Calculator
What the Calorie Calculator does
Calorie Calculator: calculates BMR (at rest), Maintain Weight and Lose Weight Target from Your Weight, Your Height and Your Age. Example: your weight 70 kg, your height 170 cm and your age 30 years gives BMR (at rest) 1,617.5.
Point it at Your Weight, Your Height, Your Age and Sex and it returns BMR (at rest), Maintain Weight and Lose Weight Target. Each change is reflected immediately, which suits quick what-if comparisons.
A single number is most useful as a trend over time rather than a one-off judgement. The Calorie Calculator exists to take that particular chore off your hands.
Everything happens inside this page. Nothing you type is sent to a server, and there is nothing for us to store.
The sections that follow cover the fields, the method, and one full example computed from the defaults.
What do the Calorie Calculator fields mean?
The Calorie Calculator uses 5 inputs. Starting values are already in place, which saves the usual blank-form hesitation about what a field wants.
| Field | What to enter | Default |
|---|---|---|
| Your Weight | measured in kg | 70 |
| Your Height | measured in cm | 170 |
| Your Age | measured in years | 30 |
| Sex | choose from Male or Female | Male |
| Daily Activity Level | choose from Sedentary (desk job, little exercise), Lightly active (1 to 3 days/week), Moderately active (3 to 5 days/week), Very active (6 to 7 days/week) or Extra active (hard training / physical job) | Sedentary (desk job, little exercise) |
How does the Calorie Calculator work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same calculation.
Values are checked first: an out-of-range or non-numeric entry names the offending field instead of returning nonsense.
Worked example
These are the values the Calorie Calculator loads by default, and the result it produces from them. The figures are the tool’s live defaults and its live output, so you can reproduce them exactly.
| Your Weight | 70 kg |
|---|---|
| Your Height | 170 cm |
| Your Age | 30 years |
| Sex | Male |
| Daily Activity Level | Sedentary (desk job, little exercise) |
| BMR (at rest) | 1,617.5 |
|---|---|
| Maintain Weight | 1,941 |
| Lose Weight Target | 1,441 |
| Gain Weight Target | 2,441 |
| What this means | Eat near 1941 kcal/day to maintain. ~500 kcal less/day is a common gradual weight-loss pace; ~500 more for slow gain. |
Read next: BMR and TDEE: Why Every Calculator Gives You a Different Number
How to use it
- Enter Your Weight in kg.
- Set Your Height in cm.
- Put Your Age in years.
- Pick a value for Sex: the options are Male or Female.
- Pick a value for Daily Activity Level: the options are Sedentary (desk job, little exercise), Lightly active (1 to 3 days/week), Moderately active (3 to 5 days/week), Very active (6 to 7 days/week) or Extra active (hard training / physical job).
- Because it recalculates as you type, you can dial a value in rather than guessing and re-running.
- You get BMR (at rest), Maintain Weight, Lose Weight Target, Gain Weight Target and What this means back.
- The link encodes your inputs, so saving it is enough to reproduce the result later.
What this tool does not do
- Body composition, ethnicity and age all shift what a "normal" result means.
- These formulas come from population averages and cannot account for your medical history.
- The result reflects the moment you ran it; anything that changes over time is not tracked.
- Results are only as good as the inputs. Check your units before reading anything into the output.
Frequently asked questions
Enter Your Weight in kg, Your Height in cm and Your Age in years. Look for the unit beside each label; the result is reported in a stated unit as well.
With the values loaded when the page opens, BMR (at rest) comes out as 1,617.5. That number tracks the inputs, so a small edit shows its sensitivity immediately.
Nothing leaves your machine. The only network traffic is loading the page itself.
Free, and there is no upsell. The whole tool is the free version.
Reliable as a rule of thumb, unreliable as a verdict. Equations of this kind are fitted to large groups, and the spread around the fitted line is wide enough that any individual can sit well off it.