How many calories should you eat to lose weight

Every calorie target you see online, whether it is 1,200, 1,500, or 1,800, is a guess dressed up as an answer. The real number depends on your body, your activity, and how much weight you actually want to lose and by when. What follows is the reasoning behind that number, so you can build your own instead of borrowing one.

What a calorie deficit actually means

Weight loss comes down to eating fewer calories than your body uses over time. Your body uses calories for basic function (breathing, circulation, cell repair), for digesting food, and for movement, from walking to workouts. Add those together and you get your maintenance calories, often called total daily energy expenditure, or TDEE. A calorie deficit means eating below that number, so your body draws on stored energy to make up the difference.

This is why “eat less, move more” is true but not very useful on its own. It does not tell you less than what, or how much more. The deficit only means something once you know your starting point.

Estimate your maintenance calories first

Most people can get a workable maintenance estimate from an online calculator that asks for age, sex, height, weight, and activity level. Treat the result as a starting point, not a verdict. The formulas behind these calculators are built from population averages, so your real number could sit a few hundred calories on either side.

The more reliable way to find your true maintenance level is to track your food intake and body weight for two to three weeks without trying to change anything. If your weight holds steady, your average daily intake over that window is close to your real maintenance number, no formula required.

A worked example

Say a two-week log shows an average maintenance intake of about 2,400 calories a day with a stable weight. A moderate 500-calorie deficit puts the daily target at 1,900 calories. Over a week, that is a 3,500-calorie shortfall, which lines up with roughly one pound of fat loss, since a pound of body fat holds close to 3,500 calories of stored energy. That math is a useful rule of thumb, not a guarantee: water shifts, digestion, and normal day-to-day variation mean the scale rarely moves in a perfectly straight line, even when the average trend is correct.

How big should the deficit be

A common, sustainable starting point is a deficit of 300 to 500 calories a day, which tends to produce roughly 0.5 to 1 pound of weight loss a week for most adults. A smaller deficit is easier to stick with and preserves more energy for training and daily life. A larger deficit moves the scale faster but is harder to sustain and more likely to cost you muscle along with fat, especially without enough protein and resistance training.

There is rarely a good reason to go below about 1,200 calories a day without guidance from a doctor or registered dietitian. Very low intakes make it hard to get enough protein, vitamins, and minerals, and they tend to backfire through fatigue, cravings, and eventually giving up.

Why the same deficit affects two people differently

Two people eating the same 1,600 calories a day can see very different results, because their maintenance numbers are not the same. A 500-calorie deficit for someone with a 2,600-calorie maintenance level is a much bigger cut, proportionally, than the same deficit for someone maintaining at 3,200. Muscle mass, activity level, sleep, and stress all shift maintenance calories too, which is why a plan built for someone else rarely fits you exactly.

Muscle tissue costs more energy to maintain than fat tissue, so two people at the same body weight can still have different maintenance numbers depending on how much of that weight is muscle. This is one reason strength training tends to help a deficit hold up over time: it protects the muscle that keeps your maintenance number from sliding down as you lose weight.

Protein and training change the equation

The size of your deficit is only half the picture. What you eat inside that deficit matters for how the weight comes off. Getting enough protein helps preserve muscle while you lose fat, and resistance training gives your body a reason to keep that muscle instead of breaking it down for energy. If you want a concrete starting range, see our practical guide to protein targets for weight loss.

Signs your target needs adjusting

A calorie target is a working hypothesis, not a fixed rule. If your weight has not moved in three to four weeks of consistent logging, your true maintenance is probably higher than your estimate, and the target needs to come down slightly. If you are losing weight quickly, feeling constantly drained, or losing strength in the gym, the deficit is likely too aggressive for right now. Adjust in small steps, 100 to 200 calories at a time, and give each change a few weeks before judging it.

Let the numbers do the work

The part that trips most people up is not the math, it is keeping an honest, current picture of what they actually ate. That is what Ojava’s free and paid plans are built to make easy: log meals by photo or by hand, and see a calorie and macro target built from your own body and activity, not a generic template. If you also track wearable and recovery data, Ojava’s fitness features connect training load and recovery to the same picture, so your target can adjust with your training, not against it.

This article is general nutrition education, not individual medical or dietary advice. If you have a health condition, are pregnant or breastfeeding, or are considering a calorie intake below 1,200 a day, talk with a doctor or registered dietitian before changing your diet.