How Many Calories to Lose 1 Pound a Week

How many calories is one pound a week?

The short answer is about 500 calories a day. That number comes from a single, widely-used rule of thumb: a pound of body fat stores roughly 3,500 calories of energy. If you want to shed one pound in a week, you need your body to burn through about 3,500 calories more than you eat over those seven days. Spread evenly, that is 3,500 divided by 7, which is 500 calories a day.

So the headline equation is simple: a 500-calorie daily deficit gives you roughly one pound of fat loss per week. Halve the deficit to 250 a day and you lose around half a pound a week. Double it to 1,000 a day and you are aiming for about two pounds, though as we will see, bigger is not automatically better and is not always realistic.

It is worth being clear that this is a planning tool, not a guarantee. The 3,500-calorie figure is an approximation that has been useful for decades, but bodies are not spreadsheets. Treat it the way you would treat a budget: a sensible target to aim at, knowing the real numbers will wobble week to week.

Where does the 3,500-calorie number come from?

The 3,500-calorie-per-pound figure is an estimate of how much energy is stored in a pound of body fat. Fat is the body's energy reserve, and gram for gram it is calorie-dense: fat carries about 9 calories per gram, compared with about 4 for carbohydrate and 4 for protein. A pound of pure fat would hold more than 4,000 calories, but body fat tissue is not pure fat (it includes some water and other material), so the working estimate landed around 3,500.

That history matters because it explains why the rule is a starting point rather than a precise law. Researchers have pointed out for years that strictly applying 3,500 calories per pound overpredicts long-term loss, because your body adjusts as you get smaller. Still, over a single week, for someone of average size, it is close enough to be genuinely useful for setting a daily target. That is exactly what we are using it for here.

To create the deficit, you first need a rough idea of what you burn in a day, your total daily energy expenditure, or TDEE. A common way to estimate it is to take your resting burn and multiply by an activity factor. The multipliers below are illustrative, not exact, but they show the shape: the same person can have a very different daily burn depending on how active they are.

Once you have a TDEE estimate, the deficit is just subtraction: eat about 500 below it for a pound a week. Someone burning roughly 2,060 calories would aim to eat around 1,560; someone burning 2,590 would aim for about 2,090. Same deficit, different intake, because they burn different amounts.

What daily deficit gives what weekly loss?

Because the math scales cleanly, you can read off any pace you like. The table below maps a daily deficit to the weekly loss it targets, using the 3,500-calories-per-pound rule of thumb. Remember these are estimates of fat loss; the number on the scale can move faster or slower in any given week for reasons we will cover.

Most people are best served somewhere in the 250-to-750 range. A 250-calorie deficit is barely noticeable day to day and is easy to hold for a long time, which is its whole advantage. A 500-calorie deficit is the classic one-pound-a-week target and a reasonable default for many people. A 1,000-calorie deficit is aggressive and, for a lot of people, simply not sustainable, especially if their daily burn isn't high enough to leave them with enough food to feel good.

What do the numbers look like at different body sizes?

The right deficit depends heavily on how much you burn, which depends a lot on body size. Here are two worked examples at opposite ends to make that concrete.

Example one: a smaller, less active person. Say their TDEE is about 1,800 calories a day. A 500-calorie deficit would mean eating just 1,300, which is low enough to be hard to stick to and hard to hit protein and nutrient needs. For this person, a 250-to-300 deficit, eating around 1,500-1,550 for roughly half a pound a week, is often the smarter, more livable choice. Slower, but far more likely to actually happen.

Example two: a larger, more active person. Say their TDEE is about 2,900 calories a day. A 500-calorie deficit puts them at 2,400, which is plenty of food and easy to live on. They could even run a 750-to-1,000 deficit, eating 1,900-2,150, and aim for one-and-a-half to two pounds a week without feeling deprived, because they have more room to cut. The same deficit that starves the first person barely registers for the second.

That is the real lesson of these examples: the deficit, not the intake, is the lever. "Eat 1,500 calories" is meaningless advice on its own, because for one person it is a gentle cut and for another it is a crash diet. Knowing your own burn first is what turns the 500-calorie rule into a target that fits you.

Why isn't a bigger deficit always better?

If 500 calories loses a pound a week, why not cut 1,500 and lose three? In theory you could; in practice it tends to backfire. The bigger the deficit, the hungrier and more tired you get, and the more likely you are to quit, overeat to compensate, or lose hard-won discipline on a bad day. A deficit you abandon in three weeks loses to a smaller one you keep for six months.

There are physical reasons too. Very aggressive deficits tend to cost you more muscle alongside fat, especially without enough protein and some resistance training. Losing muscle lowers your resting burn, which quietly shrinks future deficits, the opposite of what you want. Adequate protein (often cited around 0.7-1 gram per pound of body weight for people actively losing) helps protect muscle while you cut.

• Sustainability beats speed: a modest deficit you keep outperforms an aggressive one you quit.
• Muscle matters: too steep a cut risks muscle loss, which lowers your burn over time.
• Energy and mood: large deficits often mean poor sleep, low energy, and stronger cravings.
• Adherence is the real variable: the best deficit is the largest one you can hold without breaking.

Why doesn't the scale match the math exactly?

You can run a perfect 500-calorie deficit and still see the scale do something strange: drop three pounds one week, nothing the next, then a pound. That does not mean the math is broken. It means body weight is noisy, and most of that noise has nothing to do with fat.

The biggest culprit is water. A salty meal, a hard workout, hormonal shifts, or more carbohydrate than usual can swing the scale by a few pounds in a day, none of it fat. Glycogen (stored carbohydrate) holds water with it, which is why people see a fast "loss" in the first week of a diet that is mostly water, then a frustrating plateau when it stabilizes. Digestion and what is simply in transit add more day-to-day wobble.

Then there is adaptation and adherence. As you lose weight, you burn slightly less, so a deficit that started at 500 shrinks a little over time, which is why loss often slows after a few months. And honest tracking is hard: small untracked bites, oil, dressings, and underestimated portions can quietly erase a chunk of the deficit. None of this is failure; it is the normal texture of weight loss. The fix is to judge progress over three to four weeks of trend, not day to day, and to keep your logging as honest as you can.

This is where consistent tracking pays off. In NutriNudge you set a calorie and macro goal, log meals (by hand or with the AI photo scanner, which estimates calories and macros from a picture rather than a barcode), and watch your weight trend alongside your streak over weeks. Seeing the smoothed trend instead of a single jumpy number is what keeps a normal water-weight blip from feeling like the diet stopped working.

Is this estimate right for everyone?

No, and this is the honest caveat that matters. Everything above is a general estimate built on population averages and a rule of thumb. Your real numbers depend on your age, sex, body composition, medications, medical conditions, and how your particular body responds, none of which a generic formula can see.

If you have a medical condition, are pregnant or breastfeeding, take medication that affects appetite or metabolism, have a history of disordered eating, or simply want a plan tailored to you, talk to a doctor or a registered dietitian before setting an aggressive target. A professional can account for the things a calculator cannot, and can flag when a deficit that looks fine on paper is a bad idea for you specifically. Use the 500-calorie rule as a sensible starting point, not as medical advice.

The bottom line

To lose about one pound a week, aim for roughly a 500-calorie daily deficit, built on the rule of thumb that a pound of fat stores about 3,500 calories. Estimate your daily burn first, subtract your chosen deficit, and pick a pace you can actually live with: for many people that is the classic 500, but smaller people are often better served by 250-300, and larger, more active people can comfortably go further.

Hold it loosely. The scale will not march down in a neat line because water, digestion, adaptation, and imperfect tracking all add noise. Judge yourself on the multi-week trend, keep the deficit sustainable rather than heroic, protect your muscle with enough protein, and check in with a professional if anything about your situation is out of the ordinary. The math is simple; the patience is the hard part, and the patience is what works.