BMR
1,354kcal
at rest
Sedentary
1,625kcal
×1.2
Lightly active
1,862kcal
×1.375
Moderately active
2,099kcal
×1.55
Show the math
BMR = 10 × 45.4 kg + 6.25 × 175.3 cm − 5 × 40 + 5 = 1,354 kcal
TDEE = 1,354 × 1.375 = 1,862 kcal/day
TDEE by age and activity
Daily calories burned for a 100 lb man, 5 ft 9 in tall, by age and activity level.
| Age | Sedentary | Lightly active | Moderately active | Very active | Extra active |
|---|---|---|---|---|---|
| Age 20 | 1,745 | 1,999 | 2,254 | 2,508 | 2,763 |
| Age 30 | 1,685 | 1,930 | 2,176 | 2,422 | 2,668 |
| Age 40 | 1,625 | 1,862 | 2,099 | 2,336 | 2,573 |
| Age 50 | 1,565 | 1,793 | 2,021 | 2,249 | 2,478 |
| Age 60 | 1,505 | 1,724 | 1,944 | 2,163 | 2,383 |
| Age 70 | 1,445 | 1,655 | 1,866 | 2,077 | 2,288 |
TDEE by height
Same weight at age 40, different heights.
| Height | Sedentary | Light | Moderate |
|---|---|---|---|
| 5 ft 4 in | 1,530 | 1,753 | 1,976 |
| 5 ft 6 in | 1,568 | 1,796 | 2,025 |
| 5 ft 8 in | 1,606 | 1,840 | 2,074 |
| 5 ft 10 in | 1,644 | 1,884 | 2,123 |
| 6 ft 0 in | 1,682 | 1,927 | 2,172 |
| 6 ft 2 in | 1,720 | 1,971 | 2,222 |
| 6 ft 4 in | 1,758 | 2,015 | 2,271 |
Calories to lose weight
| Goal | Calories/day | Change |
|---|---|---|
| Maintain | 1,862 | 0 |
| Lose 0.5 lb/week | 1,612 | -250 |
| Lose 1 lb/week | 1,500 * | -500 |
| Lose 1.5 lb/week | 1,500 * | -750 |
| Lose 2 lb/week | 1,500 * | -1,000 |
Lightly active, age 40, 5 ft 9 in. * Raised to 1,500 kcal, a common minimum without medical supervision.
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.
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These are estimates, not a diagnosis. A clinician can account for your health history and medicines.
Nearby weights
Common questions
How many calories does a 100 lb man burn a day?
About 1,354 calories at rest (BMR) and about 1,862 on a lightly active day, at 5 ft 9 in and age 40. Height, age and activity change it.
How many calories should a 100 lb man eat to lose weight?
About 1,500 a day for roughly 1 lb a week, if lightly active (a 500-calorie deficit).
Is this exact?
No. Formulas estimate averages within roughly 10% for most people. Track your weight for 2 to 3 weeks and adjust.