Quick start
- Open the BMR Calculator.
- Enter age in years, formula sex, height in centimeters, and weight in kilograms.
- Use the first example, "Male 1,763 kcal: 35-year-old male, 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
Start here if one of these sounds like your job. The examples below show which inputs matter most.
- Estimate resting energy needs before activity is added.
- Separate BMR from TDEE and calorie targets.
- Understand how height, weight, age, and formula sex affect the estimate.
- Use BMR as the base input for TDEE and calorie planning tools.
What this calculator is for
The BMR Calculator estimates the calories your body may use at rest with the Mifflin-St Jeor equation. It does not include exercise, work, steps, or daily movement until an activity factor is added.
Use it when you want to: Estimate resting energy needs before activity is added. Separate BMR from 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 in years, formula sex, height in centimeters, and weight in kilograms.
- Use current measurements for today, or the same measurement routine if comparing changes over time.
- Remember what the formula sex setting does: it chooses the +5 or -161 Mifflin-St Jeor adjustment. It does not describe your whole body or health picture.
Example walkthrough
Try the calculator example: Male 1,763 kcal: 35-year-old male, 178 cm, 82 kg. The example result is About 1,763 kcal/day BMR.
- For a 35-year-old male at 178 cm and 82 kg, the estimate is 10 x 82 + 6.25 x 178 - 5 x 35 + 5, or about 1,763 kcal/day.
- For a 29-year-old female at 164 cm and 61 kg, the same structure uses the -161 adjustment and returns about 1,329 kcal/day.
- If the 1,763 kcal BMR example is multiplied by the moderate activity factor of 1.55, the TDEE context is about 2,732 kcal/day. That is why BMR and daily calorie needs are not the same number.
Formula and steps
In plain language: BMR uses the Mifflin-St Jeor equation: 10 x weight kg + 6.25 x height cm - 5 x age + 5 for the male formula setting, or -161 for the female formula setting. Read the result together with the notes on the page, because health and fitness numbers often need personal context.
Read the formula note when you need to understand where the number came from, especially before comparing results over time.
How to read the answer
Read the main estimate first, then read the note beside it. For health, pregnancy, nutrition, kidney, alcohol, or training decisions with real consequences, use qualified professional guidance.
- A higher BMR estimate usually reflects larger body size, taller height, younger age, or the formula sex setting.
- Read the BMR line as resting energy only. The sedentary and moderate TDEE lines show what happens after broad activity factors are added.
- Use BMR as a starting point, then move to TDEE Calculator or Calorie Calculator for daily planning.
Common mistakes to avoid
Most bad results come from a small input mistake or from using a rough estimate for a decision it cannot safely answer.
- 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 pregnancy, child, eating-disorder, medical, or sports-nutrition advice.
What to try next
A related health tool can help check the same topic from another angle, but one number should not replace proper care.
- Use TDEE Calculator to add activity.
- Use Calorie Calculator to compare maintenance and goal estimates.
- Use Macro Calculator only after you have a calorie target you trust enough to split into protein, fat, and carbohydrate grams.
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.
Worked examples for BMR Calculator
About 1,763 kcal/day BMR
About 1,329 kcal/day BMR
About 2,732 kcal/day TDEE
FAQ in plain language
When should I use the BMR Calculator?
Use it for simple educational checks, trend tracking, or planning tasks like these: Estimate resting energy needs before activity is added. Separate BMR from TDEE and calorie targets. It can help you understand a number, but it cannot explain your whole health situation.
What do the main BMR Calculator inputs mean?
Enter formula sex, age in years, height in centimeters, and weight in kilograms. The formula sex setting chooses the +5 or -161 Mifflin-St Jeor adjustment; it is a calculator input, not a full description of your body, health, or nutrition needs.
What is the BMR Calculator doing with my inputs?
In plain language: BMR uses the Mifflin-St Jeor equation: 10 x weight kg + 6.25 x height cm - 5 x age + 5 for the male formula setting, or -161 for the female formula setting. Read the result together with the notes on the page, because health and fitness numbers often need personal context.
How should I read the BMR Calculator result?
Read BMR as an estimated resting-energy number in kcal per day. It is lower than total daily needs for most adults because it does not include walking, work, exercise, or daily movement. Use the sedentary and moderate TDEE lines as context before making calorie plans.
Is BMR the same as TDEE?
No. BMR estimates resting energy before activity is added. TDEE estimates total daily energy expenditure after an activity factor is applied. For example, a 1,763 kcal/day BMR becomes about 2,115 kcal/day with the sedentary factor and about 2,732 kcal/day with the moderate factor.
Should I eat exactly my BMR?
Usually no. BMR is a resting-energy estimate, not a meal plan. Most adults burn more than BMR across a full day because movement, work, training, and daily tasks add energy use.
Why does the formula sex setting change the BMR result?
The Mifflin-St Jeor equation uses one adjustment for the male formula setting and another for the female formula setting. That is a formula choice, not a complete judgment about body composition, hormones, health history, or personal nutrition needs.
Related tools
- TDEE Calculator Estimate daily maintenance calories from BMR and activity level.
- Calorie Calculator Estimate daily calories from BMR, activity level, and goal.
- Macro Calculator Split daily calories into protein, fat, and carbohydrate grams.
Keep exploring
If this guide is close but not exact, these links keep you near the same kind of problem.
- Health & Fitness Browse the full category for related tools that help with the same job.
- All free tools Search the complete Access Free Tools library by task, category, or tool name.
- All calculator and utility guides Find more plain-language examples, formulas, mistakes, and result explanations.
- Free calculator resources Start here when you are not sure which calculator page fits.
Privacy and copying results
Recent answers stay visible only while you work in the current browser tab. They are not sent to a server.
Use Copy answer when you want to save the inputs and result in notes, homework, a message, or a project list. Check the units, labels, and limits before copying.