How many calories you should eat per day depends on your age, sex, height, weight, and activity level. There is no single universal number — a 25-year-old male athlete and a 60-year-old sedentary woman have vastly different calorie needs. This guide explains how to find your personal daily calorie target.
General calorie guidelines
As a starting point, health organisations provide broad recommendations based on average adults:
| Group | Sedentary | Moderately active | Very active |
|---|---|---|---|
| Women (19–30) | 1,800–2,000 | 2,000–2,200 | 2,400 |
| Women (31–50) | 1,800 | 2,000 | 2,200 |
| Women (51+) | 1,600 | 1,800 | 2,000–2,200 |
| Men (19–30) | 2,400–2,600 | 2,600–2,800 | 3,000 |
| Men (31–50) | 2,200–2,400 | 2,400–2,600 | 2,800–3,000 |
| Men (51+) | 2,000–2,200 | 2,200–2,400 | 2,400–2,800 |
These are averages. Your personal needs may be significantly higher or lower depending on your body composition, metabolism, and lifestyle.
How to calculate your exact calorie needs
The most accurate way to find your daily calorie target is to calculate your Total Daily Energy Expenditure (TDEE) using a validated formula. The process has two steps:
Step 1: Calculate your BMR
Basal Metabolic Rate (BMR) is the number of calories your body needs at complete rest. The Mifflin-St Jeor equation — the most accurate formula for healthy adults — calculates it as follows:
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
Step 2: Multiply by your activity factor
Your BMR is then multiplied by an activity factor to give your TDEE:
| Activity level | Description | Multiplier |
|---|---|---|
| Sedentary | Desk job, little exercise | × 1.2 |
| Lightly active | 1–3 workouts/week | × 1.375 |
| Moderately active | 3–5 workouts/week | × 1.55 |
| Very active | 6–7 workouts/week | × 1.725 |
| Extremely active | Physical job + training | × 1.9 |
Calorie needs by goal
To maintain weight
Eat at your TDEE. This keeps your weight stable over time. Use our calculator to find your exact maintenance calories.
To lose weight
Eat 300–500 calories below your TDEE. This creates a moderate deficit that produces 0.3–0.5 kg of fat loss per week without excessive hunger or muscle loss. Avoid going more than 500–700 calories below maintenance — larger deficits increase muscle loss and metabolic adaptation.
To gain muscle
Eat 200–350 calories above your TDEE. This moderate surplus supports muscle growth while minimising unnecessary fat gain. More aggressive surpluses do not accelerate muscle building — they only add more fat.
Why calorie needs change over time
Your daily calorie needs are not fixed. They change when:
- Your weight changes — as you lose or gain mass, your BMR adjusts accordingly
- Your activity level changes — more movement means more calories burned
- You age — BMR tends to decline gradually with age, primarily due to muscle loss
- You diet for extended periods — metabolic adaptation reduces calorie burn during prolonged restriction
Recalculate your calorie target every 4–6 weeks, or whenever your weight changes by more than 4–5 kg.
Common calorie mistakes
Eating too little
Very low calorie diets (under 1,200 kcal for women, 1,500 kcal for men) often cause muscle loss, nutrient deficiencies, fatigue, and metabolic slowdown. They are rarely necessary and difficult to sustain.
Underestimating intake
Research shows people underestimate their calorie intake by 20–40% on average. Using a food scale and tracking app for even a few weeks dramatically improves awareness.
Not accounting for liquid calories
Drinks — including coffee with milk, fruit juice, smoothies, sports drinks, and alcohol — can add 300–800 calories per day without contributing much to satiety.