Few questions come up more often than "how many calories should I eat to lose weight?" The honest answer is that it depends on your body, your activity, and how quickly you want to make progress. The good news is that you can work out a sensible starting point in a few minutes, then fine-tune it based on what actually happens on the scale over the following weeks.
The basic idea: a calorie deficit
Your body uses energy all day long: to keep your heart beating and your brain working, to digest food, and to move around. When you eat less energy than you use, your body makes up the difference from stored energy, much of it from body fat. That gap between what you burn and what you eat is called a calorie deficit.
Weight loss is not perfectly linear, and water, salt, hormones, and digestion all cause day-to-day swings. But over weeks and months, a consistent deficit is the main driver of fat loss. Every popular diet that works, whether it is low-carb, low-fat, or intermittent fasting, works mainly by helping people eat fewer calories than they burn.
Step 1: Estimate how many calories you burn
The number of calories you burn in a typical day is called your total daily energy expenditure, or TDEE. It has a few parts:
- Basal metabolic rate (BMR): the energy your body uses at complete rest. For most people this is the largest piece.
- Activity: everything from planned workouts to walking around the house, fidgeting, and doing chores.
- The thermic effect of food: the energy used to digest what you eat, a relatively small share.
Our weight loss goal calculator estimates your BMR using the Mifflin-St Jeor equation, which is widely used by dietitians, then multiplies it by an activity factor to estimate your TDEE. You can read more in our articles on what BMR is and TDEE explained.
Keep in mind that any formula is an estimate. Two people with the same age, height, weight, and sex can burn noticeably different amounts. Treat the result as a starting point, not a precise measurement.
Step 2: Choose a moderate deficit
Once you know roughly how much you burn, subtract a deficit to get your daily target. A common rule of thumb is that a deficit of about 500 calories per day leads to roughly one pound (about 0.45 kg) of loss per week, at least in the early stages. This rule is a simplification, because the body adapts as you lose weight, but it is a useful planning tool.
Many health organizations suggest aiming for a gradual loss of around 1 to 2 pounds (about 0.5 to 1 kg) per week. Smaller deficits are easier to stick with, help protect muscle, and make it less likely that you will feel exhausted, irritable, or constantly hungry. Larger deficits can work in the short term but are harder to sustain and carry more risk of nutrient gaps and muscle loss.
Step 3: Watch the lower limits
It is tempting to cut calories as far as possible, but eating too little is counterproductive and can be unsafe. Commonly cited general guidelines suggest that most women should not go below about 1,200 calories per day and most men not below about 1,500 calories per day without medical supervision. Very-low-calorie diets do exist, but they are meant to be done with a doctor's guidance.
Our calculator shows a warning if your target falls below these levels, so you can choose a slower pace instead.
Step 4: Test, then adjust
Your first number is a hypothesis. Follow it consistently for two to three weeks and track your weight several times a week. Then look at the trend rather than individual days:
- Losing about what you expected? Keep going.
- Losing much faster than planned and feeling drained? Add 100 to 200 calories per day.
- No change after three or more weeks of consistent tracking? Double-check your portion sizes and drinks first, then reduce by 100 to 200 calories per day or add more daily movement.
As you lose weight, your body needs a little less energy, so it is normal to recalculate every 10 to 15 pounds (roughly 5 to 7 kg). Rerunning the calculator with your new weight takes less than a minute.
Calories are not the whole story
Calorie targets tell you how much to eat, but food quality affects how easy it is to stay on track. A few habits make a big difference:
- Prioritize protein. Protein tends to be filling and helps protect muscle during weight loss. See our guide to protein for fat loss.
- Fill up on vegetables and fruit. They add volume and fiber for relatively few calories.
- Watch liquid calories. Sugary drinks, specialty coffees, and alcohol add up quickly without making you feel full.
- Keep favorite foods in moderation. Plans that ban everything you enjoy are hard to keep. Fitting treats into your target is often more sustainable.
Tracking without obsessing
You do not have to log every bite forever. Many people find it helpful to track carefully for a few weeks to learn what portions look like, then switch to a lighter approach, such as tracking only on some days or using a consistent set of go-to meals. The goal is awareness, not perfection.
It also helps to remember that a single high-calorie meal does not erase your progress. What matters is the average over weeks. If you go over one day, simply return to your usual plan the next.
When to talk to a professional
You should speak with a doctor or registered dietitian before starting a weight-loss plan if you are pregnant or breastfeeding, under 18, have a history of disordered eating, have diabetes or another medical condition, or take medications that affect appetite or blood sugar. A professional can tailor targets to your situation in a way no online calculator can.
The bottom line
To find how many calories to eat for weight loss, estimate your daily burn, subtract a moderate deficit, stay above sensible minimums, and adjust based on real results. Start with our free weight loss goal calculator to get your personal estimate, a projected goal date, and a simple progress chart.
This article is for general information only and is not medical advice. Talk with a qualified healthcare professional about your individual needs. Last updated November 1, 2026.