.

How accurate is the Katch-McArdle formula?

While it's more accurate than general equations for those aware of their body fat percentage, individual results can still vary.

Can I use this calculator if I don't know my body fat percentage?

It's recommended to use a different formula if you don't have an accurate body fat percentage measurement.

How often should I recalculate my BMR?

Recalculate your BMR any time there's a significant change in your weight or body composition.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted text)
Formula: BMR = 370 + 21.6 × (1 - body fat %) × weight (kg)
Variables and units
  • No variables provided in audit spec.
Sources (authoritative):
  • Learn more — a third-party calculator.com · Accessed 2026-01-19
    https://www.a third-party calculator.com/health/bmr-katch-mcardle
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn
Formulas

(Formulas preserved from original page content, if present.)

Version 0.1.0-draft
Citations

Add authoritative sources relevant to this calculator (standards bodies, manuals, official docs).

Changelog
  • 0.1.0-draft — 2026-01-19: Initial draft (review required).