How Many Calories Should I Eat to Lose Fat?

It's one of the most common questions I get asked. “How many calories should I eat to lose fat?”. And it's a good question, because getting this number right is the foundation of every successful fat loss journey.

Eat too many calories and you won't lose fat no matter how hard you train. Eat too few and you'll lose muscle, feel terrible and end up burning out.

In this post I'm going to show you exactly how to work out the right number of calories for fat loss, the same approach I use with men across the UK, USA and Europe to build elite physiques.

Why Calories Are the Foundation of Fat Loss

Fat loss comes down to one fundamental principle. Energy balance. To lose fat you need to be in a calorie deficit, which means eating fewer calories than your body burns.

When you're in a deficit, your body makes up the energy shortfall by using stored body fat as fuel. Do this consistently over time and you lose fat.

No diet, supplement or training programme overrides this. Carb cycling, intermittent fasting, keto, they all work only if they put you in a calorie deficit. The deficit is the thing that actually drives fat loss. Everything else is just a method of getting there.

Step 1- Work Out Your Maintenance Calories

Before you can set a deficit, you need to know your maintenance calories, the amount that keeps your weight stable.

A simple starting estimate is to multiply your bodyweight in kg by 30-33. For an 80kg man that's roughly 2,400-2,640 calories per day to maintain weight.

This is just a starting point. Your real maintenance depends on your activity levels, muscle mass and metabolism. The most accurate way to find your true maintenance is to track your calories and weight for two weeks and see what keeps you stable, but the estimate above is a solid place to begin.

Step 2- Set Your Deficit

Once you have your maintenance number, you create your deficit by eating below it.

For most men I recommend a deficit of 300-500 calories per day. Using our 80kg example with a maintenance of around 2,500 calories, that means eating around 2,000-2,200 calories per day for fat loss.

This size of deficit produces steady fat loss of roughly 0.5-1% of bodyweight per week fast enough to see real progress, slow enough to protect your muscle and stay sustainable.

Why Not Just Eat as Little as Possible?

It's tempting to slash your calories dramatically to lose fat faster. Don't. An aggressive deficit causes real problems.

You lose muscle alongside fat leaving you smaller but still soft rather than lean and defined. Your energy crashes, making training and daily life harder. Your hunger becomes unmanageable, making the diet impossible to stick to. And your progress stalls faster as your body adapts.

A moderate deficit you can sustain for months will always beat an extreme deficit you abandon in two weeks.

Step 3- Prioritise Protein

Once your calories are set, protein is your next priority. High protein is what protects your muscle in a deficit and keeps you full.

Aim for 2g of protein per kg of bodyweight every day. For an 80kg man that's 160g of protein. Build your meals around a protein source first, then fill the rest of your calories with carbs and fats.

Step 4- Track and Adjust

Your starting calorie number is an educated estimate, not a perfect prescription. The key to success is tracking your progress and adjusting based on real data.

Track your calories consistently and weigh yourself several times a week, taking a weekly average to smooth out daily fluctuations.

If you're losing weight at a steady rate keep going. If your weight hasn't moved after 2-3 weeks reduce your calories by around 150-200 per day. If you're losing too fast and feeling awful add some calories back.

This process of tracking and adjusting based on your actual results is what separates men who get lean from men who guess and stall.

A Simple Example

Let's put it all together for an 80kg man who wants to lose fat:

Maintenance calories: ~2,500 (80kg x 31)
Fat loss calories: ~2,100 (400 calorie deficit)
Protein target: 160g per day
Remaining calories: filled with a balance of carbs and fats

He tracks consistently, weighs himself regularly and adjusts every 2-3 weeks based on his average weekly weight change.

That's the entire framework. Simple, effective and built on the fundamentals rather than gimmicks.

Common Mistakes When Setting Calories for Fat Loss

Underestimating what you eat. Most men significantly underestimate their calorie intake. Track everything accurately the oils you cook with, the drinks, the "little bits", it all counts.

Setting the deficit too aggressively. Slow and sustainable beats fast and unsustainable every time.

Not adjusting over time. As you lose weight your maintenance calories drop, so your deficit needs adjusting periodically to keep progress moving.

Ignoring protein. Calories drive fat loss but protein determines whether you lose fat or muscle. Keep it high.

The Bottom Line

Working out how many calories to eat for fat loss isn't complicated. Estimate your maintenance, subtract 300-500 calories, prioritise protein and adjust based on your real results.

The men who struggle aren't the ones who get the maths slightly wrong they're the ones who don't track at all and rely on guesswork. Get the number right, stay consistent and adjust as you go, and fat loss becomes predictable.

If you want your calories, protein and full nutrition plan built specifically for your physique goal with weekly adjustments based on your real data, that's exactly what I do for every man I coach.

[Find out more about 1-1 coaching] or [claim your free Shred Starter] to get started.