Calorie Deficit Calculator
Free online calorie deficit calculator that runs entirely in your browser.
How the Calorie Deficit Calculator works
The Calorie Deficit Calculator works on Maintenance calories (TDEE), Weight to lose (kg), Weeks to do it in and shows the result as you type. The same input always gives the same answer — refresh the page and you will see exactly the same figure.
Formula used
Calorie Deficit Calculator is computed by the formula below, using the inputs you provide.
Inputs used: Maintenance calories (TDEE), Weight to lose (kg), Weeks to do it in.
Worked example
Take the default example — maintenance calories (tdee) of 2200:
- Daily calorie target: 2,063
- Daily deficit needed: 138
- Pace is too aggressive: false
- weeklyLoss: 0.13
Frequently asked questions
- Is the Calorie Deficit Calculator free?
- Yes. There is no signup, no usage limit and no watermark — the calculator runs entirely in your browser.
- Does the Calorie Deficit Calculator store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.
- What inputs does the Calorie Deficit Calculator need?
- Maintenance calories (TDEE), Weight to lose (kg), Weeks to do it in. Change any of them and the result updates instantly.