# Calorie-Deficit.com by GetFIT App > The Calorie Deficit Guides is a free educational resource that explains the science behind calorie deficits, weight loss, and energy balance in simple, evidence-based language. Learn how to calculate your calorie needs, understand maintenance calories, calorie deficits, and surpluses, and discover practical strategies for sustainable fat loss. Whether you're just getting started or looking to deepen your understanding, our guides help you make informed nutrition decisions with confidence. ## Docs - [AGENTS](https://guides.calorie-deficit.com/AGENTS.md) - [About our Web Platform, GetFIT App](https://guides.calorie-deficit.com/about-getfit-app.md) - [Understanding the Calorie Deficit: How is it Calculated?](https://guides.calorie-deficit.com/calorie-deficit-meaning.md) - [Calorie Maintenance](https://guides.calorie-deficit.com/calorie-maintenance-meaning.md) - [Calorie Surpluss](https://guides.calorie-deficit.com/calorie-surpluss-meaning.md) - [GetFIT App Features & Benefits](https://guides.calorie-deficit.com/getfit-app-features-and-benefits.md) - [How to Use GetFIT App's Food Logger Effectively](https://guides.calorie-deficit.com/getfit-app-food-logger-tutorial.md) - [Sign Up and Login to GetFIT App, Our Online Membership Platform](https://guides.calorie-deficit.com/getfit-app-login-and-signup.md) - [How Much Protein Do You Need During a Calorie Deficit? How Do Our Calculations Work?](https://guides.calorie-deficit.com/how-much-protein-is-needed-during-calorie-deficit.md) - [How to use our Calorie Deficit Calculator](https://guides.calorie-deficit.com/how-to-use-our-calorie-calculator.md) - [Calculating Your Daily Calorie Needs for Fat Loss](https://guides.calorie-deficit.com/index.md) - [Untitled page](https://guides.calorie-deficit.com/untitled-page.md) ## Optional - [GetFIT App Home](https://www.joingetfitapp.com/) - [GetFIT App Blog](https://www.joingetfitapp.com/blog) - [Calorie Deficit Calculator](https://calorie-deficit.com/) - [Info & Help](https://www.joingetfitapp.com/info)