Maintenance Calories: What They Are and How to Find Yours

Maintenance calories are the number of calories you can eat in a day without gaining or losing weight. Every diet that has ever worked is built on this one number. Eat below it and you lose. Eat above it and you gain. Yet most people who count calories have never worked out their own, and they pick 1,500 or 2,000 because it sounds right.

This guide explains what maintenance calories are, three ways to find yours, from a one-minute calculator to a method that uses your own scale, why the number is different from your friend’s, and how to use it to lose, keep, or gain weight without guessing.

What maintenance calories actually are

Your body burns calories around the clock, and the total for a day has four parts. The largest, 60 to 70 percent, is your basal metabolic rate, the energy it takes to keep you alive at rest: heart, lungs, brain, body heat. Around 10 percent goes to digesting food. The rest is movement, split between deliberate exercise and everything else, walking to the car, standing, fidgeting, cooking. Add them up and you have your total daily energy expenditure, which is the technical name for maintenance calories.

Two people the same height and weight can have maintenance figures 500 calories apart, and the difference is almost always the “everything else” movement, not metabolism. A nurse on her feet for twelve hours burns far more than a programmer of the same size, even if neither sets foot in a gym. That is why honest activity level matters so much when you estimate the number.

How to figure out your maintenance calories

Method 1: the calculator

Our maintenance calorie calculator uses the Mifflin-St Jeor equation, the formula the Academy of Nutrition and Dietetics found most accurate for adults in head-to-head testing. Enter your sex, age, height, weight, and activity level, and it gives your maintenance calories along with targets for losing and gaining weight. It takes a minute and is accurate to within about 10 percent for most people.

Method 2: the formula by hand

If you would rather see the working:

1. Multiply your weight in kilograms by 10.
2. Add 6.25 times your height in centimeters.
3. Subtract 5 times your age in years.
4. Add 5 if you are male or subtract 161 if you are female. That is your resting metabolism.
5. Multiply by 1.2 if you are sedentary, 1.375 if lightly active, 1.55 if moderately active, 1.725 if very active, or 1.9 if you train hard daily or have a physical job.

A 30-year-old man, 5 feet 10 inches and 180 pounds: 82 kg times 10 is 820, plus 178 cm times 6.25 is 1,112, minus 150 for age, plus 5, gives a resting metabolism of about 1,787. If he trains three times a week with a desk job, he is lightly active, and 1,787 times 1.375 is about 2,460 maintenance calories.

Method 3: the two-week test, which beats both

Formulas estimate. Your body knows. For two to three weeks, track everything you eat as accurately as you can and weigh yourself every morning after the bathroom and before breakfast. Average each week’s weight and each week’s calories.

• If your weekly average weight held steady, your average daily calories were your maintenance figure.
• If you lost about a pound a week, your maintenance is roughly 500 calories above what you ate.
• If you gained about a pound a week, it is roughly 500 below.

This method captures everything the formula cannot: your real activity, your real metabolism, and how honestly you log. Most people find their true number is a little lower than the calculator said, because they chose an activity level that was a touch optimistic.

Average maintenance calories by sex and age

As a reference, these are the maintenance ranges for adults of average height and healthy weight, based on the Dietary Guidelines for Americans. The spread in each cell is sedentary to active.

If your calculated number is well outside these ranges, check your inputs and your activity level before you trust it. For a fuller breakdown of how many calories to eat by age, sex, and goal, see our guide to how many calories you should eat a day.

How to use your maintenance calories

To lose weight

Subtract 500 for about a pound a week, or 250 for about half a pound. The smaller deficit is easier to live with and keeps more muscle. Do not go below 1,200 calories a day as a woman or 1,500 as a man without medical advice, because nutrient needs become hard to meet. If your deficit lands under those floors, lose weight more slowly or add movement rather than cutting food further.

To keep your weight

Eat at maintenance. This is the part most diets never teach, and it is why weight comes back. After a diet, your maintenance is lower than it was, because you are lighter. Recalculate at your new weight and eat that, not the number you remember from before.

To gain muscle

Add 250 to 500, train with weights two or three times a week, and eat around 0.7 grams of protein per pound of body weight. More than that surplus mostly adds fat.

Why your maintenance calories change

• Losing weight lowers it. A lighter body costs less to run and to move. Expect maintenance to fall by roughly 10 to 15 calories for every pound lost. Recalculate every 10 pounds or your deficit quietly disappears.
• Dieting itself lowers it a little more. In a long deficit the body economizes: you fidget less, and metabolism drops slightly beyond what weight loss alone explains. This is adaptive thermogenesis. It is real, but modest, usually 5 to 10 percent, and it reverses when you return to maintenance.
• Age lowers it. About 50 to 100 calories a day per decade after your twenties, mostly from lost muscle and reduced activity. Strength training slows both.
• Muscle raises it, slightly. A pound of muscle burns a few more calories a day than a pound of fat, not the 50 that gym folklore claims. Build muscle for strength and health, not as a metabolic shortcut.
• Activity changes everything. Starting a job on your feet, or stopping one, can move maintenance by several hundred calories. Recalculate when your routine changes.

Common mistakes

• Overrating activity. Three workouts a week and a desk job is lightly active, not moderately active. When unsure, pick lower.
• Eating back exercise calories twice. If your activity level already includes your training, adding your watch’s calorie count on top double-counts it.
• Trusting one weigh-in. Daily weight swings two or three pounds with water, salt, and the time of your last meal. Use weekly averages.
• Never updating the number. The figure you calculated a year and 20 pounds ago is wrong now.
• Treating it as exact. 2,143 is not more correct than 2,150. Think in a range of about 100 calories either way.

Eating at maintenance well

Hitting the number is only half the job. The same 2,000 calories can leave you energetic or exhausted depending on what they are made of. Protein at every meal keeps you full and holds muscle. Fiber from vegetables, fruit, beans, and whole grains slows digestion and steadies energy. A breakfast built on oats rather than sugar is one of the easiest wins; our guide to what happens when you eat oatmeal every day explains why. And watch liquid calories, because a couple of sweetened drinks can be 400 calories that do nothing for hunger.

When to talk to a doctor

Get advice before changing your intake if you have diabetes, kidney or heart disease, a thyroid condition, or a history of disordered eating, or if you are pregnant or breastfeeding. See a doctor if you are gaining or losing weight in a way your numbers cannot explain, which can point to a thyroid or other medical cause rather than a counting error.

The bottom line

Maintenance calories are the number everything else depends on. Estimate yours with the calculator, confirm it with two to three weeks of honest tracking and weekly weigh-ins, then eat below it to lose, at it to hold, or above it to gain. Update it as your weight and routine change. Once you know your real number, dieting stops being a guess and becomes simple arithmetic.

Frequently asked questions