Most people will lose weight eating between 1,400 and 2,000 calories per day, depending on their size, age, sex, and activity level. The specific number that works for you depends on how many calories your body burns in a day and how large a deficit you create below that number. Cutting roughly 500 calories per day from your usual intake typically produces about half a pound to one pound of weight loss per week.
How Your Body Burns Calories
Your total daily energy expenditure has three main components. The largest is your resting metabolic rate, which covers basic functions like breathing, circulating blood, and maintaining body temperature. This accounts for roughly 60 to 70 percent of all the calories you burn in a day. Digesting and absorbing food takes up about 10 percent. The remainder comes from physical activity, both structured exercise and all the smaller movements you make throughout the day.
That last category is more significant than most people realize. Non-exercise activity thermogenesis, the energy you burn through fidgeting, walking to the kitchen, standing, and other everyday movement, can vary by up to 2,000 calories per day between two people of similar size. This is one reason two people with the same height and weight can maintain very different calorie levels. Someone with an active job who walks frequently throughout the day may burn several hundred more calories than someone who sits at a desk for eight hours.
Finding Your Calorie Target
The starting point is estimating how many calories your body burns daily, then subtracting enough to create a consistent deficit. Most online calculators use the Mifflin-St Jeor equation to estimate your resting metabolic rate, then multiply by an activity factor. A systematic review in the Journal of the American Dietetic Association found this equation to be the most reliable option, predicting resting metabolic rate within 10 percent of the measured value in more people than competing formulas.
As a rough framework, here’s what typical maintenance calorie levels look like for adults:
- Sedentary women: 1,600 to 2,000 calories per day
- Sedentary men: 2,000 to 2,400 calories per day
- Active women: 2,000 to 2,400 calories per day
- Active men: 2,400 to 3,000 calories per day
To lose about half a pound to one pound per week, you’d subtract around 500 calories from your maintenance level. A sedentary woman maintaining at 1,800 calories, for example, would target roughly 1,300 calories. A moderately active man maintaining at 2,600 would aim for about 2,100.
Calorie Floors You Shouldn’t Go Below
Harvard Health recommends that women not go below 1,200 calories per day and men not go below 1,500 calories per day without medical supervision. Eating below these thresholds makes it very difficult to get adequate vitamins, minerals, protein, and fiber from food alone. Chronically undereating also increases the risk of muscle loss, fatigue, hair thinning, and hormonal disruption. Losing weight slightly slower on adequate calories is safer and more sustainable than aggressive restriction.
Why the “3,500 Calories Per Pound” Rule Is Misleading
You’ve probably heard that cutting 3,500 calories equals one pound of fat loss. This rule has been widely repeated for decades, but research has shown it significantly overpredicts how much weight people actually lose. When researchers tested it against data from seven closely monitored weight loss studies, most participants lost considerably less than the rule predicted, and weight loss slowed as the weeks went on.
There are two main reasons the math doesn’t hold up neatly. First, as you lose even a small amount of weight, your body needs fewer calories to sustain itself. The deficit that helped you lose the first five pounds gradually shrinks unless you adjust your intake or activity. Second, the same calorie cut produces different results in different people. Men tend to lose faster than women. Younger adults lose faster than older adults. And individuals within those groups still vary. The National Institutes of Health offers a free online Body Weight Simulator that accounts for these dynamics and gives more realistic projections than the old rule of thumb.
Metabolic Adaptation and Plateaus
When you eat less for an extended period, your body doesn’t just burn fewer calories because you weigh less. It actively downshifts its energy expenditure beyond what the weight change alone would explain. This phenomenon, called adaptive thermogenesis, means your metabolism becomes more efficient at conserving energy, creating an environment that favors weight regain. It’s one of the key reasons people hit frustrating plateaus after several weeks of consistent dieting.
Adaptive thermogenesis doesn’t make weight loss impossible, but it does mean that a calorie target producing steady loss in month one may stop working by month three. Periodic diet breaks, where you eat at maintenance for a week or two before returning to your deficit, are one strategy people use to manage this. Keeping protein intake relatively high also appears to help counteract the metabolic slowdown during and after weight loss, according to research from the American Society for Nutrition.
Making Your Deficit Sustainable
The best calorie target is one you can maintain consistently without feeling miserable. A 500-calorie daily deficit is popular because it’s aggressive enough to produce visible results within a few weeks but moderate enough that most people can stick with it. Larger deficits, like 750 to 1,000 calories per day, speed up initial loss but also increase hunger, fatigue, and the likelihood of quitting.
You can create your deficit entirely through eating less, entirely through moving more, or through a combination. In practice, combining both tends to work best. Cutting 300 calories from food and burning an extra 200 through walking, for instance, feels easier than trying to cut 500 from food alone. Increasing your everyday movement (taking stairs, walking after meals, standing more) can meaningfully boost your calorie burn without requiring dedicated workout time.
Tracking calories with an app for even a few weeks helps most people identify where their biggest calorie sources are. Many people discover that drinks, cooking oils, snacks, and portion sizes account for far more than they expected. You don’t necessarily need to track forever, but having an accurate picture of your starting point makes it much easier to find a realistic target and stay there.