How Many Calories Should You Eat to Lose Fat?

Search this question and you'll find a hundred different numbers, most of them guesses. The real answer starts with two numbers you can actually calculate: your maintenance calories, and how far below that you should eat.

Start with maintenance, not the diet

Before you can lose fat on purpose, you need to know how many calories your body burns in a day at its current size and activity level. This is your maintenance number, sometimes called TDEE (Total Daily Energy Expenditure). It's built from two pieces: your BMR (the calories you'd burn lying in bed all day, just keeping your organs running) and an activity multiplier on top of that for how much you move.

Guessing this number is where most diets go wrong before they even start. Someone who estimates their maintenance at 2,000 calories when it's actually 2,500 will end up in a much bigger deficit than they think, and wonder why they're constantly hungry and exhausted two weeks in.

Why a smaller deficit usually wins

The instinct is to cut hard and lose fat fast. In practice, a 15-20% deficit below maintenance tends to outperform a 40-50% deficit over any real timeframe, for a simple reason: adherence. An aggressive cut is miserable enough that most people abandon it within a few weeks, at which point the deficit size stops mattering because it's not happening anymore.

A moderate deficit is slower on paper but faster in practice, because it's the one you'll actually still be following a month from now. It also does a better job protecting muscle mass and keeping your energy levels normal enough to still train hard.

Protein is the piece people skip

Calories decide whether you lose weight. Protein decides whether what you lose is mostly fat or partly muscle. A useful target is roughly 2-2.2g of protein per kilogram of bodyweight while cutting, higher than what most general nutrition guidelines suggest, because a calorie deficit already puts muscle at risk and protein is what defends it.

The number nobody wants to hear

There's no universal "eat this many calories" answer, because it depends on your current weight, height, age, sex, and activity level. What's consistent is the method: find your maintenance, subtract a moderate percentage, hit your protein target, and reassess every couple of weeks against your actual weight trend rather than the scale on any single day.