Calories per day by weight and activity
A 20-year-old man, 5 ft 9 in tall.
| Weight | Sedentary | Light | Moderate | Very active |
|---|---|---|---|---|
| 120 lb | 1,854 | 2,124 | 2,394 | 2,665 |
| 140 lb | 1,962 | 2,249 | 2,535 | 2,821 |
| 160 lb | 2,071 | 2,373 | 2,675 | 2,978 |
| 180 lb | 2,180 | 2,498 | 2,816 | 3,134 |
| 200 lb | 2,289 | 2,623 | 2,957 | 3,291 |
| 220 lb | 2,398 | 2,748 | 3,097 | 3,447 |
| 240 lb | 2,507 | 2,872 | 3,238 | 3,604 |
| 260 lb | 2,616 | 2,997 | 3,379 | 3,760 |
Calories to lose weight at 20
| Weight | Lose 1 lb/week | Lose 0.5 lb/week |
|---|---|---|
| 120 lb | 1,624 | 1,874 |
| 140 lb | 1,749 | 1,999 |
| 160 lb | 1,873 | 2,123 |
| 180 lb | 1,998 | 2,248 |
| 200 lb | 2,123 | 2,373 |
| 220 lb | 2,248 | 2,498 |
| 240 lb | 2,372 | 2,622 |
| 260 lb | 2,497 | 2,747 |
Lightly active. Never below 1,500 kcal without medical supervision.
How age changes it
Each extra decade lowers resting burn by about 50 calories in the Mifflin-St Jeor equation, all else equal. Muscle matters more: strength training and enough protein help keep your burn up as you age.
How to use it
- Enter your numbers. Switch between US and metric units at any time.
- Results update as you type, and the formula is shown so you can check it.
- Copy the link, save the plan on this device, or print it for your next appointment.

These are estimates, not a diagnosis. A clinician can account for your health history and medicines.
Nearby ages
Common questions
How many calories should a 20-year-old man eat?
About 2,153 to 2,781 a day at 175 lb, depending on activity, to maintain weight. Your weight and height shift it; see the table.
How many calories should a 20-year-old man eat to lose weight?
Roughly 500 fewer than maintenance for about 1 lb a week, for example 1,967 a day at 175 lb if lightly active.