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BMR Calculator

Updated Sep 2026 Used 0 times
Enter the measured valuesUse values from one internally consistent test or planning scenario.
Select the term used by the original published equation.
Current measured body mass.
Standing height without shoes.
The original equation was developed for adults.

Guest calculations stay on this device. Signed-in results sync privately.

Your result

Resting energy estimate

Enter your values, then calculate to see a verified result.

Inputs usedReview the information used for this result.
Full calculation and sourcesOpen Full calculation and sources to audit the formula, assumptions, fixtures, and interpretation limits.

Versioned calculationFormula v1.0.0

Method reviewed 2026-09-27PubMed - original Mifflin-St Jeor resting-energy equation; NCBI Bookshelf - estimating resting metabolic rateFormula v1.0.0

Method shown

The selected equation and assumptions stay visible.

Cross-checked

Supporting outputs expose unit and protocol mistakes.

Actionable

The result links to the next relevant planning task.

Result actions
1
Step 1Select the published equation term.Adult male equation example
2
Step 2Enter measured body mass and height.Adult male equation example
3
Step 3Enter adult age.Adult male equation example

Interpretation

Predictive equations can differ from indirect calorimetry for an individual.

The estimate is not TDEE, a nutrition prescription, or an energy-availability assessment.

Pregnancy, illness, disability, growth, and unusual body composition may require specialist methods.

Use this result

Keep exploring

4 available tools
Carb Loading CalculatorTurn a selected g/kg target into a food-planning quantity.Weekly Volume CalculatorCompare a target week with recent training volume.VO2 Max CalculatorEstimate aerobic capacity from a measured 12-minute run.Race Day ChecklistGenerate a race-, weather-, and travel-specific checklist.
Public verification recordFormula v1.0.0
Review scope
Both Equation Constants, Metric Inputs, Energy Conversion, Adult Boundaries, And BMI Cross-check.
Review team
CalculatorGeek Expert Review Team
Verified
2026-09-27
Next source review
2027-03-27
Automated fixtures
1 cases

Review method

Recompute Male term: 10W + 6.25H - 5A + 5; female term: 10W + 6.25H - 5A - 161. independently; verify unit normalization, protocol selection, internal consistency, and invalid boundaries.

Known limitations

  • Predictive equations can differ from indirect calorimetry for an individual.
  • The estimate is not TDEE, a nutrition prescription, or an energy-availability assessment.
  • Pregnancy, illness, disability, growth, and unusual body composition may require specialist methods.

Primary sources

Latest update

2026-09-27 ยท Added complete endurance-suite calculator with verified model, source ledger, premium result, and unified contextual navigation.

Published calculation checks

CaseInputsExpected result
Adult male equation examplesex=male, body_mass_kg=70 kg, height_cm=175 cm, age_years=35 yrbmr_kcal_day=1623.75, bmr_kj_day=6793.77
On this page

Direct answer

The calculator applies the adult Mifflin-St Jeor predictive equation to estimate resting energy expenditure.

BMR or resting-energy equations do not include training load, daily movement, digestion, or an individual energy-availability assessment.

Use the established Body Fat Calculator for composition estimates and treat the Race Weight Calculator only as scenario arithmetic.

How to use the calculator

  1. Select the published equation term.
  2. Enter measured body mass and height.
  3. Enter adult age.
  4. Do not multiply by activity unless your separate task is TDEE.

Continue with Check the worked example or Interpret the result safely for the next calculation.

Inputs, outputs, and result meaning

Inputs

  • Equation sex term: Select the term used by the original published equation.
  • Body mass: Current measured body mass.
  • Height: Standing height without shoes.
  • Age: The original equation was developed for adults.

Outputs

  • Estimated BMR: A displayed result from the stated method and the entered assumptions.
  • Estimated BMR: A displayed result from the stated method and the entered assumptions.
  • Seven-day equivalent: A displayed result from the stated method and the entered assumptions.
  • BMI cross-check: A displayed result from the stated method and the entered assumptions.

Formula and methodology

Method: Male term: 10W + 6.25H - 5A + 5; female term: 10W + 6.25H - 5A - 161.

W is kilograms, H is centimeters, and A is years. The result estimates resting energy, not total daily expenditure.

Worked examples

70 kg, 175 cm, age 35, male term

700 + 1,093.75 - 175 + 5 = 1,623.75 kcal/day.

Interpretation and limitations

  • Predictive equations can differ from indirect calorimetry for an individual.
  • The estimate is not TDEE, a nutrition prescription, or an energy-availability assessment.
  • Pregnancy, illness, disability, growth, and unusual body composition may require specialist methods.

Frequently asked questions

Is BMR the calories I should eat?

No. Food intake must also account for activity, digestion, goals, health, and energy availability.

Why is activity not included?

Activity belongs to total daily expenditure, not the resting equation.

Can teenagers use this version?

This implementation is intentionally limited to adults.

How should I compare results over time?

Repeat the same protocol, units, equipment setup, and environmental conditions, then review the supporting outputs rather than only the headline number.

Sources and transparency

CalculatorGeek independently recomputed every published fixture on 2026-09-27. Sources establish the equation, protocol, or interpretation boundary; they do not turn an estimate into a laboratory measurement or personalized advice.