How to lose 40 lbs in 12 weeks
To lose 40 lbs in 12 weeks, a typical 30-year-old male (5'9", 176.4 lbs, sedentary) burning about 2099 calories per day would need to eat approximately 800 calories per day.
Note for men: This goal may be too aggressive for healthy weight loss. A safe rate of loss for men is typically 0.5-1 kg (1-2 lbs) per week.
A typical 30-year-old female (5'3", 132.3 lbs, sedentary) burning about 1547 calories per day, would need to eat approximately 800 calories per day.
Note for women: This goal may be too aggressive for healthy weight loss. A safe rate of loss for women is typically 0.5-0.75 kg (1-1.5 lbs) per week.
These are rough estimates. Your actual calorie needs depend on your age, gender, height, weight, and activity level. Use the calculator below to get a personalized estimate.
Enter your parameters below to get a personalized estimate
Adjust the parameters below to see projections based on your own body metrics.
To lose 40 lbs in 12 weeks, you would need to eat approximately 325 calories per day, given your TDEE of 2099 kcal/day. After reaching your goal, your maintenance intake would be approximately 1881 kcal/day.
Warning: Eating below 1,200 kcal/day is generally not recommended without medical supervision. Consider a longer timeframe — at 1,200 kcal/day it would take approximately 5.5 months.
Estimated from your parameters
2099 kcal/day
| Daily Calories | 1 Week | 2 Weeks | 1 Month | 3 Months |
|---|---|---|---|---|
| 325 kcalYour goal (-85%) | 172.8 lbs | 169.3 lbs | 161.4 lbs | 133.6 lbs |
| 1679 kcal-20% | 175.5 lbs | 174.6 lbs | 172.8 lbs | 166.2 lbs |
| 1889 kcal-10% | 175.9 lbs | 175.5 lbs | 174.6 lbs | 171.3 lbs |
| 2099 kcalMaintenance | 176.4 lbs | 176.4 lbs | 176.4 lbs | 176.4 lbs |
| 2308 kcal+10% | 176.8 lbs | 177.3 lbs | 178.1 lbs | 181.4 lbs |
| 2518 kcal+20% | 177.3 lbs | 178.1 lbs | 179.9 lbs | 186.5 lbs |
This calculator is for informational purposes only and is not medical advice. Always consult a doctor or healthcare provider before making changes to your diet.