How Does This Calorie Calculator Work?
Enter your age, sex, weight, height, and activity level. The calculator uses the Mifflin-St Jeor equation to estimate BMR, then applies an activity factor to estimate your daily maintenance calories.
How Are Daily Calorie Needs Calculated?
BMR estimates calories used at rest. Multiplying BMR by your selected activity factor gives an estimate of maintenance calories—the daily calories needed to maintain your current weight.
Calories for Weight Loss and Weight Gain
Eating below maintenance calories creates a calorie deficit, while eating above maintenance creates a surplus. This calculator shows example targets about 10% and 20% below or above maintenance.
Frequently Asked Questions
How many calories do I need per day?
Daily calorie needs depend on age, sex, height, weight, and activity level. This calculator estimates your maintenance calories from these factors.
How many calories should I eat to lose weight?
Weight loss generally requires a calorie deficit. The calculator shows example targets below your estimated maintenance calories.
What is the difference between BMR and maintenance calories?
BMR estimates calories your body uses at rest. Maintenance calories include BMR plus energy used for daily activity.
Is this calorie calculator accurate?
It provides an estimate using an established equation. Actual calorie needs can vary with body composition, metabolism, health, and activity.