If you want to lose weight, gain muscle, or simply stop guessing, there is one number you need first: your maintenance calories. This is the number of calories you can eat each day while keeping your body weight stable. Once you know it, every other decision gets easier, because a cut is simply maintenance minus a deficit, and a bulk is maintenance plus a small surplus.
Learning how to find your maintenance calories is the most useful skill in nutrition, and it does not require a lab test. You can estimate it in two minutes with a calculator, or measure it precisely in two weeks by tracking your food and your weight. This guide shows you both methods, with worked examples, so you can pick the one that fits your life and use the result with confidence.
Want the fast answer? Use our free maintenance calorie calculator to estimate your maintenance level in under a minute. Then read on to learn how to confirm that estimate with real-world tracking, and how to turn it into a cut or bulk that actually works.
Your maintenance calories are the calories your body burns in a typical day. Nutrition scientists call this number your total daily energy expenditure, or TDEE. When the calories you eat match your TDEE, your weight stays roughly the same. Eat consistently less than TDEE, and you lose weight. Eat consistently more, and you gain weight. That simple balance is why maintenance is the baseline for every fat-loss or muscle-gain plan.
TDEE itself is made up of several parts. The largest part is your basal metabolic rate (BMR), the energy you burn just staying alive: breathing, keeping your heart beating, maintaining body temperature, and running your organs. For most adults, BMR accounts for roughly 60 to 70 percent of daily burn. On top of BMR sits the thermic effect of food, the energy used to digest and process what you eat, which is roughly 10 percent of your intake. The rest comes from movement: exercise activity thermogenesis, which is planned workouts, and non-exercise activity thermogenesis (NEAT), which covers everything else, from walking to work to fidgeting at your desk.
Two people who weigh the same can have very different maintenance calories because their activity levels differ. A 180 lb (81.6 kg) office worker who sits most of the day might maintain on about 2,200 calories, while a 180 lb (81.6 kg) warehouse worker who is on their feet all day might maintain on 2,900 calories or more. Age, height, sex, muscle mass, and daily steps all shift the number, which is why a generic chart can only take you so far. Your own maintenance number, measured or carefully estimated, beats any one-size-fits-all figure.
Without a maintenance baseline, most people set their calorie target by copying someone else's plan or by guessing. That is how you end up eating 1,200 calories when you actually need 2,000 to lose weight steadily, or eating 3,000 calories to bulk when your body only needs 2,700. Both mistakes are costly. Too large a deficit leaves you hungry, tired, and likely to quit. Too large a surplus adds more fat than muscle.
Knowing your maintenance level also protects you from panic. Weight fluctuates day to day for reasons that have nothing to do with fat: a salty dinner, a hard workout, a change in fiber or carbohydrate intake, or the normal variation of the menstrual cycle can move the scale by 1 to 3 lbs (0.5 to 1.4 kg) overnight. If you know your maintenance number and you are eating at a planned target, you can trust the process instead of changing your calories every time the scale jumps. The trend over two to four weeks is what matters, not any single weigh-in.
The core idea: maintenance calories equal your TDEE. A calorie deficit below maintenance causes fat loss. A calorie surplus above maintenance causes weight gain. Everything else, from meal timing to macro splits, is secondary to getting this energy balance right.
The 2-week tracking method is the most accurate way to find your maintenance calories without lab equipment. The idea is simple: eat a consistent number of calories every day for two weeks, weigh yourself daily under the same conditions, and use the change in your average weight to work backward to your true maintenance level.
Step 1: Pick a starting intake. Use a calculator estimate as your starting point, or pick a round number close to what you already eat. For this example, suppose you eat 2,400 calories per day. The exact starting number does not need to be perfect, because the method corrects itself.
Step 2: Eat that amount consistently for 14 days. Track everything with a food scale or a tracking app. Aim to hit your target within about 50 calories each day. Keep your activity level as normal as possible. Do not start a new workout program halfway through the test, because a sudden change in activity changes your burn and muddies the result.
Step 3: Weigh yourself every morning. Weigh first thing, after using the bathroom, before eating or drinking, wearing similar clothing. Write down each daily weight. Single weigh-ins are noisy, so you will average them rather than trusting any one day.
Step 4: Compare your weekly averages. Average the weights from days 1 to 7, then average the weights from days 8 to 14. The difference between those two weekly averages is your real weight change for the test period.
Step 5: Convert the weight change into calories. A pound of body fat stores roughly 3,500 calories of energy. If you lost weight, your intake was below maintenance by that amount spread across the 14 days. If you gained weight, your intake was above maintenance. If your weight stayed the same, your intake was your maintenance.
Suppose you ate 2,400 calories per day for 14 days. Your week 1 average weight was 180.0 lbs (81.6 kg). Your week 2 average weight was 179.2 lbs (81.3 kg). You lost 0.8 lbs (0.4 kg) over the test.
The math is straightforward. Multiply the weight lost by 3,500 calories per pound: 0.8 x 3,500 = 2,800 calories of total deficit over 14 days. Divide by 14 days: 2,800 / 14 = 200 calories per day of deficit. Your maintenance is therefore your intake plus the daily deficit: 2,400 + 200 = 2,600 calories per day.
| Result after 14 days | What it means | Your maintenance |
|---|---|---|
| Lost 1.0 lb (0.5 kg) | Daily deficit of 250 calories (3,500 / 14 = 250) | Intake + 250 |
| Lost 0.5 lb (0.2 kg) | Daily deficit of 125 calories (1,750 / 14 = 125) | Intake + 125 |
| Weight stayed the same | No deficit or surplus | Intake = maintenance |
| Gained 0.5 lb (0.2 kg) | Daily surplus of 125 calories | Intake - 125 |
| Gained 1.0 lb (0.5 kg) | Daily surplus of 250 calories | Intake - 250 |
A few practical notes make this method much more reliable. First, two weeks is a minimum. If your weight is noisy, three or four weeks gives a cleaner average. Second, weigh daily rather than once a week, because one high or low day can distort a weekly weigh-in. Third, keep sodium and carbohydrate intake reasonably steady during the test. A sudden jump in carbs can add several pounds of water weight and look like fat gain. Finally, if you are menstruating, compare equivalent phases of your cycle, or run the test across a full cycle, so hormonal water retention does not skew the comparison.
If you do not want to wait two weeks, a calculator gives you a strong estimate right now. Most good calculators use the Mifflin-St Jeor equation, which researchers consider the most accurate widely used formula for estimating BMR from height, weight, age, and sex. The calculator then multiplies BMR by an activity factor to estimate TDEE.
The Mifflin-St Jeor equations are:
Then multiply BMR by an activity multiplier:
| Activity level | Multiplier | Typical day |
|---|---|---|
| Sedentary | 1.2 | Desk job, little exercise |
| Lightly active | 1.375 | Light exercise 1 to 3 days per week |
| Moderately active | 1.55 | Moderate exercise 3 to 5 days per week |
| Very active | 1.725 | Hard exercise 6 to 7 days per week |
| Extra active | 1.9 | Physical job plus daily training, or two-a-day workouts |
Take a 30-year-old man who weighs 180 lbs (81.6 kg) and is 5 ft 10 in (178 cm) tall. First, calculate BMR: (10 x 81.6) = 816. Then (6.25 x 178) = 1,112.5. Then (5 x 30) = 150. So BMR = 816 + 1,112.5 - 150 + 5 = 1,783.5, or about 1,784 calories per day at complete rest.
Next, apply the activity multiplier. If he trains moderately and walks regularly, use 1.55: 1,783.5 x 1.55 = 2,764.4, or about 2,764 calories per day. That is his estimated maintenance level. If he is mostly sedentary, the same BMR with a 1.2 multiplier gives 1,783.5 x 1.2 = 2,140.2, or about 2,140 calories per day. The same body can have a maintenance level hundreds of calories apart depending on daily movement, which is why honest activity selection matters more than decimal-point precision in the formula.
For a deeper breakdown, including a BMR-first view, try our TDEE calculator. It runs the same math and shows how each activity level changes your estimate, which is useful when you are between two activity categories and want to see the range.
Use the calculator when you need a starting point today. Use the 2-week tracking method when you want the most accurate number for your own body. The best approach combines them: start with the calculator estimate, eat at that level for two weeks while weighing daily, then adjust using the tracking math above. That way you get a fast start and a verified number.
Expect the calculator to land within roughly 10 percent of your true maintenance. For a 2,500-calorie maintenance, that means the estimate could be 250 calories high or low. That is normal. Formulas estimate averages, and individuals vary with muscle mass, genetics, medical conditions, and how much they actually move outside the gym. Tracking closes that gap because it measures your body, not an average.
Once you know maintenance, setting a goal becomes arithmetic. Use the table below as a starting point, then adjust based on your results over two to four weeks.
| Goal | Target | Example at 2,764 maintenance |
|---|---|---|
| Maintain weight | Maintenance | About 2,764 calories per day |
| Moderate fat loss | Maintenance - 300 to 500 | 2,264 to 2,464 calories per day |
| Slow, muscle-preserving fat loss | Maintenance - 200 to 300 | 2,464 to 2,564 calories per day |
| Lean muscle gain | Maintenance + 200 to 300 | 2,964 to 3,064 calories per day |
Check the arithmetic on the fat-loss row: 2,764 - 500 = 2,264, and 2,764 - 300 = 2,464. On the muscle-gain row: 2,764 + 200 = 2,964, and 2,764 + 300 = 3,064. A moderate deficit of 400 calories per day produces a weekly deficit of 2,800 calories (400 x 7 = 2,800), which works out to about 0.8 lbs (0.4 kg) of fat loss per week (2,800 / 3,500 = 0.8). That pace is sustainable for most people and preserves more muscle than an aggressive cut.
For a fat-loss plan, pair your maintenance number with our calorie deficit calculator to set the deficit size and project a realistic timeline. For muscle gain, keep protein high, roughly 0.7 to 1.0 grams per pound of body weight per day, and let the small surplus do its work. A 180 lb (81.6 kg) lifter would target about 126 to 180 grams of protein per day (180 x 0.7 = 126; 180 x 1.0 = 180).
Your maintenance number is not fixed for life. It changes as your body and your routine change. The most common reason is weight change itself. A lighter body burns fewer calories, so maintenance falls as you lose weight. A person who maintained at 2,600 calories at 180 lbs (81.6 kg) might maintain at about 2,400 calories after losing 15 lbs (6.8 kg). That is why a diet that worked at first can stall: the deficit shrinks as maintenance drops toward your intake.
Activity changes matter just as much. A new desk job, a move from walking to driving, an injury, or a season with less training can cut several hundred calories from your daily burn without any change in body weight. Metabolic adaptation also plays a smaller role during long diets: after weeks in a deficit, your body becomes slightly more efficient, NEAT tends to drop, and hunger rises. The effect is real but often overstated. Most stalls are explained by lower body weight, less movement, and tracking drift, not a broken metabolism.
Recalculate when: your weight has changed by 10 lbs (4.5 kg) or more, your job or training routine changes, your weight stalls for 3 to 4 weeks despite consistent tracking, or you finish a cut or bulk and need a new baseline. Rechecking takes two minutes with a calculator and two weeks with tracking.
Trusting one weigh-in. Daily weight can swing by 2 to 4 lbs (0.9 to 1.8 kg) from water, food volume, and glycogen. Always compare averages, not single days.
Guessing portions. Studies consistently show people under-report intake. A food scale for two weeks removes most of this error. Sauces, cooking oils, drinks, and bites while cooking all count.
Picking the highest activity level. Most people overestimate activity. If you train three times a week but sit the rest of the day, you are lightly to moderately active, not very active. When in doubt, pick the lower category and let tracking correct you upward.
Changing too many variables at once. If you change calories, training, steps, and sleep in the same week, you will not know which change caused the result. Change one thing at a time and give it two weeks.
Chasing precision you do not need. Maintenance is a range, not a single calorie. A target within about 100 calories of your true maintenance is plenty precise for real-world progress. Consistency beats calculator decimal places.
Disclaimer: This article is for general information only and is not medical advice. Calorie needs vary with health conditions, medications, pregnancy, and other factors, so talk to your doctor or a registered dietitian before changing your diet or exercise routine.
Written by the Live Fitness Check editorial team · Reviewed against our calculator methodology · Last updated October 2026
