Calorie Calculator
Estimate your daily calorie needs using BMR formulas and activity level, with weight goals.
About Calorie Calculator
A calorie calculator estimates how much energy your body needs each day, which is the foundation of weight management and fueling for training. Without a baseline number, both diet plans and fitness plans are guesswork built on nothing.
The tool starts with Basal Metabolic Rate (BMR), the calories burned at complete rest, using the Mifflin-St Jeor equation, then multiplies by an activity factor to estimate total daily energy expenditure. These are estimates, not measurements: real needs vary with muscle mass, hormones, and genetics. To lose weight you eat below maintenance and to gain above it, with a modest 10-20% adjustment being the sustainable range.
People managing weight use it to set calorie targets, gym-goers and athletes use it to plan bulking or cutting phases, and nutrition coaches use it as a starting point for client plans. It also answers the question everyone asks when starting a diet: how many calories should I actually eat?
How to Use
- Enter your age, sex, height, and weight.
- Pick your activity level.
- Read your BMR, maintenance calories, and goal targets.
Example
30-year-old woman, 165 cm, 60 kg, moderate activity BMR ≈ 1,365 · Maintenance ≈ 2,116 kcal/day
BMR is what you burn at rest; multiplying by an activity factor estimates total daily needs.
FAQ
What is BMR?
Basal Metabolic Rate — the calories your body burns at complete rest to keep you alive.
Which formula is used?
The Mifflin-St Jeor equation, considered the most accurate standard for most adults.
Are these numbers exact?
No, they're estimates. Real needs vary with muscle mass, hormones, and metabolism — use them as a starting point.
Should I eat exactly the number of calories shown?
Treat it as a starting estimate, not a rule. Track your weight for a couple of weeks and adjust by roughly 100-200 calories based on whether the scale moves as expected. Energy needs vary person to person.
How do I create a safe calorie deficit?
A deficit of about 500 calories per day is commonly recommended for roughly one pound of weight loss per week. Extremely aggressive cuts risk muscle loss and are hard to sustain, so aim for a modest, maintainable deficit.