How To Find Out My Maintenance Calories

How to Find Out My Maintenance Calories

That number on the scale isn't moving. You've cut carbs, you stopped eating after 8 PM, you甚至买了那本流行的饮食书. But your body? It's not cooperating.

Here's what's probably happening: you're eating close to your maintenance calories, and you didn't even know it. Or maybe you're eating way below and your body has already adapted, which is a whole other problem.

The truth is, you can't make a smart plan without knowing where you're starting. And that starting point is your maintenance calories — the amount of energy your body burns just keeping you alive and moving through a normal day.

Let's figure out what that number actually is for you.

What Are Maintenance Calories, Exactly?

Maintenance calories — sometimes called total daily energy expenditure (TDEE) — are the total number of calories your body needs to maintain your current weight. Also, not gain. Not lose. Maintain.

This isn't just about what you burn at the gym. It's everything: your heartbeat, your brain activity, your digestion, walking to the bus stop, thinking hard about something, sleeping, everything. Your body runs on energy constantly, even when you're not doing anything visible. Easy to understand, harder to ignore.

The maintenance number is actually made up of a few different pieces:

Basal Metabolic Rate (BMR) — This is what your body burns at complete rest, just to keep organs functioning. It's the largest chunk, usually around 60-70% of your total daily energy. This is what you'd burn if you literally stayed in bed all day.

Thermic Effect of Food (TEF) — The energy used to digest, absorb, and process what you eat. This is why high-protein diets tend to be helpful — protein has a higher thermic effect than carbs or fat.

Physical Activity — Everything from your scheduled workout to fidgeting, climbing stairs, and pacing while you're on calls.

The sum of these three is your TDEE, which equals your maintenance calories.

Why the Term "Maintenance Calories" Can Be Confusing

Here's the thing: maintenance isn't one fixed number. It shifts. Still, your maintenance calories today might be different from your maintenance calories six months ago. Muscle mass changes this. Age changes this. Even cold weather can nudge it slightly higher because your body works harder to maintain temperature.

That's why "finding out" your maintenance calories is really more like estimating them — and then adjusting based on what actually happens.

Why Knowing This Number Actually Matters

You don't need to track calories forever. Some people thrive without it. But understanding your maintenance level changes how you think about food, progress, and setbacks.

If you want to lose weight, you need to eat below maintenance. That's the only way. But here's what most people miss: if you cut too aggressively, your body fights back. Hunger increases, energy drops, and progress stalls. Knowing your maintenance helps you create a deficit that's meaningful without being brutal.

If you want to gain muscle, you need to eat above maintenance. Not massively above — a modest surplus works better than a huge one. Too many calories and you'll gain fat along with muscle. Too few and you won't have the building materials your body needs.

If you're stuck, this is often the first thing to investigate. People assume they're eating less than they are, or assume they're burning more than they are. Getting a concrete number — even an estimate — gives you something to actually work with instead of guessing in the dark.

The practical value is real. Consider this: you're not doing this for the math. You're doing it so you can stop spinning your wheels.

How to Figure Out Your Maintenance Calories

A few ways exist — each with its own place. I'll walk through the most common ones, from most to least accurate.

Step 1: Estimate Your BMR First

Your BMR is the foundation. The most commonly used formula is the Mifflin-St Jeor equation. It looks like this:

For men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) + 5

For more on this topic, read our article on how to find out the mass of an object or check out how many days is 9 months.

For more on this topic, read our article on how to find out the mass of an object or check out how many days is 9 months.

For women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) − 161

Let me make this concrete. Say you're a 35-year-old man, 180 cm tall, 85 kg. Your math would look like:

BMR = (10 × 85) + (6.25 × 180) − (5 × 35) + 5 BMR = 850 + 1125 − 175 + 5 BMR = 1805

So your body burns about 1805 calories just existing.

There's also the Harris-Benedict equation, which was revised in 1984. It's still widely used. But here's my honest take: for most people, the difference between these formulas is small enough that it won't meaningfully change your approach. Pick one and move forward.

Step 2: Apply an Activity Multiplier

Your BMR alone isn't your maintenance. This leads to you need to account for everything else you do. This is where activity multipliers come in.

Here's the standard scale:

• Sedentary (desk job, little to no exercise): BMR × 1.2
• Lightly active (light exercise 1-3 days/week): BMR × 1.375
• Moderately active (moderate exercise 3-5 days/week): BMR × 1.55
• Very active (hard exercise 6-7 days/week): BMR × 1.725
• Extremely active (physical job + hard training): BMR × 1.9

Going back to our example: if that 35-year

Going back to our example: if that 35-year-old man with a BMR of 1805 exercises moderately 3-5 days per week, you'd multiply:

Maintenance = 1805 × 1.55 = 2,797 calories per day

This is your starting point. A rough number, but a real one.

Step 3: Refine With Real-World Data

Here's where most people skip ahead, and it costs them. The formula gives you a starting estimate, but your actual maintenance depends on factors the formula can't capture: your muscle mass, thyroid function, NEAT (non-exercise activity thermogenesis — basically how much you fidget and move around without thinking about it), and even your gut microbiome.

The only way to know for sure is to track. Pick a period — 2-4 weeks works well — and log everything you eat while keeping your activity consistent. Weigh yourself at the same time each day, ideally in the morning after using the bathroom. Look at the trend, not daily fluctuations.

If your weight is stable over those weeks, you've found your maintenance. Consider this: if it's dropping, you're below maintenance. If it's rising, you're above. Adjust accordingly — add or subtract 100-200 calories and repeat. Practical, not theoretical.

This trial-and-error process isn't glamorous, but it's how you get from guesswork to precision.

Other Methods Worth Knowing

Online calculators and apps use these same formulas but automate the math. They're fine for a first estimate, but don't mistake convenience for accuracy. Treat them as a starting point, not a final answer.

Wearable devices like fitness trackers can estimate your daily burn, but they're notoriously imprecise. Studies show they can be off by 20-30% in either direction. Useful for noticing patterns, but not reliable enough to base your nutrition on.

Direct calorimetry — measuring heat output directly — exists in research settings but isn't practical for everyday use.

The Bottom Line

Calculating your maintenance calories isn't a one-time event. Start with a formula, refine with tracking, and adjust as your body changes. On top of that, it's the beginning of an ongoing conversation with your body. Muscle gain, fat loss, aging, and changes in activity all shift the number over time.

The goal isn't perfection. It's having enough information to make decisions with confidence instead of constantly wondering if you're on the right track.

When you know your maintenance, everything else in nutrition starts to make sense. You stop chasing quick fixes and start building something that actually lasts.