Whether your goal is fat loss or muscle gain, it starts with the same number: how many calories does your body actually burn in a day? Get that wrong and everything downstream — your diet plan, your progress tracking — is built on a bad foundation.
Maintenance calories are the number of calories your body burns in a day at your current activity level — the amount needed to maintain your current weight. Eating below this creates a deficit for fat loss; eating above it creates a surplus for muscle gain. Every calorie target for any fitness goal starts from this baseline number.
The most reliable way to estimate maintenance calories uses the Mifflin-St Jeor equation, one of the most accurate formulas available for estimating Basal Metabolic Rate (BMR) — the calories you'd burn lying still all day. From there, BMR gets multiplied by an activity factor based on how much you move day to day, producing your Total Daily Energy Expenditure (TDEE), which is your true maintenance number.
This is a meaningful step up in accuracy from generic online rules of thumb, because it factors in your actual age, height, weight, and sex rather than a flat estimate.
Once you know your maintenance number, fat loss comes from eating consistently below it. A moderate deficit of 300-500 calories below maintenance is a common, sustainable approach — aggressive enough to produce steady fat loss without the muscle loss and metabolic slowdown that comes with extreme deficits.
The same logic runs in reverse for muscle gain: eating above maintenance gives your body the extra energy it needs to build new tissue, on top of what you get from adequate protein intake. Too large a surplus just adds unnecessary fat gain alongside the muscle, so a moderate, controlled surplus tends to produce the best ratio of muscle to fat gained.
Skip the manual math — our free calorie calculator runs the Mifflin-St Jeor equation for you and returns your maintenance number plus fat loss and muscle gain targets, all from your sex, age, height, weight, and activity level.
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