How to Calculate Your Daily Calories for Weight Loss

To find your daily calorie target for weight loss, estimate how many calories your body burns in a day and subtract 500 to 750 from that number. Run it once, then adjust from what the scale does. The rest of this is about getting the first number close and knowing what to do when the scale stops cooperating.

Most people skip the estimate entirely and just eat less than they feel like eating. That works for about two weeks. Then hunger wins, because there was never a target to hit or miss.

First, estimate what you burn

Start with your basal metabolic rate, which is what your body would burn lying in bed all day keeping your heart beating and your brain running. The Mifflin-St Jeor equation is the one most coaches and dietitians reach for. You need your weight in kilograms (pounds divided by 2.2) and your height in centimeters (inches times 2.54).

Men: BMR = (10 x weight in kg) + (6.25 x height in cm) minus (5 x age) plus 5

Women: BMR = (10 x weight in kg) + (6.25 x height in cm) minus (5 x age) minus 161

Then multiply that BMR by an activity factor to get your total daily energy expenditure, the number that actually matters:

• Desk job, little exercise: 1.2
• Light activity, one to three workouts a week: 1.375
• Moderate, three to five workouts a week: 1.55
• Hard training five or six days a week: 1.725
• Physical job plus daily training: 1.9

Here is how that plays out for a 45 year old man, 5 feet 10 inches, 230 pounds, who lifts twice a week. His weight is 104.3 kg and his height is 177.8 cm, so his BMR lands near 1,934 calories. Multiply by 1.375 and he burns roughly 2,660 calories a day.

Now subtract, but not as much as you want to

From 2,660, a 500 calorie deficit puts him at about 2,160 a day. That is the range we would start someone at: enough of a gap to move the scale, small enough that he can still train hard and sleep through the night.

The old rule says a pound of fat is about 3,500 calories, so 500 a day should give you a pound a week. Treat that as arithmetic, not a promise. It holds up reasonably well early and then drifts, because a smaller body burns fewer calories and because most people quietly move less when they are eating less. Individual results vary.

Going bigger than a 750 to 1,000 calorie deficit is where things usually fall apart. Appetite climbs, strength drops, and the plan gets abandoned by week three. A slower deficit you can hold for four months beats an aggressive one you hold for nine days.

Put protein first, then divide the rest

Calories decide whether you lose weight. Protein has a lot to say about whether what you lose is fat or muscle. Somewhere between 0.7 and 1 gram per pound of your goal body weight is a sensible working range for most people who are lifting. Protein also keeps you full, which is worth more than any macro chart when you are three weeks into eating less.

After protein, set fat somewhere around a quarter to a third of your calories and let carbohydrates take what is left. Carbs are what make your training sessions feel decent, so cutting them to almost nothing while trying to get stronger is a fight you do not need. If you want the protein piece in more detail, we wrote about how much protein to eat while losing weight separately.

The part the calculators leave out

Every equation here is an estimate built from population averages, and your actual burn could sit a couple hundred calories above or below what the math says. Two people of the same height, weight and age still differ in how much they fidget, how well they sleep, and how accurately they log a tablespoon of olive oil.

So use the number as a starting hypothesis, not a verdict. Eat at that target for two to three weeks, weigh yourself a few mornings a week under the same conditions, and look at the average rather than any single day. If the average has not moved at all in three weeks and your logging has been honest, cut about 150 to 200 calories and repeat. If you are dropping faster than about one percent of your body weight a week and feel wrecked, add some back.

One more thing worth saying plainly: if you are on medication that affects appetite or metabolism, if you have a thyroid condition, or if you have a history of disordered eating, calorie math is not the right first step and a calculator is not the right advisor. Talk to your physician or a registered dietitian first.

What to do tonight

Run the math tonight, write your number down, and eat within about 100 calories of it for the next fourteen days before you change anything. If you want a training program built around that number instead of guessing, that is what our online coaching does, and you can also grab a free custom weekly workout plan to start with.

Common questions

How many calories should I eat to lose weight?

Estimate your daily burn with the Mifflin-St Jeor equation and an activity multiplier, then subtract 500 to 750. For most adults that produces a target somewhere between 1,400 and 2,400 calories, but the honest answer depends on your size, age and activity, which is exactly why the equation exists.

Is eating 1,200 calories a day a good idea?

For most adults it is unnecessarily low and hard to sustain, and it makes hitting your protein and fiber needs difficult. If your calculated target comes out near 1,200, that is usually a sign to add activity rather than cut food further.

What if my weight has not moved in three weeks?

Check your logging first, including cooking oils, drinks and weekend meals, since that is where most estimates go wrong. If the log is accurate, trim 150 to 200 calories or add daily walking, then give it another two weeks before changing anything else.