BMR Calculator
What your body spends before you do anything.
FREE - NO SIGN-UP - RUNS ON YOUR DEVICE
Nothing you enter leaves this tab
- BMRresting figure
- TDEEalso shown
- Freeno account needed
- 0data uploaded
What you can count on
- Restis the floor
- What the body costs doing nothing
- Activity sits on top of it
- 0uploads
- Height and weight stay in this tab
- Nothing is stored
- Est.not medical advice
- A general figure from a formula
- Not a target and not a diagnosis
BMR Calculator at a glance
- Input
- Age, sex, height and weight
- Output
- Resting figure and daily total
- What it is not
- Not an intake target
- Health notice
- Estimate, not medical advice
- Processing
- Runs locally in your browser
- Formula used
- Mifflin-St Jeor (+5 / −161)
- Activity multipliers
- 1.2 → 1.9, default 1.375
- Price
- Free
- Account required
- No
How to use BMR Calculator
- 1
Enter your measurements
Age, sex, height and weight, in whichever units the panel is set to.
- 2
Pick an activity level
Only the whole-day figure uses it. The resting number does not change with it.
- 3
Read the resting figure
It appears first, with the whole-day total next to it, and both update live.
Frequently asked questions
What is a basal metabolic rate?
The energy a body uses lying still and awake, keeping itself running. For most people it is the largest single piece of a day's total, and the part you do not choose.
Should I eat my BMR?
It is not an intake target and this panel does not present it as one. Eating plans belong with a qualified health professional who knows your circumstances.
Why does the activity level change one number and not the other?
Activity scales the resting figure into the whole-day total. The resting figure itself comes from age, sex, height and weight alone.
Where does the calculation happen?
In this browser tab. Your height, weight and age are not sent to a server and nothing is kept once the page closes.
What the resting figure covers
Age, sex, height and weight give the resting figure. An activity level is asked for as well, because the panel puts the whole-day number beside it.
- Breathing, circulation, temperature and repair — the running costs of a body that is doing nothing else.
- It moves with size and age, which is why the same formula gives different people very different floors.
- The whole-day number is this figure scaled by activity, so an error here carries into that one.
Full specification
| Input | Age, sex, height and weight. An activity level too, for the whole-day figure. |
|---|---|
| Output | A resting energy estimate, with the whole-day total displayed alongside. |
| What it is not | Not a calorie target. The resting figure describes a body at rest and nothing else. |
| Health notice | This result is an estimate for general information and is not medical advice. |
| Processing | All calculations run locally in the current browser tab. |
| Formula used | Mifflin-St Jeor, with plus 5 for men and minus 161 for women. Every other row on this page is built from that figure. |
| Activity multipliers | 1.2 sedentary, 1.375 lightly active, 1.55 moderately, 1.725 very, 1.9 extra. The box starts on 1.375, not sedentary. |
| Price | Free |
| Account required | No |
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