You’ve probably heard the standard advice: eat less, move more. Technically true. Practically useless. Because “eat less” could mean 2,500 calories or 1,200, and the difference between those two numbers is the difference between steady fat loss and feeling miserable for three weeks before quitting.
So let’s actually answer the question: how many calories should you eat to lose weight?
Start with maintenance, not a random number
Your maintenance calories are roughly what you’d eat to stay exactly the same weight. Everything starts here, because your fat-loss target is just maintenance minus a deficit.
The quick way to estimate it: take your bodyweight in pounds and multiply by 14 to 16. If you’re moderately active, 15 is a solid middle ground.
So a 180-pound person lands around 2,700 calories for maintenance. That’s a starting line, not a prescription. Your real number depends on your activity, your muscle mass, your job, your training. But you need somewhere to start, and this is a good somewhere.
The deficit: smaller than you think
Here’s where most people go wrong. They pick a huge deficit because they want fast results, then wonder why they’re exhausted, hungry, and thinking about food all day by week two.
A moderate deficit of 300 to 500 calories below maintenance is the sweet spot for most people. That’s roughly a pound of fat loss per week. Not dramatic. Sustainable, which is the whole game.
At 2,700 maintenance, that puts our 180-pound person at 2,200 to 2,400 calories a day. Still plenty of food. That’s the point.
Why aggressive deficits backfire
Cut too hard and a few things happen, all of them bad.
Your energy tanks. Training quality drops. You lose muscle along with fat, which is the opposite of the goal. Hunger becomes constant instead of manageable. And eventually you rebound, because nobody sustains 1,200 calories while living a normal life.
Slow fat loss you can actually maintain beats fast fat loss that ends in a binge weekend. Every time.
Protein is non-negotiable
When you’re in a deficit, protein does two jobs: it keeps you full, and it protects your muscle while you lose fat.
Aim for 0.7 to 1 gram per pound of bodyweight per day. For our 180-pound person, that’s 125 to 180 grams. Yes, that’s a lot of chicken. Spread it across three to four meals and it becomes manageable.
This is the one macro worth tracking even if you track nothing else.
A quick note on tracking
You don’t need to weigh every gram of rice forever. But tracking for two to four weeks at the start is the fastest way to calibrate your eye. Most people are shocked at what a tablespoon of peanut butter actually looks like versus what they’ve been scooping. After a few weeks of honest tracking, you can ease off and eat mostly by feel. The education sticks.
How to know your number is right
You picked a starting target. Now watch what happens for two to three weeks.
Losing about half a pound to a pound per week? Your number is right. Stay the course.
Weight hasn’t moved in three weeks? Drop another 200 calories, or add some daily activity. Small adjustment, then wait again.
Losing faster than a pound and a half per week, or feeling wrecked? You’re cutting too hard. Eat a little more. This isn’t a race.
The scale will bounce around day to day. Water, food, stress, sleep all move it. Compare weekly averages, not daily weigh-ins.
What about exercise?
Training helps, but be honest about what it actually burns. An hour of lifting might burn 200 to 300 calories. That’s one muffin. Exercise is for building the body. The deficit is mostly built in the kitchen.
That said, daily movement matters more than people think. Walking is underrated for fat loss. Eight to ten thousand steps a day adds up to a meaningful chunk of your deficit without making you hungry the way intense cardio does.
The bottom line
Find your maintenance. Subtract 300 to 500. Eat enough protein. Adjust based on what the scale does over two to three weeks, not two to three days.
Fat loss is simple. It’s just not easy, which is why having someone in your corner helps. If you want a nutrition target built around your body and your life instead of a calculator’s guess, book a free consultation and we’ll figure out your numbers together.