Calorie Calculator for Men — Daily Needs

A man’s daily calorie requirement is not a fixed number by sex — it is his body and his week, with a sex term applied. The calculator opens on the male setting. Inputs are metric: 180 lb is 81.6 kg and 5 ft 10 in is 178 cm.

The male equations, spelled out

The resting-rate step uses Mifflin-St Jeor in its male form:

Resting rate = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5

The female version ends in −161 instead of +5. That 166-calorie spread is the whole of the “sex difference” in the formula, and it is a stand-in for the fat-free mass the equation cannot see.

Worked out for a man of 35, 180 lb (81.6 kg) and 5 ft 10 in (178 cm): 816 + 1,112.5 − 175 + 5 = about 1,759 kcal at rest. On a moderate activity factor, 1,759 × 1.55 = about 2,726 kcal/day.

The 2023 Dietary Reference Intakes take a different route to the same question, skipping the resting-rate step entirely:

Activity band	Same man, 2023 DRI equation
Inactive	2,682 kcal/day
Low active	2,899 kcal/day
Active	3,085 kcal/day
Very active	3,441 kcal/day

The age term is steeper for men

Here is a detail the general-audience version of this topic usually skips. In the 2023 equations, the age coefficient is −10.83 kcal per year for men and −7.01 for women. Over 35 years that is 379 calories against 245 — men’s requirements fall away from their peak faster, in absolute terms, than women’s do.

That is not the same as metabolism collapsing at 30. Measurement of expenditure adjusted for fat-free mass shows a flat plateau from age 20 to about 60, with the decline arriving in the sixth decade. What generally happens to a man in his thirties is that he keeps eating like his twenty-five-year-old self while carrying less muscle and moving less. Both of those are inputs, not fates — the calorie needs for older adults page follows the curve past 60.

Targets, from the same baseline

Once the maintenance figure is settled, everything else is arithmetic on top of it:

• Losing: 15 to 25% under it. On 2,900 kcal that is 2,175 to 2,465. The calorie calculator for weight loss explains why a percentage travels better than a flat 500.
• Gaining: 10 to 15% over, with training to spend it on — see the calorie calculator to gain muscle.

Men often start from a higher absolute expenditure, which makes early weight loss look faster. That is a bigger denominator, not a better metabolism; the same 500-calorie cut is a milder deficit for someone burning 3,000 than for someone burning 1,900.

Which band you are really in

The activity setting will change your result more than anything else on the form. If you sit for work and train four times a week, you are probably moderate rather than intense — the sedentary calorie needs page shows what the bottom of the scale looks like, and the calorie calculator for women covers the same ground with the other sex term for comparison.

This content is informational and does not replace advice from a physician or registered dietitian.