Quick answer: most adult women need about 1,600 to 2,400 calories a day, and most adult men about 2,000 to 3,000, according to the U.S. Dietary Guidelines for Americans. Your own number depends on your age, sex, height, weight and how active you are. For a personal estimate in seconds, use our free calorie calculator.
“How many calories should I eat a day?” sounds like a simple question, but the honest answer is “it depends.” A 25-year-old runner and a 70-year-old who walks a little each day can differ by 1,000 calories or more. This guide shows the typical ranges, explains how your needs are calculated, and walks you through finding the number that fits you, whether you want to lose weight, maintain it or gain.
Average daily calorie needs for adults
The table below shows approximate daily calorie needs for adults at three activity levels. Needs tend to be higher in younger adults and lower in older adults.
| Adults | Sedentary | Moderately active | Active |
|---|---|---|---|
| Women | 1,600 – 2,000 | 1,800 – 2,200 | 2,000 – 2,400 |
| Men | 2,000 – 2,600 | 2,200 – 2,800 | 2,400 – 3,000 |
Approximate ranges based on the U.S. Dietary Guidelines for Americans. Individual needs vary.
How your calorie needs are calculated
Your body burns calories in three main ways: keeping you alive at rest, digesting food, and moving. Calculators combine these into two numbers:
- BMR (basal metabolic rate): the calories you burn at complete rest. You can see yours with our BMR calculator, and learn how it works in our guide What Is BMR?
- TDEE (total daily energy expenditure): your BMR multiplied by an activity factor. This is the number of calories that keeps your weight steady. Try the TDEE calculator or read What Is TDEE?
One of the most trusted ways to estimate BMR is the Mifflin-St Jeor equation: 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5 for men, or − 161 for women. Then you multiply by an activity factor:
| Activity level | Factor |
|---|---|
| Sedentary (little or no exercise) | 1.2 |
| Light (exercise 1–3 days a week) | 1.375 |
| Moderate (exercise 4–5 days a week) | 1.465 |
| Active (daily or intense exercise 3–4 days a week) | 1.55 |
| Very active (intense exercise 6–7 days a week) | 1.725 |
| Extra active (very intense exercise or a physical job) | 1.9 |
Two worked examples
Example 1: a 30-year-old woman, 165 cm, 65 kg, exercising 1–3 days a week. BMR = 10 × 65 + 6.25 × 165 − 5 × 30 − 161 = 1,370 calories. Multiply by 1.375 and her maintenance calories are about 1,884 a day.
Example 2: a 35-year-old man, 180 cm, 80 kg, exercising 4–5 days a week. BMR = 10 × 80 + 6.25 × 180 − 5 × 35 + 5 = 1,755 calories. Multiply by 1.465 and his maintenance calories are about 2,571 a day.
Want your own result without doing the math? Enter your details into the free calorie calculator and you will see your BMR, maintenance calories and targets for losing or gaining weight.
How many calories to lose or gain weight
One pound of body weight is roughly 3,500 calories. That gives a simple rule of thumb:
- Lose about 1 lb (0.45 kg) a week: eat about 500 calories below maintenance each day.
- Gain about 0.5 to 1 lb a week: eat about 250 to 500 calories above maintenance.
Avoid very low intakes. Harvard Health suggests at least 1,200 calories a day for women and 1,500 for men unless a doctor is supervising. If you have a goal weight and date in mind, our weight loss calculator turns them into a daily calorie target and shows whether the pace is realistic. Not sure where you start? Check your BMI first.
Turn calories into protein, carbs and fat
Calories set whether you gain or lose weight, but the mix of protein, carbs and fat affects hunger, energy and muscle. Use the macro calculator to split your calories into grams, and the protein intake calculator to check you are eating enough protein for your goal.
What changes your calorie needs?
- Age: needs usually fall with age as muscle mass and activity drop.
- Sex: men generally burn more than women of the same size.
- Height and weight: bigger bodies need more energy.
- Muscle mass: muscle burns more at rest than fat.
- Activity: workouts and daily movement add up. See how much they burn with the calories burned calculator.
- Health and life stage: pregnancy, breastfeeding, illness and some medications change calorie needs. Ask your doctor or a registered dietitian.
How to find your real number
Any formula gives an estimate, not a promise. A simple way to fine-tune it:
- Start with the calories from the calculator.
- Eat that amount consistently for two to three weeks and weigh yourself at the same time each day.
- Compare your weekly average weight. If it is not moving the way you want, change your intake by 100 to 200 calories and repeat.
Get your personal numbers in under a minute. Free, no sign-up, works on your phone.
Open the Calorie Calculator
Frequently asked questions
How many calories should I eat to lose weight?
Start from your maintenance calories (TDEE) and subtract about 500 calories a day to lose roughly 1 pound a week. Do not go below 1,200 calories (women) or 1,500 calories (men) without medical supervision.
Is 1,200 calories a day enough?
For most adults it is the lowest level generally considered safe without a doctor, and it is too low for many people, especially active ones and men. A smaller deficit you can sustain usually works better.
How many calories do I need to maintain my weight?
Your maintenance calories equal your TDEE: your BMR multiplied by an activity factor. Our calorie calculator and TDEE calculator both give this number.
Do calorie needs change with age?
Yes. Calorie needs generally decline with age because people tend to lose muscle and move less. Staying active and keeping muscle helps slow the drop.
Should I eat back the calories I burn exercising?
If you picked an activity level that already includes your workouts, you do not need to add them again. If you use a sedentary baseline, add a portion of your workout calories and watch your weekly weight trend.
Explore all of our free health and fitness calculators to plan your calories, macros, protein and training in one place.
Sources: U.S. Dietary Guidelines for Americans (dietaryguidelines.gov); Harvard Health Publishing (health.harvard.edu); Mifflin MD et al., “A new predictive equation for resting energy expenditure in healthy individuals,” American Journal of Clinical Nutrition, 1990.
This article is for general information and is not medical advice. Talk to a doctor or registered dietitian before making big changes to your diet.
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