Free · Instant · Shows the math
How Long Will It Take to Lose Weight
The weeks and target date to lose the weight at your chosen rate.
Results
- Time to goal
- 40 weeks
- Target date
- 2027-04-24
- Daily deficit
- 551 kcal
| Lose | Weeks | Date |
|---|---|---|
| 10 lb (5 kg) | 10 weeks | 2026-09-20 |
| 20 lb (9 kg) | 19 weeks | 2026-11-23 |
| 30 lb (14 kg) | 28 weeks | 2027-01-25 |
| 40 lb (18 kg) | 37 weeks | 2027-03-30 |
| 50 lb (23 kg) | 46 weeks | 2027-06-01 |
| 80 lb (36 kg) | 73 weeks | 2027-12-09 |
| 100 lb (45 kg) | 91 weeks | 2028-04-14 |
Dates assume a steady rate; real loss slows as you approach your goal.
At a safe 1–2 lb (0.45–0.9 kg) per week, losing 20 lb takes 10–20 weeks. The timeline is the amount to lose divided by your weekly rate.
This calculator returns the weeks and a target date, plus presets from 10 to 100 lb.
How to calculate a weight loss timeline
To calculate a weight loss timeline, divide the pounds to lose by your weekly rate. Slower rates protect muscle and adherence.
Worked example: 30 lb at 1.5 lb per week takes 20 weeks.
Frequently asked questions
About 15–30 weeks at a safe 1–2 lb per week. Faster targets risk muscle loss and rebound.
Roughly 12–24 months at 1–2 lb per week. Larger bodies often lose faster early, then slow.
Yes, modestly. Add protein, resistance training, and steps rather than cutting calories below the safe floor.
Results are estimates based on population averages and are not medical advice. Consult a doctor or registered dietitian nutritionist (RDN) before making large changes to your diet, especially for deficits over 2 lb (0.9 kg) per week, during pregnancy or nursing, or for anyone under 18.