Weight Loss Time Calculator
Weight Loss Timeline
Calculate time to reach your goal weight
From Calorie Deficit
Calculate weight loss from a specific daily calorie deficit
Formula
Weeks = Weight to Lose / Weekly Rate | 1 lb fat = ~3,500 calories | Daily Deficit = TDEE - Intake
Frequently Asked Questions
How long does it take to lose 20 pounds?
At a healthy rate of 1-2 lbs per week, losing 20 lbs takes approximately 10-20 weeks (2.5-5 months). At 1 lb/week (500 cal daily deficit), it takes about 20 weeks. At 2 lbs/week (1000 cal deficit), about 10 weeks.
Is it safe to lose 2 pounds per week?
For most overweight individuals, 2 lbs/week is considered the maximum safe rate. This requires a 1000-calorie daily deficit. Faster rates increase risk of muscle loss, gallstones, and nutritional deficiencies. Those with less to lose should aim for 0.5-1 lb/week.
Why does weight loss slow down over time?
As you lose weight, your body requires fewer calories (lower TDEE), reducing your calorie deficit unless you adjust intake or activity. Additionally, metabolic adaptation can reduce TDEE by 5-15% beyond what weight loss alone would predict.
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