It's the number everyone wants but nobody seems to agree on: how many calories should you actually eat in a day? The honest answer is that it depends on you — your body, your activity, and your goal. But it isn't a mystery, and you can land on a solid, personalized number in a couple of minutes.
Here's how daily calorie needs are worked out in 2026, what the numbers mean, and how to find yours.
The short answer
As a rough starting point for adults:
- Most women need somewhere around 1,800–2,200 calories a day to maintain their weight.
- Most men need around 2,200–2,800.
But these are broad averages. A tall, active 25-year-old and a shorter, sedentary 55-year-old can differ by more than 1,000 calories a day. That's why a number based on your details is far more useful than a one-size-fits-all figure.
How your calorie needs are calculated
It comes down to two numbers — BMR and TDEE — and they're less intimidating than they sound.
BMR — your baseline
Your Basal Metabolic Rate is the energy your body burns just staying alive — breathing, pumping blood, keeping warm — if you did nothing all day. It depends mainly on your age, height, weight, and sex, and it's the foundation everything else builds on. You can find yours with the BMR Calculator.
TDEE — the number that counts
Nobody lies perfectly still all day, so we multiply BMR by an activity factor to get your Total Daily Energy Expenditure — the calories you actually burn. This is the figure you care about: eat that much to maintain your weight, less to lose, more to gain.
Putting it together
The most trusted modern method (the Mifflin-St Jeor formula) calculates your BMR, then applies your activity level:
- Sedentary (little or no exercise): BMR × 1.2
- Lightly active (1–3 days a week): BMR × 1.375
- Moderately active (3–5 days a week): BMR × 1.55
- Very active (6–7 days a week): BMR × 1.725
Doing this by hand is fiddly, which is exactly what the Calorie Calculator is for — enter your details and activity level and it gives you your maintenance number plus targets for each goal, in seconds.
Calories by goal
Once you know your maintenance number (your TDEE), adjusting for a goal is simple:
- Lose weight: eat about 300–500 calories below maintenance for a steady, sustainable loss of roughly one pound (about half a kilo) a week. Bigger cuts tend to backfire — they're hard to keep up and cost you muscle.
- Maintain: eat around your TDEE.
- Gain muscle: eat about 250–500 above maintenance, paired with strength training.
Slow and steady wins. A modest deficit you can keep up for months beats a crash diet you abandon in a week.
Calories count — but quality counts too
Hitting a calorie number is the main lever for weight, but what those calories are made of decides how you feel and how well you hold onto muscle:
- Protein keeps you full and protects muscle while you lose fat — most people benefit from making it a priority.
- Fiber from vegetables, fruit, and whole grains keeps hunger down for very few calories.
- Water matters more than people expect; thirst is easily mistaken for hunger. The Water Intake Calculator gives you a daily target.
Curious where you stand overall? The BMI Calculator is a quick way to see whether your weight sits in a healthy range for your height — a useful companion to your calorie number.
Bottom line: there's no single magic number, but there is a right number for you. Find your maintenance calories, nudge them toward your goal, focus on protein and whole foods, and give it time.
Frequently asked questions
Roughly a 500-calorie daily deficit below your maintenance level, because about 3,500 calories equals a pound of fat. Find your maintenance number first with a calculator, then subtract around 500 for a steady, sustainable loss.
1,200 calories is very low for most adults and hard to stick to — it can leave you short on nutrients and energy. Most people lose weight comfortably with a smaller deficit from their real maintenance number. Very low intakes should only be done under medical supervision.
Common reasons include underestimating portions and snacks, a maintenance estimate that's set too high, day-to-day water-weight changes hiding real fat loss, or simply not enough time. Track honestly for two weeks and recalculate before making big changes.
Yes. Metabolism generally slows with age as muscle mass declines, so an older adult usually needs fewer calories than a younger person of the same size. Staying active and doing strength training helps offset the drop.