This section explains the rule behind the result in plain language.
CalcBeacon tool
BMR Calculator
Estimate basal metabolic rate with the Mifflin-St Jeor equation using age, sex, weight, and height.
Enter your numbers
Formula: Mifflin-St Jeor equation
Result
Health result panel
Main result
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Per day—
Per week—
How to read the BMR Calculator result
BMR is a baseline estimate of how many calories your body may use at rest before activity, exercise or daily movement are added.
Specific formula
- Mifflin-St Jeor male: BMR = 10 × weight kg + 6.25 × height cm − 5 × age + 5
- Mifflin-St Jeor female: BMR = 10 × weight kg + 6.25 × height cm − 5 × age − 161
Example interpretation
Example: a 32-year-old male at 78 kg and 178 cm gives about 1,745 kcal/day before activity. The final maintenance number will be higher once activity is included.
Common mistakes
- Treating BMR as a daily eating target instead of a resting baseline.
- Using old weight or guessed height, which can noticeably change the estimate.
- Comparing results across formulas without checking which equation was used.
Use BMR as a starting point for planning, not a medical or performance diagnosis.
Quick answer
BMR Calculator: BMR Calculator helps turn health and body metrics inputs into a clear result you can compare, explain, and use for a practical decision.
Use this example as a quick check on how the inputs affect the answer.
Checking this point helps prevent a misleading result.
How to interpret the result
BMR is a baseline estimate before exercise and daily movement are added.
Methodology
This page uses the values you enter, applies the arithmetic for bmr calculator, and displays the result immediately in the result panel. The page keeps the answer, formula, example and explanation together so the calculation is easier to verify and easier for search systems to understand.
Reviewed by CalcBeacon Editorial TeamUpdated May 2026Category: Health CalculatorsTransparent formula and example
How this calculator works
Estimate basal metabolic rate with the Mifflin-St Jeor equation using age, sex, weight, and height.
Method
Use the inputs to calculate the result instantly based on the values entered.
Example
Enter values that match your real scenario in each field, then compare the output and adjust the inputs to test a second scenario.
Frequently asked questions
What does the bmr calculator show?
It shows the budget result from the income, spending and savings values entered on this page.
Is this bmr calculator free to use?
Yes. CalcBeacon tools are designed for quick free use in the browser.
How to use the bmr calculator
Estimate basal metabolic rate with the Mifflin-St Jeor equation using age, sex, weight, and height. Use this page for a quick estimate, compare a few scenarios, and adjust the inputs until the result matches what you need to decide.
This tool also sits inside the CalcBeacon health cluster. That makes it easier to find from category pages, related tools, and supporting guides when you want to compare options.
When it is usefulUse this tool when you want a quick estimate, want to compare options, or want a clearer answer before moving on.
Common mistakesCheck that your numbers use the same units, avoid leaving key fields blank, and test a second scenario so you can see how sensitive the final result is.
Next useful stepAfter using this page, compare the result with a related calculator or open the guide to check the number in context.
Related tools
Use these related tools to compare nearby calculations and move to the next step faster.