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How Many Calories Should I Eat to Lose Weight?

Find out how many calories to eat to lose weight: the deficit math, how to set your target from TDEE, and how to keep it sustainable.

How many calories should I eat to lose weight?

Most people lose weight steadily eating 300–500 calories below their TDEE — roughly 0.25 to 0.5 kg per week. Your exact number is personal: a smaller sedentary woman might target 1,500, while a larger active man might target 2,400. Calculate TDEE, subtract your deficit, eat mostly whole foods with plenty of protein, and adjust from the two-week trend.

There is no single calorie target that works for everyone. Your calorie needs depend on factors such as body size, age, sex, activity and goals — so the honest answer to "how many calories to lose weight" always starts with your own numbers. A useful starting point is your estimated TDEE, which represents your approximate daily energy expenditure. A calorie deficit occurs when you consume fewer calories than your body uses over time, and the basic formula is: estimated TDEE − planned calorie deficit = approximate daily calorie target.

How the math of fat loss works

One kilogram of body fat stores roughly 7,700 calories of energy, so losing 0.5 kg per week requires a sustained deficit of about 550 calories a day. That's the physics; the physiology is messier, because energy expenditure changes over time and calorie intake is difficult to measure perfectly. Still, the math gives you the right order of magnitude for calories to lose weight, which is why every serious plan starts with TDEE minus deficit rather than a number copied from someone else's diet.

Finding your personal target step by step

First, estimate your TDEE: calculate your BMR and multiply by an activity factor, or use a TDEE calculator directly. Second, choose your deficit — 300 for slow and comfortable, 500 for the standard ~0.5 kg/week pace. Third, set protein at 1.6–2.2 g per kg of body weight to protect muscle. You can use our calorie deficit calculator to estimate a target based on your information. The calculator should be treated as a planning tool rather than a guarantee of weight loss, because actual results can vary — so run the number for two to three weeks before judging it. Remember the question is always how many calories to lose weight for you, not for a statistical average.

Why the scale does not cooperate every week

Weight loss is rarely linear. Glycogen depletion drops several pounds of water in week one; then water, glycogen, food volume and hormonal cycles mask fat loss for days at a time. Your body weight can fluctuate a kilogram or more day to day for reasons that have nothing to do with fat. A calculator provides a starting estimate for calories to lose weight; your longer-term trend provides the real information. Weigh daily, average weekly, and only adjust when the 2–3 week trend stalls.

Making the deficit livable

The best calorie target is one you can actually sustain. Anchor meals around protein (1.6–2.2 g per kg), fill the plate with vegetables and whole foods, keep fiber high, and leave room for foods you enjoy — rigidity is what kills diets, not calories. Rather than making extreme changes, many people benefit from choosing a sustainable approach and monitoring the trend: sleep 7–9 hours, walk daily, lift 2–4 times a week. A 400-calorie deficit you keep for six months beats a 1,000-calorie deficit you abandon in two weeks.

Adjusting your target as you lose weight

Your calories to lose weight shrink as you get lighter — a smaller body burns less, so the target that worked at 90 kg will stall you at 80 kg. Recalculate TDEE every 4–6 weeks or after each 4–5 kg lost, and trim intake by 100–150 calories when the trend flattens. Long diets also trigger mild metabolic adaptation, so planned diet breaks at maintenance every 8–12 weeks can help adherence. Think of your calorie target as a moving number that follows your body down, not a fixed rule you set once.

Related BMITool tools and guides

Estimate your target with the calorie deficit calculator and keep reading in the blog guides.

Key takeaway for How Many Calories Should I Eat to Lose Weight?

Calories to lose weight = your TDEE minus a 300–500 daily deficit, personalized to your size and activity. Set protein high, track the multi-week trend instead of daily weigh-ins, and pick the deficit you can live with — consistency beats intensity every time.

Frequently Asked Questions

Is 1,200 calories a day enough to lose weight?

For very few people — 1,200 is below most adults' BMR and usually unsustainable. Most women do better at 1,400–1,800 and most men at 1,800–2,200 for steady loss. Go lower only with professional guidance.

How fast should I expect to lose weight?

A sustainable pace is 0.25–0.5% of body weight per week — roughly 0.25–0.5 kg for most people. Faster loss usually means more muscle lost and a harder rebound, so the moderate deficit wins long-term.

Why am I not losing weight in a calorie deficit?

The usual suspects: underestimated intake (oils, snacks, weekends), overestimated activity, or too short a timeline. Track honestly for two full weeks before changing anything — most "plateaus" are measurement noise.

Do I need to count calories forever?

No. Counting is a teaching tool: a few months of honest tracking calibrates your portions and food awareness. Many people then maintain with habit-based eating — protein at each meal, sensible portions, regular weigh-ins as the feedback loop.

Should my calorie target change on workout days?

For most people, no — a single daily average for calories to lose weight is simpler and works just as well. Eating back exercise calories often overestimates burn and erases the deficit, so keep one steady target and let training be a bonus.

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