How Much Weight Will I Lose on 1,500 Calories a Day?

Eating 1,500 calories a day tells you only half the story — the half you control. What actually decides your loss is the gap between 1,500 and your maintenance, the calories your body burns on a typical day. A pound of fat is about 3,500 calories, so weekly loss is simply that daily gap multiplied by seven and divided by 3,500. If you maintain at 2,000, the gap is 500 a day, which works out to a pound a week and roughly four pounds in a month. If you maintain at 2,500, the gap is 1,000 a day — about two pounds a week and close to eight in a month. Someone maintaining at just 1,700 has only a 200-calorie gap, so they would lose nearer 0.4 lb a week on the same 1,500. Same plate, very different results, because maintenance is the variable that moves.

To turn 1,500 calories into a real number for you, start by estimating your maintenance. The Mifflin-St Jeor equation does this from your weight, height, age, sex and activity, and it is the method the TDEE Calculator uses. A 90 kg man who is moderately active might maintain around 2,700 calories, giving a 1,200-calorie deficit at 1,500 — a fast pace that the safe-intake floor would flag. A 60 kg woman who is lightly active might maintain closer to 1,800, leaving a gentle 300-calorie gap and slow, steady loss on the very same 1,500. Once you know your maintenance, subtract 1,500 and divide by 3,500 for your weekly pounds. To split that 1,500 into protein, carbs and fat so the deficit is liveable, hand it to the Macro Calculator.

If your first week or two on 1,500 calories drops more than the (maintenance − 1,500) ÷ 3,500 sum predicts, that is normal. The early loss is mostly water and glycogen rather than fat: as your body draws down its glycogen stores it lets go of the water held with them, and each gram of glycogen carries about three grams of water. That front-loads the scale, then loss settles back toward the steady pace your calorie gap sets. The practical takeaway is to judge 1,500 calories over three to four weeks, not the first few days, so an early plunge does not set an expectation the arithmetic cannot keep meeting.

The ranges above are the general shape; your own figure depends on your body. The Weight Loss Calculator below is set to 1,500 calories a day — enter your weight, height, age, gender and activity and it estimates your maintenance, then shows exactly how fast you’d lose eating 1,500: your weekly and monthly loss and the deficit behind it. Change the intake to try other numbers, and if 1,500 sits below the safe floor for you it says so. These figures are general estimates for healthy adults, not medical advice.