How we worked it out
Updated as you change the numbers.
- To lose: 20 lb.
- Using about 3,500 kcal per pound: weekly loss = daily deficit × 7 ÷ 3,500.
- Weeks = pounds to lose ÷ pounds a week.
Method and assumptions
The 3,500-calories-per-pound rule is a simple approximation that overstates long-term loss, because a smaller body burns fewer calories. Treat the date as the earliest likely date. A pace of 1 to 2 pounds a week is the usual guidance.
Questions
How long does it take to lose 20 pounds at 1 pound a week?
20 weeks, with a daily deficit of about 500 calories.
Sources
Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.