Quick answer
BMR Calculator: what it calculates
BMR Calculator calculates estimated bmr from sex, age and weight. The core method is BMR = 10 x weight kg + 6.25 x height cm - 5 x age + 5 for men or -161 for women.
Health Calculators
BMR Calculator
Use this BMR calculator to estimate resting daily calorie needs before activity is added.
Reviewed May 25, 2026EstimateFormula shown
ResultEstimated BMR
InputsSex, Age, Weight, Height
FormulaMifflin-St Jeor equation
Live calculator
BMR calculator
Estimated BMR1,460 calories/day
Estimated resting energy needs before activity is added.
Metric inputs74.8 kg
167.6 cm used in the Mifflin-St Jeor equation.
Planning note
BMR is not the same as maintenance calories. Most people need more than BMR because daily movement, exercise, and digestion add energy needs.
Formula
Mifflin-St Jeor equation
BMR = 10 x weight kg + 6.25 x height cm - 5 x age + 5 for men or -161 for womenBMR is an estimate of resting energy needs before activity is added.
How to use
Steps
- Choose sex.
- Enter age, weight, and height.
- Review estimated resting calories per day.
- Use TDEE, not BMR alone, for maintenance calorie planning.
Example
Sample calculation
Profile35-year-old female
Height and weight5 ft 6 in, 165 lb
BMRAbout 1,455 calories/day
Calculator use
Best for
- Quick estimated bmr from sex, age and weight.
- Wellness, nutrition, pregnancy, or fitness planning when a rough estimate is enough.
- Scenario comparisons before changing calorie, macro, or body-measurement assumptions.
- Planning alongside professional medical or nutrition advice, not as a diagnosis.
Before relying on it
Check first
- Entering sex, age and weight from different time periods or scenarios.
- Treating a calculator result as medical advice or a diagnosis.
- Using stale body, activity, pregnancy, or nutrition inputs when your situation has changed.
- Ignoring context such as age, medication, training status, medical history, or professional guidance.
Details
What to know before using the result
These notes make the assumptions explicit, especially where the same search query can mean slightly different things.
Resting estimateBefore activity
BMR is lower than total daily energy expenditure because it excludes most movement and exercise.
Formula inputsMetric conversion
The calculator converts pounds to kilograms and inches to centimeters before applying the equation.
Accuracy limitPopulation equation
Individual metabolism can differ from equation estimates because of body composition, hormones, illness, medications, and training.
Benchmarks
How to read the result
The calculator is a decision aid, not a fixed rule. Use the output to compare scenarios and document your assumptions.
BMRResting calories
Energy estimate before activity adjustment.
TDEEBMR x activity
Better for maintenance calorie planning.
Tracked intakeReality check
Real weight trends are useful for adjusting equation estimates.
Calculator accuracy
Methodology and assumptions
The formula, inputs, example, and limitations are shown so the result is checkable, not just a number in a box.
Formula
BMR = 10 x weight kg + 6.25 x height cm - 5 x age + 5 for men or -161 for women
Inputs used
Sex, Age, Weight, Height
Limitations
Results are estimates for quick planning and should be checked before important financial, legal, tax, health, or business decisions.
Last reviewed
May 25, 2026
Cite this page
Toolkit Shelf. BMR Calculator. Retrieved May 25, 2026, from https://toolkitshelf.com/tools/bmr-calculator
FAQ
Common questions
What is BMR?
BMR is an estimate of calories your body uses at rest before daily activity is added.
Is BMR the same as maintenance calories?
No. Maintenance calories usually mean total daily energy expenditure, which adds activity to BMR.
Which BMR formula does this use?
It uses the Mifflin-St Jeor equation with weight in kilograms and height in centimeters.