Calorie Deficit Calculator for Men

How this calculator works

The calculator estimates three things:

1. Your basal metabolic rate (BMR): the energy your body uses at rest, using the Mifflin–St Jeor equation for men: (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5.
2. Your maintenance calories: your BMR multiplied by an activity factor, from 1.2 for sedentary to 1.725 for very active.
3. A starting target: your maintenance minus a gentle (about 300 kcal) or moderate (about 500 kcal) daily deficit.

It also suggests a protein target of about 1.6 g per kg of body weight per day, which research commonly supports for men doing resistance training, and shows the expected pace of roughly 0.5% to 1% of body weight per week. The full reasoning is in our guide to calculating your calorie deficit.

A worked example

Take a 35-year-old man who is 180 cm tall, weighs 90 kg and is lightly active:

• BMR: (10 × 90) + (6.25 × 180) − (5 × 35) + 5 = 900 + 1,125 − 175 + 5 = 1,855 kcal (the calculator rounds to the nearest 10)
• Maintenance: 1,855 × 1.375 ≈ 2,550 kcal
• Moderate target: 2,550 − 500 ≈ 2,050 kcal (or about 2,250 kcal with the gentle deficit)
• Protein: 90 × 1.6 ≈ 145 g a day
• Expected pace: roughly 0.45 to 0.9 kg per week on average, after the first week or two

If, after three weeks, his weekly average has barely moved and his waist hasn't changed, he might trim another 100 to 200 kcal or add 2,000 daily steps. If he's losing more than about 1 kg a week and his training is suffering, he'd add a little food back.

Why the result is only a starting point

Every calorie formula is an estimate. Real people differ in muscle mass, daily movement, genetics and how accurately they report their activity. It's normal for your true maintenance to be a few hundred calories higher or lower than any calculator says.

That's why the most important step comes after you use this calculator:

1. Eat roughly your target consistently for two to three weeks.
2. Weigh yourself several mornings a week and track your weekly average with our weekly weight average calculator.
3. Measure your waist every one to two weeks.
4. Adjust by 100 to 200 kcal if your trend is faster or slower than you want.

Your own results are far more accurate than any formula.

Choosing your activity level

Most people overestimate how active they are. As a rough guide:

• Sedentary: you sit for most of the day and don't exercise regularly.
• Lightly active: you walk a fair amount or train one to three times a week.
• Moderately active: you walk a lot and train three to five times a week.
• Very active: you have a physical job or train hard most days.

If you're between two levels, choose the lower one and let your results guide any change.

Gentle or moderate deficit?

• Gentle (about 300 kcal/day) suits men who are already fairly lean, want to build chest muscle while losing fat, or have found bigger deficits hard to sustain.
• Moderate (about 500 kcal/day) is a common starting point for men with more body fat to lose.

Bigger isn't better. Aggressive deficits tend to cost muscle, sleep and training quality, and they're harder to sustain for months.

About the 1,500-calorie floor

If a deficit would take you below about 1,500 kcal a day, the calculator doesn't show a target and explains why. It also won't suggest a deficit if your BMI is in the underweight range. Very low intakes make it hard to meet your nutritional needs, increase muscle loss and are difficult to sustain. They should only be followed with medical supervision. If you're in that situation, choose the gentle deficit, add daily walking, or speak with a doctor or registered dietitian.

What the numbers can't tell you

• They can't target chest fat. A calorie deficit reduces overall body fat, and your body decides where it comes from. See why you can't spot-reduce chest fat.
• They can't tell you what's causing chest fullness. If some of it is glandular tissue (gynecomastia), fat loss won't remove it. See chest fat vs gynecomastia.
• They don't account for medical conditions or medications that affect weight, appetite or metabolism.

Turning your target into meals

A number on its own doesn't create a deficit. These habits make your target much easier to hit:

• Protein at every meal. See how much protein do you need?
• Vegetables and fibre for volume and fullness
• Fewer liquid calories, especially sugary drinks and alcohol
• Planned meals for busy days, such as simple meal prep

If you'd rather not count calories long term, use the calculator to learn roughly what your target looks like for a couple of weeks, then switch to portion habits. The beginner fat-loss guide explains both approaches.

When progress stalls

As you lose weight, your maintenance calories fall. Eventually your deficit shrinks and progress slows. That's normal. Re-run the calculator with your new weight, compare it with your real trend, and make one small adjustment. Fat-loss plateaus walks through what to check first.

Your privacy

This calculator runs entirely in your browser. Your age, height and weight are never sent to our servers or stored anywhere, and our analytics only record that the calculator was used, never what you entered. See our privacy policy.