Most adult men need between 2,200 and 3,000 calories per day to maintain their weight, depending on age, size, and how physically active they are. That’s a wide range, and where you fall within it depends on a few key factors worth understanding.
General Calorie Ranges by Age and Activity
The Dietary Guidelines for Americans break calorie needs into three activity levels: sedentary (mostly sitting throughout the day), moderately active (equivalent to walking 1.5 to 3 miles daily on top of normal activities), and active (equivalent to walking more than 3 miles daily on top of normal activities).
For men between 19 and 30, the typical range is roughly 2,400 to 3,000 calories per day. Men aged 31 to 50 generally need 2,200 to 2,800. And for men over 60, the National Institute on Aging recommends 2,000 to 2,200 for sedentary men, 2,200 to 2,400 for moderately active men, and 2,400 to 2,600 for those with an active lifestyle.
These are population-level estimates. A 6’3″ man who weighs 210 pounds will need significantly more calories than a 5’7″ man who weighs 150 pounds, even if they’re the same age and activity level. To get a more personalized number, you can calculate your own baseline.
How to Estimate Your Personal Number
Your body burns a baseline number of calories just to keep you alive: breathing, circulating blood, maintaining body temperature, repairing cells. This is called your basal metabolic rate, or BMR. You then multiply that number by an activity factor to estimate your total daily calorie needs.
The most widely used formula for men is the Harris-Benedict equation: 88.362 + (13.397 × your weight in kilograms) + (4.799 × your height in centimeters) − (5.677 × your age in years). A more recent option, the Mifflin-St Jeor equation, is considered slightly more accurate: (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) + 5. A comparative study of predictive equations found the Mifflin-St Jeor version was more likely to estimate metabolic rate within 10% of actual measured values.
Once you have your BMR, multiply it by an activity factor. A common scale runs from 1.2 for sedentary individuals up to about 1.9 for very physically demanding lifestyles. For most men with desk jobs who exercise a few times a week, a multiplier around 1.4 to 1.6 is reasonable. The result is your estimated total daily energy expenditure, the number of calories you’d need to eat to stay at your current weight.
As a quick example: a 35-year-old man who is 5’10” (178 cm), weighs 180 pounds (82 kg), and exercises moderately would have a Mifflin-St Jeor BMR of roughly 1,748 calories. Multiply that by 1.55, and his daily maintenance comes to about 2,710 calories.
How Age Actually Affects Your Metabolism
There’s a widespread belief that metabolism drops steadily starting in your 20s or 30s. The reality, based on a large-scale study published in Science and covered by Harvard Health, is more nuanced. Researchers found that both total energy expenditure and basal metabolic rate remain remarkably stable from age 20 to 60, regardless of sex. The common experience of gaining weight in your 30s and 40s is more likely driven by changes in activity, diet, and gradual loss of muscle mass than by a slowing metabolism.
The real metabolic decline begins around age 60. After that point, energy expenditure drops by about 0.7% per year, even after accounting for changes in body size. By age 90, adjusted total energy expenditure is roughly 26% lower than in middle-aged adults. This is why calorie recommendations for men over 60 are noticeably lower than for younger age groups.
Calories for Weight Loss
If your goal is to lose weight, the fundamental approach is eating fewer calories than you burn. The Mayo Clinic notes that cutting about 500 calories per day from your usual intake typically leads to a loss of about half a pound to one pound per week. That’s a moderate, sustainable pace.
For most men, this means a weight-loss target somewhere around 1,700 to 2,200 calories per day, depending on your starting maintenance level. Dropping below 1,500 calories daily is generally not advisable for men without medical supervision, because it becomes difficult to get adequate nutrition and your body may start breaking down muscle for energy.
Protein intake matters during a calorie deficit. When you eat fewer calories than you burn, your body can pull energy from muscle tissue as well as fat. Eating enough protein helps protect that lean mass. Most adults need 0.8 to 1.6 grams of protein per kilogram of body weight, but someone actively losing weight may benefit from going higher, up to about 2.3 grams per kilogram, to preserve muscle while the scale goes down.
Calories for Building Muscle
Gaining muscle requires the opposite strategy: a calorie surplus. But more isn’t necessarily better. The current consensus among sports nutrition researchers is that a surplus of roughly 300 to 500 calories per day is the sweet spot. This range provides enough extra energy to fuel muscle growth while minimizing the fat you’ll inevitably gain alongside it.
For a man whose maintenance is 2,700 calories, that means eating around 3,000 to 3,200 daily while following a structured resistance training program. Protein needs also increase with heavy exercise. Avid exercisers generally need 1.4 to 2 grams of protein per kilogram of body weight to support muscle repair and growth.
Why These Numbers Are Starting Points
Calorie calculators and formulas give you an educated estimate, not a precise measurement. Your actual needs are influenced by factors no equation captures perfectly: your genetics, your gut microbiome, how much muscle versus fat you carry, your stress levels, how well you sleep, and even the temperature of your environment. Two men with identical height, weight, age, and activity levels can have metabolic rates that differ by several hundred calories.
The most practical approach is to use a calculated number as your starting point, then track your weight over two to three weeks. If your weight stays stable, you’ve found your maintenance. If it’s creeping up, you’re eating above maintenance. If it’s dropping, you’re below it. From there, adjust by 200 to 300 calories in whichever direction matches your goal, and give it another two to three weeks before adjusting again. This self-monitoring loop is more reliable than any formula on its own.