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BMR Calculator Examples

Reproduce three BMR examples using Mifflin-St Jeor, revised Harris-Benedict, and Katch-McArdle with U.S. and metric inputs.

How should you use these BMR Calculator examples?

These examples turn the BMR Calculator inputs into complete scenarios with stated values, calculation steps, and interpreted results. Use them to check how the calculator behaves, compare your own situation with realistic cases, and identify which inputs have the greatest effect before relying on an estimate.

These examples use the same calculation engine as the BMR Calculator. They demonstrate three different equations and profiles; they are not calorie recommendations.

Example 1: Mifflin-St Jeor with U.S. Measurements

A 30-year-old man is 5 feet 10 inches tall and weighs 175 pounds. The calculator converts the measurements to 177.80 cm and 79.379 kg.

10(79.37866)+6.25(177.80)−5(30)+5=1760.03710(79.37866)+6.25(177.80)-5(30)+5=1760.037
Selected BMR1760 Calories/day
Kilojoules7364 kJ/day
Hourly equivalent73.33 Calories/hour
Formula spread93.09 Calories/day

Example 2: Revised Harris-Benedict with Metric Inputs

A 40-year-old woman is 165 cm tall and weighs 65 kg. Revised Harris-Benedict uses the published female coefficients.

447.593+9.247(65)+3.098(165)−4.330(40)=1386.618447.593+9.247(65)+3.098(165)-4.330(40)=1386.618
Selected BMR1387 Calories/day
Kilojoules5802 kJ/day
Weekly equivalent9706 Calories/week
Formula spread66.37 Calories/day

Example 3: Katch-McArdle from Lean Mass

A 35-year-old man is 180 cm tall, weighs 85 kg, and enters 15% body fat. Katch-McArdle uses weight and body fat to estimate lean mass.

LBM=85(1−0.15)=72.250kgLBM=85(1-0.15)=72.250 kg
370+21.6(72.250)=1930.600370+21.6(72.250)=1930.600
Estimated lean mass72.25 kg
Selected BMR1931 Calories/day
Kilojoules8078 kJ/day
Formula spread125.60 Calories/day

Compare the Three BMR Examples

ScenarioSelected equationBMRImportant input
Example 1Mifflin-St Jeor1760 Calories/dayAge, height, weight, male term
Example 2Revised Harris-Benedict1387 Calories/dayAge, height, weight, female term
Example 3Katch-McArdle1931 Calories/dayWeight and 15% body fat

These outputs should not be compared as if only the formula changed because the profiles also differ. To compare equations fairly, keep the person's inputs fixed and change only the selected formula.

How to Reproduce the Results

For “How to Reproduce the Results,” the BMR Calculator examples organizes the relevant inputs, applies the documented method, and shows a result that can be compared across scenarios. The points below identify the specific considerations and assumptions users should review before relying on the estimate.

  1. Open the BMR Calculator.
  2. Select the unit system used by the example.
  3. Enter age, the published sex term, height, weight, and body-fat percentage.
  4. Select the named equation.
  5. Choose Calories or kilojoules and calculate.
  6. Compare the headline result, formula table, and text alternatives with the values above.

For the exact coefficients and conversion factors, review the BMR formula page.

References

These references support the calculation method, assumptions, or current program guidance.

Corrections and Review

Report an issue or error in the calculator using the Contact Us page.

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