How to Calculate Your Maintenance Calories

Ever wonder why you and a friend can eat the same meals but gain or lose weight at different speeds? The answer often comes down to maintenance calories, the number of calories that keeps your weight steady. Once you know that number, you can build a surplus to gain weight or a deficit to lose it. This guide walks through the general two-step method behind that number, plus a worked example you can check by hand.

What Are Maintenance Calories?

Maintenance calories are the number of calories your body needs each day to hold your current weight steady. Eat close to this number and your weight tends to stay about the same over time. Eat above it and you gain weight; eat below it and you lose weight.

This number is different for everyone. It depends on your body size, your age, your sex, and how active you are in a normal week. Maintenance calories are also the starting point for any weight goal, since you adjust up or down from this baseline.

Two people who look similar can still have different maintenance numbers. A taller, more muscular, or more active person usually needs more calories to hold their weight than someone smaller or more sedentary.

The Two-Step Method to Find Maintenance Calories

You do not need a lab test to estimate maintenance calories. Two simple steps give you a solid working number.

Step one finds your BMR, the energy your body burns at complete rest. Step two multiplies that BMR by an activity factor that matches your normal week. The result is your estimated maintenance calories, the number any weight goal is built around.

The flow below shows how those pieces connect, from resting energy all the way to a goal you can act on.

Step 1: Estimate Your BMR

BMR stands for basal metabolic rate. It is the energy your body needs just to breathe, pump blood, and keep your organs running, even if you stayed in bed all day.

A real BMR is worked out from your height, weight, age, and sex, often with a formula like Mifflin-St Jeor. Our Calorie Calculator runs that formula for you and returns a personal BMR in seconds.

For the example in this guide, we use an illustrative BMR of 1,600 calories. Your own BMR could be higher or lower depending on your body, and it is only the first half of the equation below.

Step 2: Apply an Activity Multiplier

Once you have a BMR, multiply it by a factor that reflects your normal activity level. More movement means a higher multiplier and a higher maintenance number.

• Sedentary (little or no exercise): about 1.2
• Lightly active (light exercise 1 to 3 days a week): about 1.375
• Moderately active (moderate exercise 3 to 5 days a week): about 1.55
• Very active (hard exercise 6 to 7 days a week): about 1.725
• Extra active (very hard training or a physical job): about 1.9

Pick the level that matches your typical week, not just your best day at the gym. Most people land somewhere between lightly active and moderately active.

If you sit most of the day and only walk occasionally, sedentary is honest, even if you feel busy. Rate your average week, not your best day.

Worked Example: From BMR to Maintenance Calories

Here is the math using the illustrative BMR of 1,600 calories from Step 1.

At lightly active (1.375), maintenance calories equal 1,600 x 1.375, which is 2,200 calories a day.

At moderately active (1.55), maintenance calories equal 1,600 x 1.55, which is 2,480 calories a day.

Notice the same BMR gives two different maintenance numbers. Activity level, not just body size, changes how much you can eat and still hold a steady weight.

The gap between those two results, 280 calories a day, is roughly one extra snack or a small meal. That is the real weight of one activity level in this simple model.

Common Mistakes When Estimating Maintenance Calories

Even with the right formula, small mistakes can throw off your maintenance estimate. Watch for these common ones.

• Picking too high an activity level. Many people overestimate how active their normal week really is.
• Guessing BMR instead of calculating it. A rough guess can be off by hundreds of calories.
• Forgetting to update the number. An estimate from a year ago may not fit your current body.
• Treating the result as exact. Maintenance calories are a starting estimate, not a lab measurement.

Small errors add up. Picking the wrong activity level alone can shift your estimate by 200 to 400 calories a day for the same BMR, which is enough to stall a genuine goal.

Why Your Maintenance Calories Change over Time

Maintenance calories are not fixed forever. They shift as your body and habits change.

Gaining muscle or becoming more active tends to raise your maintenance number, because a bigger or busier body burns more energy. Losing weight, aging, or becoming less active tends to lower it.

For example, someone who moves from lightly active to moderately active raises their maintenance calories by about 280 calories a day, using the same 1,600 calorie BMR from our worked example.

This is why an old maintenance number can stop working after a few months. Recheck your estimate now and then, especially after a big change in weight, training, or daily routine.

From Maintenance Calories to Your Goal

Maintenance calories are the starting point, not the finish line. Once you know your maintenance number, you can adjust it for a specific goal.

To lose weight, most people eat a bit below maintenance, creating a calorie deficit. To gain weight, most people eat a bit above maintenance, creating a calorie surplus. The right size for that adjustment is its own topic, best planned with our Calorie Calculator or a professional.

A small, steady adjustment is usually easier to stick with than a large one. Big swings above or below maintenance are harder to sustain and can affect energy, mood, and health.

Related Calorie and Nutrition Topics

Maintenance calories are just the starting point. A few related topics build on this number once you have it.

• Want to know how many calories a workout adds on top of your daily total? See How to Calculate Calories Burned in a Workout.
• Curious if meal timing changes how your body uses protein? Read Protein Timing: Does It Matter?.
• Thinking about eating in a shorter window each day? Check Intermittent Fasting Windows Explained.

Frequently Asked Questions About Maintenance Calories

Sources

This article is for general education only, not medical advice. Nutrition needs vary by person, so talk with a doctor or a registered dietitian before making changes to your diet or health routine. Reviewed for accuracy by Dr. Abdullah Khalil, MBBS. Last updated September 12, 2026.