Weight loss calculator
Calculator
The calculator needs JavaScript. The tables below give the same numbers for common cases.
How it is worked out
- Weeks = (current − goal) ÷ weekly loss = 10 ÷ 0.5 = 20.
- About 7,700 kcal per kg of body weight (3,500 per lb) is the common approximation: 0.5 kg a week ≈ 550 kcal a day.
- Weight loss is rarely linear. A steady 0.25 to 1 kg a week is commonly considered a gradual pace; ask a professional for advice that fits your health.
| Inputs | Answer |
|---|---|
| Current weight: 85; Goal weight: 75; Loss per week: 0.5; Start date: 2026-01-05 | Losing 10 kg at 0.5 kg a week takes about 20 weeks, reaching your goal around Monday, May 25, 2026. |
| Current weight: 70; Goal weight: 62; Loss per week: 0.25; Start date: 2026-03-01 | Losing 8 kg at 0.25 kg a week takes about 32 weeks, reaching your goal around Sunday, October 11, 2026. |
| Current weight: 110; Goal weight: 90; Loss per week: 0.75; Start date: 2026-06-01 | Losing 20 kg at 0.75 kg a week takes about 26.7 weeks, reaching your goal around Saturday, December 5, 2026. |
How to use it
Weeks to goal = (current weight − goal weight) ÷ weekly loss. Losing 10 kg at 0.5 kg a week takes 20 weeks. The calculator also gives the goal date and the approximate daily calorie deficit, using the common 7,700 kcal per kilogram approximation.
A steady 0.25 to 1 kg a week is commonly described as a gradual pace. Real progress is uneven, so use it as a plan, not a promise. This is general information and an estimate, not medical advice; talk to a healthcare professional about your own situation.
Frequently asked questions
How long will it take to lose 10 kg?
At 0.5 kg a week, 20 weeks.
How many calories is 0.5 kg a week?
About 550 kcal a day by the 7,700 kcal per kg approximation.
Is faster better?
Not necessarily; very fast loss is hard to keep and can be unhealthy.
Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.
About · How we verify this · Editorial policy · Corrections
General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.