Calorie Calculator
The Calorie Calculator estimates your daily calorie needs based on your BMR and activity level. It helps you understand how many calories you need to maintain, lose, or gain weight.
Calorie Calculator
What the result means
The result is your Total Daily Energy Expenditure (TDEE), which is your BMR plus activity calories. To lose weight, consume fewer calories; to gain, consume more.
How to use this calculator
- 1Select your sex and enter your weight, height and age.
- 2Choose your activity level.
- 3Press Calculate to see your daily calorie needs.
The formula
The calculation uses a standard, verifiable formula. Here it is in its simplest form.
What each variable means
| Symbol | Name | Description |
|---|---|---|
| BMR | BMR | Basal Metabolic Rate. |
| Activity | Activity multiplier | 1.2 to 1.9 based on activity level. |
Step-by-step example
Example: Male, 70kg, 175cm, 30, moderate activity
- 1BMR = 1,649 calories
- 2TDEE = 1,649 × 1.55 = 2,556 calories
Result
≈ 2,556 calories/day
What changes the result
- Activity level is the biggest variable.
- Muscle mass increases calorie needs.
- Age affects metabolic rate.
Edge cases to be aware of
Unusual situations handled correctly
- Very active individuals may have higher needs.
- The estimate may vary by 10-20%.
Common mistakes
Avoid these errors
- Using BMR as total daily calories.
- Overestimating activity level.
Assumptions
- Average body composition.
- Standard metabolic rate.
Limitations
- This is an estimate, not medical advice.
- Individual needs vary significantly.
Key terms to know
Calorie+
Total Daily Energy Expenditure (TDEE)+
Energy balance+
Calorie deficit+
Calorie surplus+
Activity factor+
Real-world scenarios
Maintenance calories
A person's TDEE is estimated at 2,400 calories and they eat roughly 2,400 daily.
What it means: This roughly matches their needs, so weight tends to stay stable. Small daily variations are normal, and the estimate itself can vary by 10-20%.
Gradual weight-loss approach
A person reduces intake from their estimated 2,400 daily needs to 1,900-2,100.
What it means: A 300-500 calorie daily deficit supports gradual loss while helping preserve energy and muscle mass. More extreme deficits are not recommended without guidance.
Changing activity level
The same person moves from a sedentary to an active job.
What it means: Their activity multiplier rises from 1.2 to 1.725, meaning their estimated needs can increase by hundreds of calories. Recalculating after a major lifestyle change improves accuracy.
Individual variation
Two people with the same inputs get the same estimate but respond differently.
What it means: Calorie equations use average assumptions. Real metabolic rates vary, so the estimate is a useful starting reference rather than an exact number.
Related concepts
Basal metabolic rate
Your BMR is the resting foundation of your daily needs. The calorie calculator builds on BMR by adding an activity factor.
Macronutrient targets
Once you know your calorie target, macro planning helps you split those calories into protein, carbohydrate, and fat.
Body Mass Index
BMI helps put your calorie needs in context with your body size and weight category.
Body fat percentage
Body composition affects calorie needs, since muscle burns more at rest than fat. A body-fat estimate can provide useful context.