Calorie Calculator
Estimate daily calorie needs to maintain, lose, or gain weight based on age, sex, height, weight, and activity.
How it works
- 1
Enter your values in the fields.
- 2
Results update automatically as you type.
- 3
Use Reset to clear and try another scenario.
Why use this calculator
- Maintenance calories
- Loss and gain targets
- Activity levels included
- Not medical advice
How calorie needs are estimated
FlyCalculator estimates BMR with Mifflin-St Jeor, then applies an activity factor for TDEE-style maintenance calories and simple goal offsets.
Use responsibly
Calorie targets vary by health conditions and goals. Treat results as a starting point and consult a professional when needed.
Frequently asked questions
Which formula is used?
Mifflin-St Jeor with common activity multipliers.
Are the loss targets safe for me?
They are generic offsets. Individual needs differ — seek professional guidance.
Does exercise change results?
Yes. Higher activity increases estimated maintenance calories.