How to set a calorie target for weight loss without going too low
How many calories should I eat to lose weight? For most adults, about 300 to 500 below maintenance. Here is how to find your own number, check it against a safe floor, and adjust it from real results instead of guesswork.
- Start about 300 to 500 calories below your estimated maintenance. For many adults that lands somewhere between 1,500 and 2,200 calories a day.
- Any calculator gives you an estimate. Your weekly average weight over two to four weeks is the real answer.
- Do not go below about 1,200 calories a day for women or 1,500 for men without medical supervision, and keep protein steady as calories drop.
Start moderate, then let the trend decide
Three decisions cover most of what matters when you set a calorie target for weight loss. Everything else is fine-tuning.
Estimate maintenance, then treat it as a draft
Use a reputable calculator, such as the NIH Body Weight Planner, or the goal setup in your tracking app, to estimate the calories that keep your weight steady. Write it down as a starting point, not a verdict. Formulas can miss by a few hundred calories in either direction, mostly because activity is hard to guess.
Subtract a moderate amount
Take 300 to 500 calories off the estimate, then check the result against the floor of about 1,200 (women) or 1,500 (men). A smaller deficit is easier to sustain and leaves enough food to hit protein and eat with other people. Large cuts tend to produce a strong first week and a rough third week.
Adjust from the trend, not the day
Log most days for two to four weeks, weigh in a few mornings a week, and compare weekly averages. Trending down at a comfortable pace: keep going. Flat for three to four weeks with accurate logging: lower the target by about 100 to 200 calories or add daily movement.
How many calories should I eat to lose weight?
Most adults lose weight steadily by eating about 300 to 500 calories a day below their maintenance calories, the amount that keeps weight stable. For many people that means roughly 1,500 to 2,200 calories a day. Women should generally stay above about 1,200 and men above about 1,500 without medical supervision.
That range is a starting point, not a prescription. Your real number depends on your size, age and how much you move, and the only way to confirm it is to follow a target for a few weeks and watch your weight trend. The rest of this guide shows how to pick the first number and how to adjust it.
How to estimate your maintenance calories
Every calorie calculator uses your age, sex, height, weight and an activity guess to estimate maintenance. Two people with the same inputs can still differ by a few hundred calories a day, so choose the activity level that matches your normal week, not your best one. If you are unsure, pick the lower of two levels.
Here is how that looks for two typical people, using standard formulas:
- A 35-year-old woman, 5 feet 6 inches and 180 pounds, with a desk job and a few walks a week: maintenance about 2,100 calories. Starting target: 1,600 to 1,800.
- A 40-year-old man, 5 feet 10 inches and 220 pounds, lightly active: maintenance about 2,600 calories. Starting target: 2,100 to 2,300.
- A 60-year-old woman, 5 feet 3 inches and 160 pounds, mostly sedentary: maintenance about 1,500. Starting target: about 1,200, right at the floor, so extra walking will do more for her than a deeper cut.
How big should your calorie deficit be?
A deficit of 300 to 500 calories a day produces slow, steady progress while leaving enough food to eat well, train and enjoy meals out. Very aggressive targets look efficient on paper but tend to backfire: hunger climbs, workouts suffer and the week ends with an unplanned rebound.
Where you land in the range depends on your starting point.
- Smaller body or mostly sedentary: lean toward 300, because 500 may push you close to the floor.
- Larger body or very active: 500 is usually comfortable.
- Long history of dieting: start small and prove the target is sustainable before going further.
- Big social weekends: plan a weekly budget rather than a strict daily one, as covered in how to track calories on weekends.
How many calories should I eat to lose a pound a week?
A pound of body fat stores roughly 3,500 calories, so a daily deficit of about 500 calories works out to around a pound a week at first. The CDC notes that people who lose about 1 to 2 pounds a week are more likely to keep the weight off.
Two pounds a week would need a deficit near 1,000 calories a day. That is realistic mainly for larger, more active people, and it should never come from dropping below the calorie floor. For the 220-pound man above, it would mean eating about 1,600 calories: possible, but hard to live with.
Treat the 3,500 rule as a rough guide for the first months only. Research by Kevin Hall and colleagues shows that the body uses less energy as weight comes down, so the same target produces slower loss over time than simple math predicts.
What is the lowest safe calorie intake?
General guidance is not to go below about 1,200 calories a day for women or 1,500 for men without medical supervision. Below that, it becomes hard to get enough protein, fiber and micronutrients, and the diet is much harder to stick to.
Talk to your doctor or a registered dietitian before cutting calories if you are pregnant or breastfeeding, managing a medical condition, taking medication that affects appetite or weight, or have a history of disordered eating.
Protect protein inside your calorie target
When calories drop, protein should not. Enough protein keeps meals filling and helps you keep muscle while the scale goes down. Our guide on how much protein you need to lose weight suggests about 0.7 grams per pound of goal weight as a starting point.
For example, a 1,700-calorie target with a 150-pound goal weight means about 105 grams of protein. That is roughly 420 calories, leaving around 1,280 for carbohydrates and fat. Building meals from lower-calorie recipes with protein listed per serving makes that split easy to hit.
When to change your calorie target
Check your weekly average weight after two to four weeks. Day-to-day swings of a few pounds are mostly water, which is explained in why the scale goes up in a calorie deficit. Judge the average, not one morning.
If the average is falling at a comfortable pace, change nothing. If it is falling faster than 2 pounds a week after the first couple of weeks, or you feel run down, add 100 to 200 calories. If it has been flat for three to four weeks, work through the weight loss plateau checklist before cutting further.
Maintenance also falls as you lose weight, so re-run the calculator after every 10 to 15 pounds. In BiteTracker, the weekly report shows your average calories next to a weight projection, so each adjustment comes from weeks of data rather than one heavy day.
Frequently asked questions
Is 1,200 calories a day enough to lose weight?
For many women, 1,200 calories a day will produce weight loss, but it is the low end of what is generally advised without medical supervision, and too low for most men and active people. Most people do better starting 300 to 500 calories below maintenance and only going lower if the trend stalls.
Should I eat back the calories I burn exercising?
Many people eat back some, not all. Exercise estimates from watches and machines are often generous, so eating back every calorie can erase the deficit. A practical approach is to set your target with your usual activity already included, then add a small snack on unusually hard training days if you are hungry. Our guide on whether to eat back exercise calories explains why.
Why am I not losing weight on 1,500 calories?
Common reasons are underestimated portions, unlogged oils, drinks and weekend meals, less daily movement than before, or a maintenance level lower than the calculator suggested. Check your weekly average over three to four weeks, log one careful week, and then adjust by a small step. See the guide to hidden calories in oils, sauces and drinks.
Do I need to recalculate calories as I lose weight?
Yes. A smaller body burns less energy, so a target that created a 500-calorie deficit at the start may create a much smaller one 20 pounds later. Re-running your calculator every 10 to 15 pounds, and checking your weekly average weight, keeps the target matched to your current body.
Track your calorie target and weight trend in one place
Set a daily calorie and protein goal, log your weight a few times a week, and let the weekly report show your average intake next to a weight projection.
Sources
- Body Weight Planner, National Institute of Diabetes and Digestive and Kidney Diseases (NIH)
- Steps for Losing Weight, Centers for Disease Control and Prevention
- Quantification of the effect of energy imbalance on bodyweight, Hall KD et al., The Lancet, 2011
This article is general information, not medical advice. If you have a health condition, talk to your doctor or a registered dietitian before changing how you eat.