Maintenance Calories
Maintenance Calories. Your maintenance calories are the daily calorie intake at which your body weight stays stable — not gaining, not losing. It's the baseline number around which weight-loss deficits or weight-gain surpluses are calculated.
What are maintenance calories, in plain language?
Maintenance calories are the daily calorie intake that keeps your weight steady. If your maintenance is 2,200 and you eat 2,200 every day on average, your weight stays where it is. Eat less than 2,200 and you’ll typically lose weight; eat more and you’ll typically gain.
It’s a useful baseline because every other calorie target (a 300-calorie deficit, a 200-calorie surplus, a “small cut”) is defined relative to it.
How is maintenance calculated?
Most calorie counter apps estimate your maintenance using one of a few standard equations — Mifflin-St Jeor is the most common — that take your age, sex, height, weight, and activity level as inputs.
The math gives you two numbers:
- BMR (basal metabolic rate): the calories you’d burn at complete rest, lying in bed all day. About 60-70% of total daily calories for most adults.
- TDEE (total daily energy expenditure): BMR multiplied by an activity factor that accounts for how much you move. This is what apps usually call “maintenance.”
The activity factors are typically: 1.2 for sedentary, 1.375 for light activity, 1.55 for moderate activity, 1.725 for very active, 1.9 for extremely active. You pick the one that matches your real life. Most people overestimate this; “moderate activity” is more than most people do.
How accurate is the estimate?
The standard equations are accurate to within about 10% for most adults. For some people they’re closer; for some they’re off by more. Individual physiology varies — metabolic rate isn’t strictly determined by age and weight.
The practical implication is: treat the app’s maintenance number as a starting point, not a final answer. Track your actual eating and weight for 4-6 weeks, then adjust. If your weight is stable while eating the calculated maintenance number, the estimate was right. If you’re slowly losing or gaining despite eating maintenance, the estimate was off — adjust the number to match reality.
Why maintenance changes over time
Your maintenance number isn’t fixed. It changes when:
- Your weight changes. Losing weight reduces your maintenance (a smaller body burns less). Gaining weight increases it. This is why people who lose 30 pounds find their old “maintenance” suddenly causes them to gain — the maintenance shifted.
- Your activity changes. A new job, new exercise routine, or new daily walk all change the activity factor.
- You age. BMR drops slowly through adulthood. The shift is small year-to-year but accumulates.
- Hormonal changes. Menstrual cycles, menopause, thyroid issues, and other hormonal shifts can move maintenance.
For most adults the day-to-day variation is small enough to ignore. The bigger picture matters: a 30-pound weight loss might mean your new maintenance is 200-300 calories below your old one. Apps that re-estimate maintenance as your weight changes (MacroFactor and Carbon do this explicitly; others require you to update manually) handle this more gracefully.
How to use maintenance in calorie counting
Most beginners come at calorie counting in one of two ways:
- Trying to lose weight. Set intake to maintenance minus 300-500 calories. The deficit drives weight loss.
- Trying to maintain or just understand patterns. Set intake to maintenance. Track for awareness without an enforcement frame.
Both are valid. The maintenance number is just the starting point.
For more on tracking deficits, see calorie deficit. For a starter plan, see how to start counting calories without obsessing.
Related ideas
- Calorie — the underlying energy unit.
- Calorie deficit — the deviation from maintenance that drives weight loss.
- Macro — the breakdown of where calories come from.