BMR Calculator
Estimate resting energy expenditure with the Mifflin-St Jeor predictive equation using age, sex input, height and weight.
Use the BMR Calculator
Estimate resting energy expenditure with the Mifflin-St Jeor predictive equation using age, sex input, height and weight.
Calculation, text generation and supported file processing happen locally in your browser; this batch does not require a new external processing service.
Health information only. This page performs the stated arithmetic/estimate and is not a diagnosis, treatment plan, medical clearance, fertility guarantee or substitute for a qualified health professional. Seek urgent medical care for urgent symptoms or concerning readings.
Reference used for this implementation: Mifflin et al. resting-energy equation: https://pubmed.ncbi.nlm.nih.gov/2305711/
How to use it
Start with the realistic worked example, replace it with your own verified values or files, inspect the result, and check the stated assumptions and limitations before using the output.
How the BMR Calculator works
Estimate resting energy expenditure with the Mifflin-St Jeor predictive equation using age, sex input, height and weight. ToolLott presents this as a health screening/planning estimate, not a diagnosis, and anchors the method to the authoritative reference(s) listed below plus the passed Build 0227 QA fixture.
Calculation breakdown
ToolLott will explain the current inputs and displayed result here.
Mifflin-St Jeor resting energy estimate
The production method for BMR Calculator is: Men: BMR = 10W + 6.25H - 5A + 5; women: BMR = 10W + 6.25H - 5A - 161. The calculation keeps the entered values visible and the live explanation changes with the current result so users can see exactly what was estimated.
Men: BMR = 10W + 6.25H - 5A + 5; women: BMR = 10W + 6.25H - 5A - 161ToolLott evaluates the documented relationship with the entered values before display formatting.
| Symbol / input | Meaning | Unit |
|---|---|---|
sex | Sex input used by equation | user input |
age | Age (years) | user input |
weight | Weight (kg) | user input |
height | Height (cm) | user input |
Step-by-step method
- Validate the required age/body/calendar/reading inputs and their units.
- Apply the documented mifflin-st jeor resting energy estimate relationship to the entered values.
- Interpret the output as an estimate or tracking summary and use appropriate clinical guidance for diagnosis, treatment, pregnancy dating or individual health decisions.
Worked example
Liam, a person tracking general wellness information, wants a transparent resting-energy estimate from age, sex, height and weight instead of treating an unexplained fitness-app number as a measured metabolic rate.
Example inputs
- Sex input used by equation: male
- Age (years): 35
- Weight (kg): 78
- Height (cm): 175
Calculation / processing
Use the verified QA fixture: Sex input used by equation: male; Age (years): 35; Weight (kg): 78; Height (cm): 175.Apply the production mifflin-st jeor resting energy estimate workflow exactly as described on this page.The production QA fixture reports: BMR/REE estimate: 1,704 kcal/day - Mifflin-St Jeor.
The result is the verified Build 0227 output for this exact scenario. It should be interpreted with the displayed inputs, assumptions and limitations rather than as context-free advice.
Assumptions
- The entered values are accurate measurements/dates and fall within the intended population or use case of the cited method.
- The result is an estimate or summary; individual physiology, measurement conditions and clinical context can materially change interpretation.
Limitations
- This ToolLott page is not a diagnostic device and does not provide medical advice, diagnosis or treatment recommendations.
- Seek appropriate healthcare advice for symptoms, abnormal readings, pregnancy/fertility decisions, medication/exercise safety or results that are inconsistent with your circumstances.
Common questions
What does the BMR Calculator actually do?
Estimate resting energy expenditure with the Mifflin-St Jeor predictive equation using age, sex input, height and weight. The methodology documents the production calculation or transformation rather than a generic description.
Does the worked example match the real ToolLott tool?
Yes. It is tied to the passed production QA fixture for Build 0227, including the expected summary.
What should I verify before relying on the output?
Check the entered values, stated assumptions, support boundaries and any authoritative sources linked on the page; independently review high-stakes use.
Methodology sources
Related ToolLott tools
A realistic way Liam could use this tool
Liam is a person tracking general wellness information.
Liam wants a transparent resting-energy estimate from age, sex, height and weight instead of treating an unexplained fitness-app number as a measured metabolic rate.
Liam enters male, age 35, 78 kg and 175 cm. The calculator applies the Mifflin-St Jeor equation: 10×78 + 6.25×175 - 5×35 + 5.
The equation returns about 1,704 kcal/day as the BMR/REE estimate. Liam can see exactly where the number comes from and compare scenarios, while understanding that a predictive equation is not a laboratory measurement.
Fictional scenario using realistic example data. For Ready tools, the worked result is tied to the tested example shown in the tool. Replace the figures with your own inputs and independently verify important professional, financial, legal, health or safety decisions.
What this calculator is for
Use it to estimate resting energy expenditure with the Mifflin-St Jeor predictive equation using age, sex input, height and weight.
It sits within ToolLott’s Health Calculators collection, where you can also calculate BMI, BMR, body fat, calorie needs, heart-rate zones, ovulation dates and pregnancy dates for general information.