Your maintenance calorie calculator result is the single most useful number in nutrition: it's the amount of food energy that keeps your body weight exactly where it is right now, no more, no less. Everything else β cutting, bulking, "eating clean," intermittent fasting β is really just a strategy for landing on a calorie number above or below this one.
This free tool from Arb Digital estimates that number using the Mifflin-St Jeor equation, the formula most dietitians and sports nutritionists trust, combined with your activity level. It takes about ten seconds and works in either imperial or metric units.
What This Maintenance Calorie Calculator Does
Enter your weight, height, age, biological sex, and how active you are day to day, and the calculator returns your estimated maintenance calories β the daily intake at which your weight stays flat over time. It also breaks that number down into two parts: your basal metabolic rate (BMR), which is the energy your body burns just existing (breathing, pumping blood, keeping your organs running), and the extra calories added on top for movement and exercise.
Below the main number you'll also see two ready-made reference targets: a moderate cut (your maintenance number minus 500 calories a day, a commonly cited pace for roughly a pound of fat loss per week) and a lean bulk (your maintenance number plus 250 calories a day, a slower surplus aimed at minimizing fat gain while building muscle). Neither of these replaces personalized advice β they're starting points to adjust from.
How to Use It
- Pick your units. Switch between imperial (lbs, feet/inches) and metric (kg, cm) with the toggle β your entries convert automatically.
- Enter your weight, height, and age. Use your current, real numbers, not a goal or past weight β maintenance calories are calculated for the body you have today.
- Select your biological sex. Men and women have different average amounts of lean muscle mass, which the Mifflin-St Jeor formula accounts for with separate constants.
- Choose your activity level honestly. This is the step people get wrong most often β see "Common Mistakes" below.
- Read your maintenance number, then decide your goal. Stay at it to hold your weight, eat below it to lose, or eat above it to gain.
The Formula / How It's Calculated
The calculator first estimates your BMR using the Mifflin-St Jeor equation, which the National Institutes of Health and most modern dietetics research favor over older formulas like Harris-Benedict because it tends to be more accurate for people at a normal-to-overweight body composition:
- Men: BMR = (10 Γ weight in kg) + (6.25 Γ height in cm) β (5 Γ age) + 5
- Women: BMR = (10 Γ weight in kg) + (6.25 Γ height in cm) β (5 Γ age) β 161
That BMR is then multiplied by an activity factor ranging from 1.2 (sedentary) to 1.9 (very active) to produce your Total Daily Energy Expenditure β which is exactly what we're calling "maintenance calories" here, because that's the plain-English meaning of the term. The CDC notes that calorie needs vary widely by individual metabolism, so treat this as a well-informed starting estimate, not a lab-measured fact.
Why Maintenance Calories Are the Anchor for Every Goal
It's easy to think of "losing weight" and "gaining muscle" as two totally different diets. They aren't. Both start from the exact same number β your maintenance calories β and then move in opposite directions from it. Want to lose fat? Eat below maintenance. Want to build muscle with minimal fat gain? Eat slightly above maintenance. Want your weight to simply stay put while you focus on strength training or a busy season of life? Eat at maintenance. Once you know this one number, every other decision becomes a matter of subtraction or addition, not guesswork.
This is also why maintenance calories deserve more attention than they usually get. Most people jump straight to a deficit calculator or a diet app without ever establishing their baseline, so they're essentially guessing at both ends of the math. Nail the maintenance number first, and the deficit or surplus you layer on top becomes far more reliable.
Why Maintenance Calories Drop As You Lose Weight β and Why That Causes Plateaus
Here's the part that trips up almost everyone on a diet: your maintenance calories are not fixed. They fall as your body weight falls, because a smaller body simply requires less energy to run β there's less tissue to fuel, and often less non-exercise movement (fidgeting, walking, general energy) as calorie intake drops, a phenomenon researchers call adaptive thermogenesis.
Say you start at 200 lbs with a maintenance of 2,400 calories, and you eat 1,900 calories a day for a 500-calorie deficit. That works great for the first several weeks. But by the time you've lost 20 lbs, your new maintenance might only be 2,250 calories β which means your "500-calorie deficit" has quietly shrunk to 350. Your weight loss slows down even though you haven't changed a thing about your diet. This is the single most common reason people hit a plateau and assume something is broken. Nothing is broken; your maintenance number simply moved, and the fix is to recalculate it and adjust your intake downward again, or add a bit more activity.
Because of this, it's worth treating your maintenance number as something you re-check periodically β every time you've lost or gained roughly 10-15 lbs, or every four to six weeks during an active diet phase β rather than a number you calculate once and never revisit.
Maintenance vs. TDEE: Same Idea, Different Detail Level
If you've seen the term "TDEE" (Total Daily Energy Expenditure) elsewhere, it's the same underlying concept as maintenance calories β this calculator is simply the plain-language, fast version of it. If you want a deeper breakdown of your energy expenditure with more granular activity-level nuance, our TDEE calculator covers that in more detail. Use whichever framing makes more sense to you; the math underneath is the same.
What Your BMR Number Is Really Telling You
The BMR figure in the results grid often surprises people, because it's usually a bigger number than they expect β frequently 1,400 to 1,800 calories for an average adult, sometimes more. That's the energy cost of simply being alive for 24 hours: your heart beating roughly 100,000 times, your lungs cycling air, your liver and kidneys filtering constantly, your brain running on glucose around the clock, and your body maintaining its core temperature. None of that requires you to move a muscle on purpose, which is why BMR alone usually accounts for 60-75% of total daily calorie burn for people with an average activity level. The remaining slice β the "activity calories added" figure in your results β covers everything from walking to the fridge to a structured workout.
Understanding this split matters because it explains why two people who "exercise the same amount" can still have very different maintenance numbers: a taller, more muscular person has a higher BMR simply because there's more tissue to fuel, independent of how active either person is.
Why Muscle Mass Changes This Number More Than the Scale Does
Two people can weigh the exact same amount on the scale and still have meaningfully different maintenance calories, because muscle tissue burns more energy at rest than fat tissue does. This is one reason strength training is often recommended alongside any calorie target, whether you're cutting, maintaining, or bulking: preserving or building muscle keeps your maintenance number β and therefore your metabolism β higher than it would otherwise be at the same body weight. It's also why maintenance calories calculated from weight and height alone, as this tool does, are an estimate rather than a lab-measured fact; body composition (the ratio of muscle to fat) shifts the true number up or down without changing what the scale shows.
Using This Number Alongside a Food Tracking App
Once you have a maintenance estimate, the most reliable way to confirm it's accurate for you specifically is to log your food intake consistently for two to three weeks at that calorie level while tracking your weight, then compare the two. If your weight stayed essentially flat, the estimate is a good match. If it crept up or down, adjust your daily target by roughly 100-150 calories in the appropriate direction and reassess. This kind of real-world calibration will always beat any formula, because it accounts for the parts of your metabolism β genetics, gut absorption, non-exercise movement like fidgeting β that no calculator can see from a few basic inputs.
Arb Digital builds fast, high-converting websites and free calculators like this one. Explore more of our free tools below.
Try the Detailed TDEE Calculator All Free ToolsCommon Mistakes to Avoid
- Overestimating activity level. "Moderate" activity means structured exercise 3-5 days a week, not a desk job with occasional errands. Most people should select one level lower than they think.
- Using an old weight. Enter today's weight, not the number from six months or six pounds ago β maintenance calories track your current body, not your past one.
- Treating the number as exact. This is an estimate within roughly 10% of your true maintenance level. Track your actual weight over 2-3 weeks at this intake and adjust if it's consistently rising or falling.
- Never recalculating. As explained above, maintenance calories shift as your weight shifts. Recheck this tool periodically instead of using one number for months on end.
- Confusing "maintenance" with "minimum." Eating at maintenance is not restrictive β it's the calorie level for holding steady, which is a perfectly valid goal on its own, especially during muscle-building phases or maintenance breaks from dieting.
Related Free Tools From Arb Digital
Once you know your maintenance number, put it to work with the Calorie Deficit Calculator to plan a fat-loss target, the Weight Loss Calculator to project a timeline, or the Macro Calculator to split those calories into protein, carbs, and fat. If you want the deeper activity-level breakdown behind this same energy math, see the Calorie TDEE Calculator, or check your current weight status with the BMI Calculator. Browse everything in our free online tools hub.
Frequently Asked Questions
Maintenance calories are the number of calories you can eat in a day that keeps your body weight stable over time β you're taking in exactly as much energy as you burn.
It uses the Mifflin-St Jeor equation, one of the most accurate prediction formulas available, but any calculator is an estimate β typically within about 10% of your true number. Use it as a starting point and adjust based on how your actual weight responds over a few weeks.
Yes. TDEE (Total Daily Energy Expenditure) and maintenance calories describe the same number β the calories needed to keep your weight steady. "Maintenance calories" is just the more everyday way of saying it.
Maintenance calories fall as you lose weight and rise as you gain weight, because a bigger or smaller body burns a different amount of energy at rest. Age and changes in activity level shift it too.
Only if your goal is to hold your current weight steady. To lose weight, eat below this number (see our Calorie Deficit Calculator); to gain muscle with minimal fat, eat slightly above it.
Every time you gain or lose around 10-15 lbs, or roughly every 4-6 weeks if you're actively dieting or bulking, since your maintenance level shifts along with your body weight.
This tool provides general estimates for educational purposes only and is not medical advice. Individual needs vary β consult a doctor or registered dietitian before making health, nutrition, or fitness decisions.
