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HomecalculateBMR Calculator

BMR Calculator

Estimate the calories your body burns at rest from weight, height, age, and sex, using the Mifflin-St Jeor equation.

Health tools disclaimer

Results are educational estimates based on the formulas and inputs shown. They are not medical advice, diagnosis, or treatment. For clinical decisions, medication dosing, or emergency symptoms, consult a licensed healthcare professional.

Verification & transparency

Automated checks: engine-validated output
Last updated:2026-07-31
|
Sources:WHO 2024 · CDC Growth Charts · Mifflin-St Jeor 1990 · IOM 2009 Weight Gain
|
Reference:bmr = 10 * weightKg + 6.25 * heightCm - 5 * ageYears + sexConstant
|Rounding & precision policy
Inputs Reference
  • Weight (kg)
  • Height (cm)
  • Age (years)
  • Sex constant
Formula

bmr = 10 * weightKg + 6.25 * heightCm - 5 * ageYears + sexConstant

On This Page
  • Primary output (BMR)
  • calculatorInputsTitle
  • reverseSolveLabel
  • calculatorFormulaTitle
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Content reviewed by Anoop Kumar

Imperial

Body metrics

BMR1 617.50cal/day
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Verified methodology

Calculations follow established definitions and are tested against reference datasets. We document how each tool works and when to use it.

Methodology

Data & accuracy

Unit conversions follow SI and common measurement standards. We use careful numeric handling to reduce rounding surprises.

Sources & standards

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Privacy policy
  • Computation graph
  • BMR decision comparison
  • Result chart
  • How to use this calculator
    • Common Questions
    • When is this health estimation context enough?
    • What should I record with the result?
    • When should I use a specialized modifier?

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    © 2026 ExpertToolkit. All rights reserved.

    Release 2.5Market: United States

    Primary output (BMR)

    BMR

    1617.5

    Computed from default inputs using graph `synth-bmr-calculator`.

    Calculator inputs

    Weight
    70 kg
    Range: 20 - 300

    Mathematical model

    bmr = 10 * weightKg + 6.25 * heightCm - 5 * ageYears + sexConstant

    Main equation used by this calculator. Numeric steps follow the page's precision and rounding rules.

    Term Glossary

    Weight
    Weight is a declared input for BMR Calculator, measured in kg. Check this value and its unit before reusing the result.
    Sources & Standards
  • Rounding Policy
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    • About Us
    Height
    170 cm
    Range: 50 - 250
    Age
    30 years
    Range: 1 - 120
    Sex constant
    5
    Range: -161 - 5

    Reverse Solve

    Solve for Weight

    Weight: 86.175 for BMR 1.779e+3

    Formula and method

    Mifflin-St Jeor basal metabolic rate estimate.

    bmr=10⋅weightKg+6.25⋅heightCm−5⋅ageYears+sexConstant bmr=10\cdot weightKg+6.25\cdot heightCm-5\cdot ageYears+ sexConstantbmr=10⋅weightKg+6.25⋅heightCm−5⋅ageYears+sexConstant

    Computation graph

    1. bmr10 * weightKg + 6.25 * heightCm - 5 * ageYears + sexConstant

    BMR decision comparison

    BMR decision comparison

    itemvaluenote
    Stress low1117.5Weight: 20
    Downside1547.5Weight: 63
    Base case1617.5Weight: 70
    Upside1687.5Weight: 77
    Stress high3917.5Weight: 300

    Result chart

    Visual Analysis1 series8 points

    Expanded chart built from the same sensitivity run as the table, so users can read the trend and verify the numbers in one place.

    Trend
    Upward
    Min
    1.1K
    Max
    3.3K
    Insight
    BMR shows an upward pattern, with a visible peak around 237.7778 at 3.3K.
    1.1K1.7K2.2K2.8K3.3K2051.111182.2222113.3333144.4444175.5556206.6667237.7778

    Visual response curve for BMR.

    How to use this calculator

    Health tools disclaimer: Educational estimates only, not medical advice, diagnosis, or treatment. For clinical decisions, dosing, or emergencies, follow guidance from US Department of Health & Human Services and a licensed professional in your jurisdiction.

    Estimate daily resting calorie needs with the Mifflin-St Jeor equation.

    BMR Calculator turns Weight, Height, Age, and Sex constant into BMR. Confirm the units and assumptions match your situation before relying on the result.

    BMR Calculator produces a screening estimate, not a diagnosis. Measurements such as Weight, Height, Age, and Sex constant translate into BMR, which is useful for tracking a trend over time or preparing questions for an appointment — not for deciding treatment, dosing, or urgency on its own.

    Estimate quality tracks measurement quality: enter current values, use the units each input asks for, and describe the individual case rather than a population average. If a result would change medication use, urgent care timing, or a treatment decision, stop at the estimate and confirm the next step with a licensed professional.

    Overwhelm from technical jargon

    Start with the basic inputs only — advanced options can be explored once you understand the fundamentals. Important: Don't be discouraged if your results seem unfavorable — these tools help you plan, not judge.

    Enter your values, then check the formula, scenarios, and FAQ to confirm the assumptions fit your case. For medical, financial, legal, or safety-critical decisions, treat the output as an estimate and verify it against the relevant professional standard.

    Sources & Standards

    1. World Health Organization. "Body mass index - BMI." WHO Regional Office for Europe, 2024.BMI classification thresholds: underweight <18.5, normal 18.5-24.9, overweight 25-29.9, obese ≥30
    2. Centers for Disease Control and Prevention. "About Child & Teen BMI." CDC, 2024.Pediatric BMI uses age-sex-specific percentiles, not adult thresholds
    3. Mifflin MD, St Jeor ST, et al. "A new predictive equation for resting energy expenditure in healthy individuals." Am J Clin Nutr. 1990;51(2):241-247.BMR formula: 10×weight(kg) + 6.25×height(cm) - 5×age - 161 (female) or +5 (male)
    4. Institute of Medicine. "Weight Gain During Pregnancy: Reexamining the Guidelines." National Academies Press, 2009.Recommended pregnancy weight gain by pre-pregnancy BMI category

    Verify this result

    This answer is computed by CalculationEngine (v1.0.0). The same inputs always produce the same figure and the same fingerprint below, so you can reproduce and cite it.

    Standards

    • WHO 2024 — BMI classification thresholds: underweight <18.5, normal 18.5-24.9, overweight 25-29.9, ob
    • CDC Growth Charts — Pediatric BMI uses age-sex-specific percentiles, not adult thresholds
    • Mifflin-St Jeor 1990 — BMR formula: 10×weight(kg) + 6.25×height(cm) - 5×age - 161 (female) or +5 (male)

    Assumptions

    • Scenariodefault inputs
    • Methodformula-graph evaluation
    • Formulabmr = 10 * weightKg + 6.25 * heightCm - 5 * ageYears + sexConstant

    Inputs & outputs

    • in · weightKg70
    • in · heightCm170
    • in · ageYears30
    • in · sexConstant5
    • out · BMR1617.5

    Computation fingerprint (SHA-256)

    2e73e46ed7748250f733c05f8d4b0b66a7f4ca234bb4b8a36e6a2e05d0b6f1da

    Related Tools

    BMI CalculatorgraphBMR Calculatorgraph

    BMR Calculator context FAQ

    When is this health estimation context enough?
    Use it when the result only depends on age, sex, height and no local rule changes the interpretation.
    What should I record with the result?
    Record the input values, reference population, measurement unit, activity estimate, output unit, and rounding rule used in the calculation.
    When should I use a specialized modifier?
    Use a specialized modifier when measurement units, reference range, age/sex context, and non-diagnostic limits materially changes how the same result should be explained.

    Worked Examples — BMR Calculator

    ScenarioInputsResultInterpretation
    Mifflin-St Jeor, 30-year-old maleWeight: 80 kg; Height: 180 cm; Age: 30; Sex: MaleBMR = 1,780 kcal/dayMifflin-St Jeor (men): 10 × 80 + 6.25 × 180 − 5 × 30 + 5 = 800 + 1,125 − 150 + 5 = 1,780 kcal/day. This is energy burned at complete rest. Multiplying by an activity factor gives estimated maintenance calories: ~2,136 kcal/day sedentary (×1.2) or ~2,759 kcal/day with moderate exercise 3–5 days/week (×1.55).
    Mifflin-St Jeor, 45-year-old femaleWeight: 65 kg; Height: 165 cm; Age: 45; Sex: FemaleBMR = 1,295 kcal/dayThe female form subtracts 161 instead of adding 5: 10 × 65 + 6.25 × 165 − 5 × 45 − 161 = 1,295 kcal/day. With light activity (×1.375), estimated maintenance is ~1,781 kcal/day. The −5 × age term means predicted BMR falls about 50 kcal/day per decade at constant weight and height.
    Mifflin-St Jeor vs Harris-Benedict, same personWeight: 80 kg; Height: 180 cm; Age: 30; Sex: MaleMifflin-St Jeor: 1,780 | Revised Harris-Benedict: 1,854 kcal/dayThe revised Harris-Benedict equation (Roza & Shizgal, 1984) gives 88.362 + 13.397 × 80 + 4.799 × 180 − 5.677 × 30 = 1,854 kcal/day — 74 kcal (about 4%) above Mifflin-St Jeor. Gaps of 3–8% between equations are normal. Pick one equation and stay with it when tracking change over time.
    Height
    Height is a declared input for BMR Calculator, measured in cm. Check this value and its unit before reusing the result.
    Age
    Age is a declared input for BMR Calculator, measured in years. Check this value and its unit before reusing the result.
    Sex constant
    Use 5 for male and -161 for female in Mifflin-St Jeor.
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