Quick start
- Open the BMR Calculator.
- Enter age, formula sex, height, and weight.
- Use the first example, "Male example: 35, 178 cm, 82 kg", if you want to see a filled-out calculation before entering your own values.
- Calculate, read the formula line, then copy the result only after the units and assumptions look right.
Best uses
Use this guide when one of these tasks matches what you are trying to do.
- Estimate resting energy needs before activity is added.
- Compare BMR with TDEE and calorie targets.
- Understand how height, weight, age, and formula sex affect the estimate.
- Use as the base for nutrition planning tools.
What this calculator is for
The BMR Calculator estimates the calories your body may use at rest. It does not include exercise, work, steps, or daily movement until another activity factor is added.
Use it when you want to: Estimate resting energy needs before activity is added. Compare BMR with TDEE and calorie targets.
What to enter
Good answers start with clean inputs. Before calculating, check the labels, units, and dates so the tool is solving the same problem you actually have.
- Enter age, formula sex, height, and weight.
- Use current measurements for today, or consistent measurements if comparing changes.
- Keep BMR separate from TDEE: BMR is rest, TDEE is rest plus activity.
Example walkthrough
Try the calculator example: Male example: 35, 178 cm, 82 kg. The example result is BMR estimate.
- For a male example, the formula adds the weight and height terms, subtracts the age term, then applies the sex adjustment.
- For a female example, the same structure is used with the female adjustment.
Formula and steps
BMR uses the Mifflin-St Jeor equation: 10 x weight kg + 6.25 x height cm - 5 x age + sex adjustment.
The formula line on the calculator page is there so the answer is not a mystery. Read it when you need to understand where the number came from.
How to read the answer
Use the result as an educational estimate. For health, pregnancy, nutrition, kidney, alcohol, or training decisions with real consequences, get qualified professional guidance.
- A higher BMR estimate usually reflects larger body size, taller height, younger age, or the formula sex setting.
- Use BMR as a starting point, then move to TDEE or Calorie Calculator for daily planning.
Common mistakes to avoid
Most bad calculator results come from a small input mistake or from using a good estimate for the wrong decision.
- Do not eat at BMR just because it appears on the page; daily needs usually include activity.
- Do not compare BMR results across formulas without noting which formula was used.
- Do not use BMR as medical nutrition advice.
What to try next
A related calculator can help check the same topic from another angle instead of relying on one number.
- Use TDEE Calculator to add activity.
- Use Calorie Calculator to compare maintenance and goal estimates.
Sources and safety notes
This guide uses public-health, clinical, or peer-reviewed references where the calculator needs a specific formula or interpretation boundary.
Source links are provided for transparency, but they do not turn the calculator into medical advice or a replacement for professional care.
Examples from the calculator
BMR estimate
BMR estimate
Estimated daily expenditure
Common questions
What can I use the BMR Calculator for?
Use it for quick educational estimates, planning, comparison, and trend checks. Health and fitness results should be interpreted with context, not as a diagnosis.
How does the BMR Calculator calculate the result?
BMR uses the Mifflin-St Jeor equation: 10 x weight kg + 6.25 x height cm - 5 x age + sex adjustment.
Is this medical advice?
No. This page provides an educational estimate only. Talk with a qualified health professional before making medical, pregnancy, nutrition, medication, or safety decisions.
Related tools
- TDEE Calculator Estimate total daily energy expenditure from BMR and activity.
- Calorie Calculator Estimate daily calories from BMR, activity level, and goal.
- Macro Calculator Split daily calories into protein, fat, and carbohydrate grams.
History, privacy, and copying
Recent answers stay visible in the page while you work. The history is kept only in the current browser tab and is not sent to a server.
Copy answer copies the expression and result so you can paste it into notes, homework, a message, or another document.