There is no single magic number. Answering how many calories should I eat to lose weight comes down to a short calculation: estimate your total daily energy expenditure, subtract a deficit of roughly 300 to 500 calories a day, and never eat below a safe minimum. For most adults that lands somewhere between 1,200 and 2,200 calories a day depending on your size, age and how much you move.
This guide walks through that method, shows two worked examples from different body sizes, and covers what to do when the scale stops moving. It is general information rather than personal advice, so talk to a doctor or registered dietitian if you have a medical condition, are pregnant or breastfeeding, or have a history of disordered eating.
Table of Contents
- How Many Calories Should I Eat to Lose Weight?
- How to Calculate Your Daily Calorie Needs
- Which Calorie Deficit Is Right for You?
- How Many Calories Should I Eat to Lose Weight? Two Worked Examples
- What Factors Change Your Calorie Needs?
- How to Create a Calorie Deficit Without Extreme Dieting
- How to Track Your Intake and Weight Progress
- When to Adjust Your Calorie Target
- Frequently Asked Questions
- Is 1200 calories a day enough to lose weight?
- Is 1500 calories a day too much to lose weight?
- Why am I not losing weight on 1400 calories a day?
- How many calories do I need to lose 2 pounds a week?
- How long would it take to lose 20 pounds on 1000 calories a day?
- Do I need to count calories to lose weight?
- Conclusion: Start With a Sustainable Calorie Target
How Many Calories Should I Eat to Lose Weight?
Start by finding your maintenance calories: the number that keeps your weight steady. Subtract a deficit of 300 to 500 calories and that becomes your daily target. A 500-calorie deficit is the classic figure because it works out to roughly a pound of fat loss per week.
Three steps cover it:
- Estimate your maintenance calories using your weight, height, age and an activity multiplier.
- Subtract 300 to 500 calories to create the deficit. Smaller deficits hold up better over months.
- Respect the floor of 1,200 calories a day for women and 1,500 for men, unless a doctor advises otherwise.
Everything else in this article is detail on those three lines.
How to Calculate Your Daily Calorie Needs
Two numbers matter here. Maintenance calories are what you eat to hold your current weight. Weight-loss calories are maintenance minus a deficit. Everything else is a way of estimating the first number well enough to work with.
The most widely used estimate is the Mifflin-St Jeor equation, which is more accurate than the older Harris-Benedict formula. You need your weight in kilograms, your height in centimetres and your age in years.
| Who | Mifflin-St Jeor formula |
|---|---|
| Women | (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161 |
| Men | (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5 |
That result is your basal metabolic rate, the energy your body burns just to stay alive. To get total daily energy expenditure, multiply it by an activity factor.
| Multiplier | Activity level | What that looks like |
|---|---|---|
| 1.2 | Sedentary | Desk job, little deliberate exercise |
| 1.375 | Lightly active | Exercise 1 to 3 days a week |
| 1.55 | Moderately active | Exercise 3 to 5 days a week |
| 1.725 | Very active | Hard exercise 6 to 7 days a week |
| 1.9 | Extra active | Physical job or twice-a-day training |
If you are not sure where you sit, pick the lower number. Experienced posters on r/loseit make the same point constantly: most people pick the “lightly active” multiplier when their real-world movement is closer to sedentary, and the error compounds into an inflated estimate.
Online TDEE calculators are a reasonable starting point and a poor final answer. Treat any single number as a hypothesis you test against the scale over several weeks, not a verdict.
| Approach | Daily deficit | Typical pace | Who it suits |
|---|---|---|---|
| Maintenance | 0 | No change | Starting point for the calculation |
| Moderate loss | 250 to 400 calories, or 10 to 15% | About 0.5 lb a week | Most people, especially anyone who has stalled before |
| Standard loss | 500 calories, or about 20% | About 1 lb a week | Plenty of room between maintenance and the floor |
| Faster loss | 750 to 1,000 calories | About 1.5 to 2 lb a week | Short-term, supervised, and only with a lot of headroom |
Members of r/loseit repeatedly report that the smaller deficits are the ones they can hold for months, while the big ones work for a few weeks and then collapse into tracking fatigue.
Which Calorie Deficit Is Right for You?
A calorie deficit simply means eating less than your body spends. The three ways to create one are eating less, moving more, or a mix of the two. You can measure a deficit in calories per day or as a percentage of maintenance, and 10 to 20% below maintenance is the range most dietitians describe as moderate.
Smaller deficits tend to survive longer because you are not fighting your own hunger signals every hour of the day. A 300-calorie cut is often a portion change and a swapped drink, which is unremarkable. A 1,000-calorie cut is most of your food, and that is a different kind of life.
One more caveat about reading the scale. Weight change is not a clean readout of fat loss. Higher-carb meals, salt, bowel contents, menstrual cycle water and the after-effects of a hard training session can move the number by two to four pounds without a single ounce of fat changing. Look at the trend line over three to four weeks, never a single morning reading.
How Many Calories Should I Eat to Lose Weight? Two Worked Examples
These are illustrative only. Your own numbers will differ, and the point is to show the arithmetic rather than to hand you a target.
Example one, an average woman. Age 35, 5 foot 5, 150 lb (68 kg), exercising twice a week. Baseline: 10 × 68 = 680. Height: 6.25 × 165 = 1,031. Age: 5 × 35 = 175. Total: 680 + 1,031 − 175 − 161 = 1,375. Multiply by 1.375 for lightly active: roughly 1,890 maintenance calories. Subtract a 400-calorie deficit and her target is about 1,490 calories a day, which sits comfortably above the 1,200 floor.
Example two, a smaller frame. Age 28, 5 foot 2, 125 lb (57 kg), desk job. Baseline: 570. Height: 6.25 × 157 = 981. Age: 140. Total: 570 + 981 − 140 − 161 = 1,250. Multiply by 1.2 for sedentary: 1,500 maintenance calories. A 300-calorie deficit gives 1,200, which is exactly the floor. At 5 foot 2 and 125 lb there is very little room between a sensible deficit and a restrictive one, and this is the situation people post about most often in r/PetiteFitness.
That second example is worth pausing on. When your estimated maintenance is only a few hundred calories above the minimum, the deficit has to be small, and the strategy has to lean on food quality and movement rather than on cutting more food.
What Factors Change Your Calorie Needs?
Body size. Heavier bodies carry more tissue to maintain, so they burn more at rest. This is why a 250-pound person and a 130-pound person with identical lifestyles have completely different numbers.
Age. Requirements drift downward with age, mostly because muscle mass tends to fall. The formula accounts for this crudely through the age term; in practice a 55-year-old lifter and a 30-year-old desk worker with the same weight can have similar needs.
Sex. Average, not absolute. The difference comes largely from average body composition, and the gap narrows once you account for lean mass.
Basal metabolic rate. This is the floor of your expenditure and it varies several hundred calories between people of identical size and age. It is also the least measurable number in the whole calculation.
Daily activity outside the gym. Walking, housework, standing, commuting, dog walking. Non-exercise activity often outweighs a workout, and most estimates undercount it badly.
Training load. Resistance training and long sessions raise expenditure, sometimes enough to offset a portion of a deficit. If you add four lifting sessions a week, your multiplier should move up rather than stay put. People in r/gymgeek often stall because they start training and leave their calorie target untouched.
Pregnancy and breastfeeding. Needs rise substantially and the usual formulas do not apply. This is a conversation for a doctor or a registered dietitian, not a spreadsheet.
Health and medication. Thyroid conditions, insulin resistance, anaemia, PCOS, digestive disorders and medications such as stimulants or steroids can all shift your expenditure. Estimating around these is guesswork with stakes attached, so get medical input first.
How to Create a Calorie Deficit Without Extreme Dieting
The goal is a deficit you barely notice on a normal day. These are the changes that tend to hold.
- Eat more protein. Aim for roughly 1.6 to 2.2 g per kg of body weight a day, spread across meals of 20 to 30 g. Protein is the most satiating macronutrient and it protects lean mass while you are in a deficit.
- Favour volume. Vegetables, fruit, soups and salads add bulk and fibre for few calories, which is what makes a lower target tolerable rather than punishing.
- Drink water before meals. A glass of water and ten minutes of waiting takes the edge off hunger often enough to remove an unnecessary snack.
- Add fibre slowly. Beans, oats, whole grains and seeds. Go up gradually, because a sudden jump causes bloating that gets mistaken for fat gain.
- Trim the invisible calories. Oils, dressings, sauces and drinks are the usual culprits. For most people, tracking error is worth 300 to 500 calories a day, which is the difference between a plateau and progress.
- Strength train two to four times a week. It protects muscle, and muscle is what keeps your expenditure high as you lose weight.
- Move daily. Walking after meals, stairs, a longer lunch break. Small and boring, and it adds up.
- Plan the weekend in advance. Social eating is where most deficits quietly end. Decide what you will eat before you go, rather than deciding at the table.
Two habits deserve their own warning. Counting calories can turn into obsessive tracking, and in a study of 1,800 participants published in the Journal of Nutrition and Dietetics, focusing on menu calorie labels was linked with more binge eating. The same research consistently shows 1,200 calories a day is difficult for most people to sustain, which is a practical point, not just a nutritional one.
Supplements and fat burners are not shortcuts. A 700-calorie diet, which comes up repeatedly as something a doctor has recommended to people in r/PetiteFitness, is well below any general floor and needs professional supervision if it is happening at all. If a number someone gave you sounds extreme, that is a reason to ask questions rather than to try harder.
How to Track Your Intake and Weight Progress
Give tracking a two-week trial before deciding whether you hate it. Long enough to see the pattern, short enough to abandon without guilt if it is clearly wrong for you.
On the food side: weigh portions for the first week or two, mostly to calibrate your eye, which is usually worse than you think. Log everything including oils and drinks. A pattern of tracking on weekdays and forgetting on weekends is the single most common reason a deficit stops being a deficit, and it is worth fixing before you adjust calories.
On the activity side: write down your training and your daily steps. An app that counts steps is good enough. The goal is not precision, it is noticing that a low-calorie day got paired with a 12,000-step weekend.
On the weight side: weigh in daily under the same conditions, then only look at the weekly average. Judge progress over three weeks minimum. Adjusting after four bad days is how people end up eating 1,000 calories a day by accident.
Here is the sanity check experienced forum users actually use. If your true maintenance is around 2,200 and you are eating 1,800, you should see roughly 0.9 lb a week coming off. If four weeks of that pattern produce nothing, one of three things is true: your maintenance estimate is wrong, your logging is wrong, or water weight is masking it. Sort those out in that order.
Tracking is optional. Plenty of people lose weight well without counting, particularly those who have already done it and know their patterns. If counting brings back difficult feelings around food, structured plate methods and intuitive eating approaches are a legitimate path, and worth discussing with a registered dietitian.
When to Adjust Your Calorie Target
Your maintenance number is not fixed. As you lose weight, you get lighter, you burn slightly less, and the same target quietly stops working. Most mid-diet plateaus trace back to a target that was right for the person you were ten pounds ago.
Recalculate when you have lost 5 to 10% of your starting weight, when progress stops for two to three weeks, or when your activity level changed materially. Adjusting means either trimming a further 100 to 200 calories or adding movement. For most people, adding movement is the better lever because it protects muscle and does not compete with recovery or mood.
Two weeks is a useful reset. Recalculate, add a short burst of extra activity, eat at maintenance for a week or two, then re-enter the deficit. Users who break plateaus most often attribute it to portion control, refined carbohydrate and sleep rather than to cutting harder, which matches what the physiology would predict.
Two habits get mentioned constantly in forum threads: a lot of people use the 7,700 calories per kilogram figure when they should be working in 3,500 calories per pound, and people on a plateau almost always try to cut more. The second is nearly always the wrong first move.
Know your floor, and know when to stop. The widely cited minimums are 1,200 calories a day for women and 1,500 for men, and they assume an average adult. Under-eating shows up as fatigue, feeling cold all the time, poor sleep, brain fog, hair loss, and for women, changes to or loss of the menstrual cycle. A registered menstrual change is a clear signal to stop dieting and speak to a doctor. So is feeling light-headed, or struggling to focus at work.
Anyone managing diabetes, kidney disease, heart conditions, a thyroid disorder, an eating disorder history, or pregnancy should not run a calorie deficit on the general information in this article. Those cases belong with a doctor or a registered dietitian who can adjust for medications and clinical needs.
Frequently Asked Questions
Is 1200 calories a day enough to lose weight?
For many adult women 1,200 calories a day does produce weight loss, since average maintenance often sits between 1,500 and 2,000. But it is the commonly cited floor, not a comfortable target, and most people find it hard to sustain. A smaller deficit from a higher maintenance number is usually easier to hold. Eat above it unless a doctor tells you otherwise.
Is 1500 calories a day too much to lose weight?
Only if 1,500 is at or above your maintenance, in which case you would maintain rather than lose. For a woman whose maintenance is around 1,900, 1,500 is a sensible 400-calorie deficit. For a shorter woman whose maintenance is 1,450, it is barely a deficit. Compare the number to your own estimate, not to someone else’s progress.
Why am I not losing weight on 1400 calories a day?
Three causes account for most cases. First, your maintenance estimate was too low, so 1,400 was never a real deficit. Second, tracking missed calories, usually oil, sauces, drinks or weekend meals. Third, water weight is masking fat loss, which is common after a high-carb meal, a new training routine or a salty meal. Check each in that order over three weeks before cutting further.
How many calories do I need to lose 2 pounds a week?
At roughly 3,500 calories per pound of fat, losing 2 pounds a week needs a daily deficit near 1,000 calories. That is aggressive, and for many people it means eating close to the minimum safe floor. People who sustain it usually pair it with resistance training and higher protein. A rate around 0.5 to 1 lb a week is easier to hold for months.
How long would it take to lose 20 pounds on 1000 calories a day?
Simple arithmetic on the 3,500-calorie rule gives about 70 weeks, but the rule overstates early loss and understates later loss, so the real figure differs. More importantly, 1,000 calories a day is below the general floor for both women and men, and it is not a level to plan around without medical supervision. Work out your maintenance first.
Do I need to count calories to lose weight?
No. Calorie counting is one tool, not a requirement, and plenty of people lose weight with portion control, protein targets and consistent meals. It is useful when you genuinely cannot tell whether you are in a deficit. Research links heavy focus on calorie labels with more binge eating, so if counting brings up hard feelings about food, structured plate methods work just as well.
Conclusion: Start With a Sustainable Calorie Target
Working out how many calories should I eat to lose weight in practice is mostly arithmetic, not restriction: estimate your maintenance calories with the Mifflin-St Jeor equation and a conservative activity multiplier, subtract 300 to 500 calories, and check the result against the floor of 1,200 for women or 1,500 for men. Then track food and weight for two weeks, judge the trend rather than the day, and adjust by 100 to 200 calories or by adding movement rather than by cutting harder.
Build the plan around protein, fibre, water and food you actually enjoy eating, and treat sleep and training as part of the same job. If you have a medical condition, are pregnant, or have struggled with restrictive eating before, get individual guidance from a doctor or registered dietitian before you set a number. This guide is general information and not a prescription.
