How Many Calories Should You Eat to Lose Weight?

Wondering exactly how many calories should I eat to lose weight? If you’re frustrated by finding a different number on every website, you’re not alone. The truth is, there is no universal answer because your ideal intake depends on your unique body and lifestyle. Sustainable weight loss ultimately comes down to calculating and maintaining a safe calorie deficit. In this guide, we’ll show you how to estimate your personalized starting intake, adjust your targets as your body changes, and know when it’s time to consult a healthcare professional.

Starting Points by Current Body Weight

Your starting calorie intake rises with your body weight, and most adults begin about 500 kcal below their estimated maintenance level. A heavier body uses more energy at rest and during movement, so how many calories a day to lose weight is not the same for every person. A 110 kg adult needs far more food than a 65 kg adult, even when both lose weight at the same steady pace.

The table below gives illustrative estimates for a 40-year-old adult. We estimated maintenance with the Mifflin-St Jeor equation, which a systematic review found to be within 10% of measured values more often than other common equations, then applied activity factors of 1.4 (mostly sedentary) and 1.6 (moderately active), two of the levels EFSA uses in its European energy reference values.

Illustrative energy estimates in kcal per day (age 40; women 165 cm, men 178 cm)

Figures are rounded to the nearest 50 kcal, and each additional decade of age lowers them by roughly 70 to 80 kcal. Treat every number as a hypothesis to test, not a prescription. For example, a 65 kg woman with a mostly sedentary routine lands near 1,350 kcal, close to the NHS figure of 1,400 kcal for most women, whereas a 110 kg man lands near 2,300 kcal, well above the NHS figure of 1,900 kcal for most men. Next, we anchor your number in your own data.

Working From Your Own Maintenance Rather Than a Generic Figure

Your own maintenance intake is the number of calories that keeps your weight steady over several weeks, and it is the most reliable anchor for planning a deficit. Calculators estimate it from height, weight, age and sex. Real life adds differences in muscle mass, daily movement, sleep and medication. A measured baseline therefore beats a formula, because it reflects how your body actually behaves.

Once you know your maintenance, setting a deficit is simple. When people ask how many calories for weight loss, the most common answer is to subtract 500 to 600 kcal, the approach behind the NHS weight loss plan, which follows NICE guidance. If your maintenance is 2,200 kcal, a starting target of 1,600 to 1,700 kcal is reasonable. To find a figure you can trust, you need two weeks of honest data, described next.

Establishing a true baseline over two weeks

A true baseline comes from recording what you eat and your morning weight for 14 days while keeping your usual routine. Think of it as an intake audit: the goal is to observe, not to diet. Follow these steps to complete it.

1. Weigh yourself every morning after using the toilet and before eating, using the same scale.
2. Record everything you eat and drink, including oils, sauces, snacks and alcohol, weighing portions with a kitchen scale and using kcal per 100 g, as European labels do.
3. Keep your usual activity, sleep and meal timing for all 14 days.
4. On day 14, calculate your average daily intake and compare your average weight on days 1 to 3 with days 12 to 14.
5. If your weight stayed within about 1 kg (2 lb), your average intake is a good estimate of maintenance. If it drifted further, track one more week.

Research on self-reported eating has long shown that people tend to under-record snacks, drinks and portion sizes. Two full weeks cover two weekends, which matters because weekend and weekday eating often differ. With your own figure in hand, it becomes easier to see why the familiar 1,200 and 1,500 kcal targets so often miss the mark.

Why Generic 1,200 and 1,500 kcal Targets Persist

Generic targets persist because they are simple, easy to remember and were designed for an average person in public health programs, not for individuals. For example, the US National Heart, Lung, and Blood Institute describes 1,200 to 1,500 kcal plans as suitable for most women, and 1,500 to 1,800 kcal plans for men and for heavier or more active women. The NHS plan uses 1,400 kcal for most women and 1,900 kcal for most men.

European food labels reinforce the habit. Regulation (EU) No 1169/2011 sets a reference intake of 8,400 kJ or 2,000 kcal for an average adult, and many shoppers read it as a personal target. It is a labeling benchmark, not individual advice. Units matter too: 1,500 kcal equals about 6,300 kJ, so convert carefully when you compare plans and packages across European countries and American sources.

The main problem is fit. A 1,200 kcal target may suit a small, sedentary woman, yet it can leave a tall or active person with a very large deficit that is hard to sustain and leaves little room to meet nutrient needs. A target that is too low rarely lasts, so watch for the warning signs listed later in this guide. Even a well-chosen number can cost you muscle if the rest of your plan is neglected, so protecting lean tissue comes next.

Protecting Muscle While Losing Fat

You protect muscle during weight loss mainly by eating enough protein, doing regular resistance training and keeping your deficit moderate. Weight lost on the scale is a mix of fat and lean tissue, and a gentler deficit makes it easier to keep the lean part. Muscle supports strength, balance and bone health, especially as you age.

A meta-analysis of randomized trials found that protein intakes above the US recommended allowance of 0.8 g per kg reduced loss of lean mass during energy restriction by about 0.36 kg on average. EFSA’s reference value for adults is 0.83 g per kg. Commonly used practical targets during weight loss are about 1.0 to 1.5 g per kg, but people with kidney disease should not raise protein without medical advice.

For example, an 80 kg adult aiming for 1.2 g per kg would eat about 96 g of protein a day, roughly 25 to 30 g at each of three meals plus a protein-rich snack, from foods such as eggs, Greek yogurt, fish, poultry, tofu or lentils. Protecting muscle is an ongoing task, so we turn next to updating your number.

Muscle protection checklist

• Do muscle-strengthening activity on at least 2 days per week, covering all major muscle groups, as the WHO advises for adults.
• Build toward 150 to 300 minutes of moderate aerobic activity per week, such as brisk walking or cycling.
• Include a protein source at every meal.

Adjusting the Number as Weight Falls

You should review your calorie target about every four weeks, or after every 5 kg (11 lb) lost, because a smaller body burns fewer calories. Some people also show adaptive responses that lower energy expenditure more than body size alone predicts, which is one reason progress slows. Keep goals realistic too, because European obesity guidance regards a loss of 5 to 10% of starting weight as a meaningful, achievable target.

The old rule that a 3,500 kcal deficit equals one pound lost is a rough guide, not a forecast. NIH researchers Kevin Hall and Carson Chow showed that it overestimates results because it ignores how energy balance changes during weight loss. The free NIDDK Body Weight Planner uses a dynamic model that accounts for this. Calculation is only one route to a deficit, so we look at methods without numbers next.

Monthly review

1. Compare your average weight over the last 7 days with the same figure from four weeks ago.
2. If you lost about 0.5 to 1 kg (1 to 2 lb) per week, keep your plan.
3. If loss was slower for three weeks or more, check your records first, then trim 100 to 150 kcal or add activity. A plateau is common and is not a failure.
4. If you lost faster than 1 kg per week beyond the first fortnight, or you feel unwell, add 100 to 200 kcal and speak with a clinician.
5. Recalculate maintenance with your new weight and set your target 500 to 600 kcal below it.

Losing Weight Without Counting Calories

You can lose weight without counting calories by using portion control, food choices and eating routines that lower your intake indirectly. Counting suits some people, but others find it tedious or notice an unhealthy preoccupation with food. Structured habits can create a similar deficit with less mental effort.

Non-counting habits to try

• Fill half of your plate with vegetables, a quarter with protein and a quarter with whole grains or other starchy foods.
• Choose mostly whole or minimally processed foods, which tend to be more filling for the calories they provide.
• Eat slowly, and stop when you feel comfortably full.
• Limit sugary drinks and alcohol, which add calories without much fullness.

These methods work best when you still check results. If your weight trend is not falling after three to four weeks, log meals or weigh portions for a few days. Intermittent patterns such as alternate-day or 5:2 eating are another option, since a 2025 BMJ analysis of 99 trials found similar weight loss to continuous restriction, but they are not suitable for everyone, including people with diabetes who use glucose-lowering medicines, anyone with disordered eating, and pregnant or breastfeeding women. Some people need more support than self-guided methods offer, as the next section explains.

When Weight Loss Should Be Clinically Supervised

Weight loss should be clinically supervised when your health risks are high, when you plan to eat very few calories, or when a condition makes dieting riskier. Very low-calorie diets, which provide under about 800 kcal per day, are used in clinical programs only with medical monitoring, according to the US National Heart, Lung, and Blood Institute. Please speak with a doctor before you start if any of the following applies.

• Your body mass index (BMI) is 40 or higher, or 35 or higher with a weight-related condition (comorbidity), where specialist care, medication or bariatric surgery may be considered.
• You use insulin or other glucose-lowering or blood pressure medicines, whose doses may need adjusting as you lose weight.
• You have heart, kidney or liver disease, gout, or a history of gallstones.
• You are pregnant, breastfeeding or planning a pregnancy.
• You have a current or past eating disorder, or thoughts about food and weight cause you distress.

Prescription options exist too. In the European Union, semaglutide (Wegovy) and tirzepatide (Mounjaro) are authorized for weight management, following evaluation by the European Medicines Agency (EMA), only as an adjunct to a reduced-calorie diet and increased physical activity, in adults with a BMI of 30 or higher, or 27 or higher with at least one weight-related condition. Your care team should set your calorie and protein targets while you use them. Next, we describe what clinical oversight looks like.

Clinical Oversight and When to Seek It

Clinical oversight means that a qualified professional reviews your health, sets safe targets and monitors your progress. In Europe, this is usually your general practitioner, who may refer you to a registered dietitian or a specialist obesity service. In the United States, it is typically your primary care clinician, who may refer you to a registered dietitian nutritionist.

Seek prompt medical advice if you notice

• Dizziness, fainting or a racing heartbeat
• Persistent exhaustion, or feeling cold most of the time
• Missed or irregular periods
• Severe abdominal pain, especially after meals, which can signal gallstones during rapid weight loss
• Weight loss faster than 1 kg (2 lb) per week for several weeks beyond the first fortnight, or weight loss when you are not dieting
• Binge eating, purging, or fear and distress around food

Our guidance draws on the sources listed at the end of this article and is educational only, so it cannot account for your personal history. If you are unsure whether your plan is safe, a short consultation with your doctor or dietitian is always reasonable. Finally, we answer two questions readers often ask.

Weight Loss Calorie Questions

How fast will I lose weight at 1,500 kcal?

How fast you lose weight at 1,500 kcal depends on how far that figure sits below your maintenance, so the same number produces different results in different people. A 65 kg woman with maintenance near 1,850 kcal has a deficit of about 350 kcal and may lose roughly 0.3 kg per week. A 95 kg woman with maintenance near 2,250 kcal has a deficit of about 750 kcal and may lose roughly 0.7 kg per week.

These are simple arithmetic estimates, and real losses usually slow over time. The NHS describes 0.5 to 1 kg per week as a safe, sustainable pace. The first one to two weeks often show larger drops because of water and stored carbohydrate, so do not judge progress by them. For a 110 kg man with maintenance near 2,800 kcal, 1,500 kcal is a deficit of roughly 1,300 kcal, far larger than the 500 to 600 kcal most guidance recommends, so please discuss that plan with a clinician first.

Should my intake differ on training and rest days?

Your intake does not need to differ between training and rest days, because what matters most for weight loss is your average intake across the week. Some people still like calorie cycling, which means eating slightly more on training days and slightly less on rest days. Some find it fits their routine and makes hard sessions feel easier.

Reviews comparing intermittent and continuous calorie restriction find broadly similar weight loss, which suggests that the weekly total matters more than the daily pattern. For example, with a weekly average target of 1,700 kcal, you could eat about 1,800 kcal on three training days and 1,625 kcal on four rest days. Both approaches total 11,900 kcal for the week. If you take insulin or other glucose-lowering medicine, ask your clinician before varying intake from day to day.

In short, how many calories should I eat to lose weight depends on your size, age, sex, activity and health, so we suggest starting about 500 to 600 kcal below your own measured maintenance, protecting muscle with protein and strength training, and reviewing your target as your weight changes. If any warning sign in this guide applies to you, please speak with your doctor or dietitian first. We welcome your questions and experiences in the comments below.