Weight Loss Calculator
How long to reach your goal at your chosen daily deficit. Honors the 7700-kcal-per-kg rule of thumb and gives a date.
Scan to open on your phone
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How long to reach your goal at your chosen daily deficit. Honors the 7700-kcal-per-kg rule of thumb and gives a date.
How to use Weight Loss Calculator
- Open the toolNo signup and nothing to install; it works as soon as the page loads.
- Set “Current weight (kg)”
- Set “Target weight (kg)”
- Set “Daily deficit (cal)”
- Set “Weeks planned”
- Read the resultChange any input and the result is recalculated immediately.
Worked example with the defaults
- TIME TO LOSE 10 KG · At a 500 kcal/day shortfall
- 22 weeks
Nothing you enter leaves your device
All of the work happens inside your browser. Whatever you type is never packaged up and sent to a server, and no request this page makes carries it.
That makes it safe for contract amounts, personal details and internal documents you would rather not hand to a third party — close the tab and it is gone.
What this tool does not do
Weight Loss Calculator only does what a browser can do on its own — it talks to no backend service. So it keeps no history for you and syncs nothing across devices; if you need a record, copy or download the result.
It is also not a substitute for professional judgement. For legal, medical or tax decisions, treat the output as a starting point rather than a final answer.
Frequently Asked Questions
- Is 7700 kcal per kg accurate?
- It is the standard estimate for stored body fat, which is energy-dense. Real-world results vary by a few percent with activity and water.