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BMR Calculator

Calculate Basal Metabolic Rate and daily calorie needs.
What This Calculator Helps You Do
Use the inputs below to test scenarios, compare outcomes, and interpret the result before acting on it.

BMR Calculator is designed to give you a fast answer, but it also provides supporting context such as formulas, worked examples, FAQs, and charts so the result is easier to validate.

For the best result, use realistic input values, review the assumptions in the explanation panels, and compare multiple scenarios if you are planning a decision based on the output.

Decision Context
Page-specific guidance for using this result in a real planning decision.

Use this page to estimate basal metabolic rate so you can understand the calories your body uses at rest before layering on activity or diet targets.

It works well for maintenance planning, weight-change strategy, and comparing how age, sex, size, and activity assumptions affect energy needs.

Treat BMR as a baseline, then test total daily energy needs with realistic activity levels rather than assuming the resting estimate alone should guide intake.

Calculator
Enter your values
Results
BMR (Resting)
1649
kcal/day
TDEE (Maintenance)
1979
kcal/day
Analysis
Interpretation of the current calculator output

Calculation Summary

The current inputs have been processed for the bmr calculator. Review the results panel for the computed output and use the charts tab to compare the current values visually.

How to Read It

The main result shows the direct answer for your current inputs. Supporting sections below explain the method, example, and common questions so the result is easier to interpret.

How to Use

Step-by-step instructions
  1. 1Select gender and unit system.
  2. 2Enter age, height, and weight.
  3. 3Select activity level.
  4. 4The calculator shows your BMR and TDEE.

Mifflin-St Jeor

Calculates energy expenditure at rest based on weight (W), height (H), age (A), and gender adjustment (s).
BMR = 10W + 6.25H - 5A + s

Variables:

WWeight (kg)
HHeight (cm)
AAge (years)

Example

30yo Male

Inputs:

Height:175 cm
Weight:70 kg
Age:30

Steps:

  1. 1.10(70) + 6.25(175) - 5(30) + 5
  2. 2.700 + 1093.75 - 150 + 5
  3. 3.BMR = 1649 kcal
Result:
1649 kcal/day

Frequently Asked Questions

What is BMR?

Basal Metabolic Rate is the number of calories your body burns at complete rest to maintain basic life functions like breathing and circulation.

What is TDEE?

Total Daily Energy Expenditure is your BMR multiplied by an activity factor. It represents the total calories you burn in a day.
In-depth guideBrowse Health calculators
BMR Calculator Guide
Detailed usage notes, assumptions, mistakes to avoid, and related tools.

BMR Calculator helps turn the available inputs into a result that is easier to check, compare, and explain. Calculate Basal Metabolic Rate and daily calorie needs.

Use this page together with BMI Calculator when your question touches related assumptions in the same health workflow. For a nearby workflow, open BMI Calculator.

Formula And Variables
How the calculator turns inputs into an answer.

Mifflin-St Jeor is the main method behind this calculator. The equation is BMR = 10W + 6.25H - 5A + s, and the calculator applies it consistently as you change the inputs.

The most important variables are: W is weight (kg), H is height (cm), A is age (years). Check those values first if the output looks higher or lower than expected.

How To Use The Result
What to compare before acting on the output.

The worked example on this page uses Height = 175 cm, Weight = 70 kg, Age = 30 and produces 1649 kcal/day. Use that example as a quick check for the calculation flow before entering your own values.

For practical use, read the bmr calculator result as a decision-support number. It is strongest when you compare two or more scenarios using the same units and assumptions.

Data Visualization And Analysis
Different chart views answer different questions about the same calculator output.

Best ways to read the charts

Use a bar chart when you need to compare separate result components, a line or area chart when the output changes across steps or time, and a pie-style distribution when every value is part of one total.

When the page shows multiple chart tabs, start with the overview, then check the ranking view to see which value drives the result most strongly.

What the analysis should tell you

Compare the average, range, highest value, lowest value, and dominant contributor before making a conclusion from the main number alone.

If one value contributes most of the total, test that assumption first. If values are spread evenly, the result is usually driven by the full input set rather than a single outlier.

Common Mistakes
  • Do not mix units unless the calculator explicitly converts them for you.
  • Avoid copying a result without checking whether the inputs describe the same time period, measurement system, or scenario.
  • If the answer looks surprising, change one input at a time so you can identify which assumption is driving the output.
When The Result May Be Inaccurate

The result can be inaccurate if inputs use mixed units, rounded source data, outdated rates, or assumptions that do not match the situation being modeled.

Run a second scenario with conservative inputs when the output will affect a purchase, project, health decision, academic answer, or financial plan.

BMR Calculator is an educational planning tool. It should not replace advice from a qualified professional who can review the full context and current rules.

Long-tail Guides For This Calculator
These pages answer more specific versions of the same search intent.
BMR Calculator Mifflin St Jeor

Estimate basal metabolic rate using the Mifflin-St Jeor approach so calorie planning starts from a more explicit resting-energy model.

Related Calculators
Continue through the same topic cluster with crawlable internal links.
BMI Calculator

Calculate your Body Mass Index (BMI) to assess whether your weight is healthy for your height.

Body Fat Calculator

Estimate your body fat percentage using body measurements.

Calorie Calculator

Calculate your daily calorie needs based on activity level, age, and goals.

Pregnancy Due Date Calculator

Calculate your estimated due date based on your last menstrual period.

Additional Questions

How accurate is BMR Calculator?

BMR Calculator is accurate for the formula and inputs shown on the page. Real-world accuracy depends on whether the values you enter are complete, current, and measured in the expected units.

What should I check before using the bmr calculator result?

Check the input units, review the formula section, compare the worked example, and run at least one alternate scenario if the result will support a decision.