How Many Calories to Lose Weight? Calculate Your Deficit
Weight loss comes down to calories in versus calories out. That part is simple. What is not simple is figuring out exactly how many calories you should cut to lose weight at a rate that is both effective and sustainable.
Cut too little and nothing happens. Cut too much and you lose muscle, feel terrible, and eventually quit. There is a sweet spot, and it depends on your body size, activity level, and how fast you want to lose.
Use our free calorie calculator for weight loss to find your target. It takes your stats and your preferred pace and gives you a number you can actually use.
How the math works
One pound of body fat contains roughly 3,500 calories. To lose one pound per week, you need a daily deficit of about 500 calories. This does not mean you starve yourself — it means you eat 500 calories less than your body burns.
The calculator starts with your BMR (the calories you burn at rest), multiplies by your activity level to get your maintenance calories, then subtracts a deficit based on the pace you choose.
For most people, a 500-calorie deficit (1 lb/week) hits the sweet spot. You lose weight at a visible rate without feeling like you are starving. Faster paces work better for people with more weight to lose. Slower paces are better if you only need to drop a few pounds and want to minimize hunger.
Why pace matters more than you think
Fast weight loss sounds good, but there is a trade-off. When you cut calories aggressively, your body does not just burn fat for fuel. It also breaks down muscle tissue. Losing muscle lowers your metabolism, which means you have to eat even less to keep losing weight. That is how people get stuck in a cycle of eating 1,200 calories and still not losing.
Slower weight loss preserves more muscle. More muscle means a higher metabolism, which makes maintenance easier once you hit your goal. Our calorie deficit guide explains this in more detail.
The calculator gives you four pace options, from 0.5 lb/week (conservative) to 2 lbs/week (aggressive). Pick the one that fits your situation and adjust as you go.
What happens when the scale stops moving
Weight loss is not linear. You will have weeks where nothing moves, then a week where you drop two pounds. This is normal.
If the scale has not budged for three weeks of honest tracking, your deficit has probably shrunk. As you lose weight, your BMR drops. The same calorie target that worked at 200 pounds might be maintenance at 180 pounds. Recalculate every 10 to 15 pounds.
Pairing your calorie tracking with enough protein intake helps preserve muscle during the process. And make sure your sleep is on point — poor sleep can stall weight loss even with a perfect diet.
Beyond the number
The calorie target is a starting point. It is based on formulas and averages, not your unique body. Track your weight for two to three weeks. If you are losing at the expected rate, your number is right. If not, adjust by 100 to 200 calories and check again.
Use the calorie calculator to get your starting number, then pay attention to what your body tells you.
FAQs
Is it safe to eat below 1,200 calories?
For most women, no. Below 1,200 calories it becomes very difficult to get enough nutrients. For men, the floor is around 1,500 calories. The calculator will not let you go below these numbers.
Do I need to count calories forever?
No. A few weeks of tracking gives you a good sense of portion sizes. Many people find they can maintain results with occasional check-ins after the initial period.
Can I exercise more instead of eating less?
You can, but exercise alone rarely produces big weight loss. The calories burned during a workout are smaller than most people think. Diet is the main lever for weight loss; exercise is for health and muscle preservation.
Should I eat back calories I burn exercising?
Not if you are trying to lose weight. The activity multiplier in the calculator already accounts for your exercise. Eating back exercise calories doubles your deficit in a way that usually stalls progress.
