Your basal metabolic rate (BMR) is the number of calories your body burns at complete rest just to stay alive — breathing, circulating blood, maintaining your organs and body temperature. For men, BMR is usually higher than for women of the same height and weight because men tend to carry more muscle and less body fat. This BMR for Men Calculator estimates your resting calorie burn using three proven formulas and shows what that number means for daily maintenance calories.
Choose metric or imperial units, enter your age, height, weight, and optional body fat percentage, then pick an activity level. The tool returns your BMR and estimated total daily energy expenditure (TDEE) in seconds. Whether you are tracking macros, planning a calorie deficit, or simply curious about your metabolism, this free BMR calculator gives you a practical, science-based starting point for your goals.
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How This BMR Calculation Works
The basal metabolic rate (BMR) is the energy your body uses at complete rest to keep your heart beating, lungs breathing, brain functioning, and body temperature stable. For adult men, BMR typically runs higher than for women of the same height and weight because men usually have a greater proportion of muscle mass and a lower proportion of body fat. This calculator uses three respected prediction equations, so you can see how the estimate changes depending on the method.
The default is the Mifflin-St Jeor equation, introduced in 1990 and often considered the most accurate clinical formula for normal-weight and overweight adults:
The sex term in the men's version is +5; for women it is −161. The revised Harris-Benedict equation, published in 1984, uses a similar structure with different coefficients: BMR = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) − (5.677 × age). The Katch-McArdle formula is different because it starts from lean body mass: BMR = 370 + (21.6 × lean mass in kg). This makes it a sensible option for athletic men who know their body fat percentage.
For a fuller explanation of metabolic measurements, the Wikipedia article on basal metabolic rate is a useful starting point, and the NIH Body Weight Planner can turn your numbers into a practical eating plan.
Worked Examples
Example 1 — Mifflin-St Jeor. A 30-year-old man weighs 80 kg and is 180 cm tall.
BMR = (10 × 80) + (6.25 × 180) − (5 × 30) + 5 = 800 + 1125 − 150 + 5 = 1,780 kcal/day.
At a moderately active multiplier of 1.55, his maintenance calories are 1,780 × 1.55 ≈ 2,759 kcal/day.
Example 2 — Revised Harris-Benedict. A 45-year-old man weighs 95 kg and is 183 cm tall.
BMR = 88.362 + (13.397 × 95) + (4.799 × 183) − (5.677 × 45) = 88.362 + 1,272.72 + 878.22 − 255.47 ≈ 1,984 kcal/day.
Example 3 — Katch-McArdle. A 25-year-old man weighs 75 kg with 15% body fat.
Lean mass = 75 × (1 − 0.15) = 63.75 kg.
BMR = 370 + (21.6 × 63.75) ≈ 1,747 kcal/day.
Activity Multiplier Reference
Your total daily energy expenditure (TDEE) is roughly BMR × activity factor. The factors below follow the standard categories used in many nutrition textbooks. Choose the one that best matches your typical weekly schedule.
| Activity Level | Daily Pattern | Multiplier |
|---|---|---|
| Sedentary | Desk job, little or no exercise | 1.20 |
| Lightly active | Light exercise 1–3 days/week | 1.375 |
| Moderately active | Moderate exercise 3–5 days/week | 1.55 |
| Very active | Hard exercise 6–7 days/week | 1.725 |
| Extra active | Physical job plus hard training | 1.90 |
Pro Tips for Accurate Results
Measure under consistent conditions. Weigh yourself in the morning after using the bathroom and before eating or drinking. Stand barefoot and use a wall-mounted stadiometer if possible. Even small errors in weight or height can shift the result by 50–100 kcal/day.
- Use the Mifflin-St Jeor equation for most adult men; it has the strongest validation in contemporary research.
- Use Katch-McArdle only when body fat has been measured with calipers, bioelectrical impedance, or DEXA — not just guessed.
- Recheck your numbers every 4–6 weeks, especially if you are gaining or losing weight, because BMR changes as lean mass and body weight change.
- Remember that the final TDEE line is an estimate. Real-world appetite, non-exercise activity, and genetics all affect your actual energy needs.
If you want to convert a calorie goal into concrete movement, the active minutes calculator can show how many minutes of common activities equal your target burn.
Frequently Asked Questions
Why is men's BMR higher than women's?
Men typically have more skeletal muscle and larger organs relative to body size, and muscle burns more calories at rest than fat. The sex adjustment in the formulas accounts for this population-level difference, though individual variations can be large.
Does my BMR drop as I get older?
Yes. Both the Mifflin-St Jeor and Harris-Benedict equations subtract a term based on age because metabolically active tissue tends to decline with age if muscle mass is not preserved. Strength training and adequate protein intake can slow this decline considerably.
Can I increase my BMR?
To a degree. Resistance training increases lean body mass, and a higher lean mass raises resting energy expenditure. Some studies also show that higher protein diets increase the thermic effect of food. However, your BMR is largely constrained by your age, genetics, and body size.
Which formula should I choose?
Most health professionals default to Mifflin-St Jeor. If you are very lean and know your body fat percentage, try Katch-McArdle for a more individualized estimate. Revised Harris-Benedict is a fine alternative when you want a comparison, but it tends to overestimate in modern populations.
These results are estimates for healthy adults and are not a medical diagnosis. If you are managing diabetes, thyroid disease, or another condition that affects metabolism, consult a registered dietitian or physician before changing your calorie intake.