Calorie Calculator
Estimate your BMR and daily calorie needs from your activity level.
BMR Calculator
Estimate the calories your body uses at complete rest from your age, sex, height and weight.
Under 30 seconds
Updated 24 Sept 2026
Results
Estimated BMR
1,618 kcal/day
Estimated energy used per day at complete rest — an estimate, not a prescription.
- Method
- Mifflin-St Jeor equation
Height used
170 cm
Weight used
70 kg
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</iframe>BMR shown here is an estimate based on a standard formula. Individual metabolism varies with body composition, health conditions, medication and other factors, and this figure is not medical or dietary advice.
This BMR calculator estimates your basal metabolic rate — the energy your body uses at complete rest over 24 hours — with the Mifflin-St Jeor equation. BMR excludes movement and exercise; to estimate total daily calorie needs, use the Calorie Calculator. The result is an estimate, not medical advice.
Visual breakdown
A visual view of your calculation.
Interactive charts arrive here soon.
Smart Insights
Generated from the numbers you entered — no guesswork.
- Your body is estimated to use about 1,618 kcal/day at complete rest, before any movement, work or exercise is added.
- Daily calorie needs are higher than BMR because everyday activity adds to it — the Calorie Calculator applies an activity multiplier to estimate that total.
- BMR shown here is an estimate based on a standard formula. Individual metabolism varies with body composition, health conditions, medication and other factors, and this figure is not medical or dietary advice.
What is the BMR Calculator?
What the tool does, who it is for and what it cannot tell you.
BMR (basal metabolic rate) is the estimated energy your body needs to stay alive at complete rest — breathing, circulation, temperature control and cell repair — over 24 hours.
BMR is different from daily calorie needs. Daily needs (often called TDEE) add the energy used by walking, working, exercising and digesting food, so they are always higher than BMR.
How does the BMR Calculator work?
Each step the calculator runs, in plain language.
- 1
Enter your details
Age, sex, height and weight; units are converted for you.
- 2
Apply the equation
The Mifflin-St Jeor formula combines them into a resting energy estimate.
- 3
Read your BMR
The result is shown in kcal per day, rounded to whole calories.
What to enter in each field
The exact figure each input expects, so the result means what you think it means.
- Units
- Choose the combination matching your measurements. Height boxes for units you are not using are ignored.
- Sex
- The equation uses a different constant for males and females (+5 and −161).
- Age, height, weight
- Realistic adult values only; decimals are accepted.
BMR Calculator formula
The exact maths behind every number on this page.
BMR (Mifflin-St Jeor) = 10 × weight (kg) + 6.25 × height (cm) − 5 × age + s, where s = +5 for males and −161 for females
- weight (kg)
- Body weight in kilograms (pounds converted at 1 lb = 0.45359237 kg)
- height (cm)
- Height in centimetres (1 inch = 2.54 cm)
- age
- Age in completed years
- s
- Sex constant: +5 for males, −161 for females
Mifflin-St Jeor is a widely used standard equation for estimating resting energy use in adults. It is the same method used by the CalPaisa Calorie Calculator.
BMR Calculator calculation example
Hypothetical example: a 30-year-old female, 160 cm tall, 60 kg.
- 110 × weight10 × 60 = 600
- 26.25 × height6.25 × 160 = 1,000
- 3−5 × age−5 × 30 = −150
- 4Female constant−161
- 5BMR600 + 1,000 − 150 − 161 = 1,289 kcal/day
The estimated BMR is about 1,289 kcal/day. All figures here are hypothetical.
Important assumptions
What this calculation includes, and what it leaves out.
- Uses the Mifflin-St Jeor equation, a standard estimate for adults.
- Unit conversions use 1 inch = 2.54 cm and 1 lb = 0.45359237 kg.
- Not adjusted for pregnancy, illness, medication or athletic body composition.
- BMR shown here is an estimate based on a standard formula. Individual metabolism varies with body composition, health conditions, medication and other factors, and this figure is not medical or dietary advice.
Financial tips
Practical guidance to act on your result.
- Use the Calorie Calculator next if you want an estimate that includes your activity level.
- BMR is a population-based estimate; muscular people often use more energy than the formula suggests.
- Speak to a qualified doctor or registered dietitian before making significant changes to how you eat.
Frequently asked questions
Short, direct answers to the questions we hear most.
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Disclaimer
CalPaisa calculators are for general information and planning only. Results are estimates based on the values you enter and standard formulas, and may differ from the figures your bank, employer, or tax authority applies. Nothing here is investment, tax, or legal advice. Please confirm important decisions with a qualified professional. Read our financial disclaimer, learn how CalPaisa works, or tell us about a calculation you think is wrong.