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The calorie deficit to lose 15 pounds

15 lb is 6.8 kg, and it takes about 52,500 calories of accumulated deficit to shed. How long that takes is entirely a question of how fast you're willing to go.

How long it takes, by pace

PaceDaily deficitWeeksMonths
0.5 lb/weekSlow and steady250306.9
1 lb/weekStandard500153.5
1.5 lb/weekAggressive750102.3
2 lb/weekVery aggressive1,00081.8
  • 0.5 lb/week — Easiest to stick to and the least disruptive to training or social life.
  • 1 lb/week — The pace most guidance points at. Noticeable progress without white-knuckling it.
  • 1.5 lb/week — Workable if you have a lot to lose. Harder to hold past a couple of months.
  • 2 lb/week — Only appropriate at higher starting weights, and more of what you lose will be muscle.

A caveat every other calculator skips

15 weeks is long enough that this arithmetic will drift. As you get lighter you burn less, so the back half will be slower than the front half. Recalculate every 4 weeks.

Why your starting weight changes the answer

The safe pace scales with your bodyweight, not with your goal. Losing 15 lb is a much bigger proportional change for a lighter person, and the sustainable ceiling of about 1% of bodyweight per week moves with them.

Starting weight15 lb isSafe max paceFastest sensibly
140 lb10.7%1.4 lb/wk11 weeks
160 lb9.4%1.6 lb/wk10 weeks
180 lb8.3%1.8 lb/wk9 weeks
200 lb7.5%2 lb/wk8 weeks
220 lb6.8%2.2 lb/wk7 weeks
250 lb6%2.5 lb/wk6 weeks
280 lb5.4%2.8 lb/wk6 weeks
320 lb4.7%3.2 lb/wk5 weeks

Get your actual number

The tables above are the arithmetic of 15 lb in general. Your maintenance depends on your age, height, weight, and how much you move — and that's what sets the target you actually eat to.

Calculate my deficit — free

Common questions

How long does it take to lose 15 pounds?

At a standard pace of 1 lb per week it takes about 15 weeks — roughly 3.5 months — and needs a daily deficit of about 500 calories. Going faster is possible but the sustainable ceiling is about 1% of your bodyweight per week, so a heavier person can safely lose 15 lb sooner than a lighter person can.

What daily calorie deficit do I need to lose 15 pounds?

It depends entirely on the pace you pick, not on the 15 lb target itself. A pound of fat is about 3,500 calories, so 1 lb per week needs roughly 500 calories a day below your maintenance. The target only changes how long you hold that deficit.

Is losing 15 pounds fast safe?

The limiting factor is your bodyweight, not the goal. Most guidance caps sustainable loss at about 1% of bodyweight per week, and going beyond that means a larger share of what you lose is muscle rather than fat. There is also a floor: never eat below your resting metabolic rate, and generally not below 1,200 calories for women or 1,500 for men.

cutcalc gives general information, not medical advice. Talk to a doctor or registered dietitian before making significant changes to how you eat.