How Many Calories Are in a Pound of Fat?

Where 3,500 comes from

Pure fat holds about 9 calories per gram. A pound is roughly 454 grams, but body fat tissue is not pure fat — some is water and connective tissue — so the usable figure works out near 3,500 calories per pound, or about 7,700 per kilogram. It is an estimate, not a precise constant.

Using it to plan fat loss

A daily deficit of 500 calories adds up to about 3,500 a week, the classic "lose about a pound a week" target. A safe pace is roughly 0.5 to 1 pound (0.25 to 0.5 kg) per week. Bigger deficits are harder to sustain and cost more muscle.

Why the scale won't obey exactly

As you lose weight your body burns fewer calories, so a fixed deficit slowly shrinks. Day-to-day the scale swings with water, salt, carbs and hormones. Judge progress over weeks, not days, and adjust when the trend stalls.

Frequently asked questions

Is 3,500 calories per pound exact?

No — it's a well-known approximation. The real energy value varies between people and diets, so treat it as a planning rule of thumb, not a precise law.

Can I lose fat faster with a huge deficit?

You may lose weight faster short-term, but very large deficits burn more muscle, worsen hunger and are hard to keep up. A moderate deficit protects muscle and lasts.

Does exercise burn a pound of fat quickly?

Not quickly — burning 3,500 calories through exercise alone takes hours of effort. Fat loss comes mostly from the overall daily balance of food and activity, sustained over time.

What if my weight loss stalls?

A stall usually means your intake now matches your lower calorie needs. Recheck your maintenance calories, tighten portions or add activity, and give it a couple of weeks.