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BMR Calculator

Calculate Basal Metabolic Rate and daily calorie needs.
Decision Context
Page-specific guidance for using this result in a real planning decision.

Use this page to estimate basal metabolic rate so you can understand the calories your body uses at rest before layering on activity or diet targets.

It works well for maintenance planning, weight-change strategy, and comparing how age, sex, size, and activity assumptions affect energy needs.

Treat BMR as a baseline, then test total daily energy needs with realistic activity levels rather than assuming the resting estimate alone should guide intake.

Methodology, assumptions, and limitations

The calculator estimates resting energy expenditure from age, height, weight, and sex using the Mifflin–St Jeor equation. Activity is not part of BMR and is applied separately when estimating total daily energy needs.

Assumptions
  • Inputs describe an adult and use the displayed units.
  • The predictive equation is appropriate as a population-level estimate.
  • Resting energy needs are expressed in kilocalories per day.
Limitations
  • Measured metabolism can differ from a predictive equation.
  • Body composition, illness, pregnancy, and medications can affect energy needs.
  • The estimate should not be treated as a prescribed calorie intake.

Sources and standards

Related calculators

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Enter your values
Results
BMR (Resting)
1649
kcal/day
TDEE (Maintenance)
1979
kcal/day
Analysis
Interpretation of the current calculator output

Calculation Summary

The current inputs have been processed for the bmr calculator. Review the results panel for the computed output and use the charts tab to compare the current values visually.

How to Read It

The main result shows the direct answer for your current inputs. Supporting sections below explain the method, example, and common questions so the result is easier to interpret.

How to Use

Step-by-step instructions
  1. 1Select gender and unit system.
  2. 2Enter age, height, and weight.
  3. 3Select activity level.
  4. 4The calculator shows your BMR and TDEE.

Mifflin-St Jeor

Calculates energy expenditure at rest based on weight (W), height (H), age (A), and gender adjustment (s).
BMR = 10W + 6.25H - 5A + s

Variables:

WWeight (kg)
HHeight (cm)
AAge (years)

Example

30yo Male

Inputs:

Height:175 cm
Weight:70 kg
Age:30

Steps:

  1. 1.10(70) + 6.25(175) - 5(30) + 5
  2. 2.700 + 1093.75 - 150 + 5
  3. 3.BMR = 1649 kcal
Result:
1649 kcal/day

Frequently Asked Questions

What is BMR?

Basal Metabolic Rate is the number of calories your body burns at complete rest to maintain basic life functions like breathing and circulation.

What is TDEE?

Total Daily Energy Expenditure is your BMR multiplied by an activity factor. It represents the total calories you burn in a day.
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Specific Guides
Focused pages for closely related calculation questions.
BMR Calculator Mifflin St Jeor

Estimate basal metabolic rate using the Mifflin-St Jeor approach so calorie planning starts from a more explicit resting-energy model.