Calorie needs at age 40, male
This page estimates total daily energy use. The sample is a man aged 40 at 5 ft 10 in and 178 lb, and the table shows every activity level.
How it works
Start with resting calories from Mifflin-St Jeor. Take 10 times weight in kilograms and add 6.25 times height in centimeters. Subtract 5 times age. Then add 5 for males or subtract 161 for females. Multiply by an activity factor to get daily calories. For a man aged 40 at the lightly active level the fixed adjustment is plus 5.
Worked example
For a man aged 40, weight is 80.74 kg and height is 177.8 cm. Weight gives 10 × 80.74 = 807.4. Height gives 6.25 × 177.8 = 1111.25. Age takes off 5 × 40 = 200. Add 5. Resting calories are 1723.65, or 1724 when rounded. Multiply by 1.375 for the lightly active level to get 2370. That rounds to 2370 calories a day.
Maintenance calories at every activity level for the same man aged 40 at 5 ft 10 in and 178 lb, with the lightly active level set in the form above.
- Sedentary (little or no exercise)
- 2068 calories a day
- Lightly active (light exercise 1 to 3 days a week)
- 2370 calories a day
- Moderately active (moderate exercise 3 to 5 days a week)
- 2672 calories a day
- Very active (hard exercise 6 to 7 days a week)
- 2973 calories a day
- Extra active (very hard exercise and a physical job)
- 3275 calories a day
Common questions
How big a calorie deficit is reasonable for weight loss?
A deficit of 500 calories a day is a common starting point and works out to roughly half a kilogram a week. Smaller deficits are slower and easier to keep up. A 500 calorie deficit here means 1870 calories a day for this 40-year-old man at the lightly active level.
How big a surplus helps build muscle?
A modest surplus of about 250 calories a day is a common starting point. Larger surpluses tend to add more fat without adding muscle faster. A 250 calorie surplus here means 2620 calories a day for this 40-year-old man at the lightly active level.
Why does age 40 change the result?
The formula takes 5 calories off for every year of age, which reflects that resting burn tends to fall over time. At 40 that is 200 calories. Without the age term this 40-year-old man would burn 1924 calories at rest, or 2645 a day at the lightly active level.
How accurate is a calorie estimate?
It is a starting estimate. Track your weight over two or three weeks and adjust the target up or down based on what actually happens. For this 40-year-old man, a 5 percent error on 2370 calories is 119 calories a day.
What is the difference between BMR and TDEE?
BMR is what your body burns at rest. TDEE adds the calories you use moving and exercising. It is always higher. For this man aged 40 at 178 lb, BMR is 1724 calories and TDEE at the lightly active level is 2370.