Is my health data sent to a server?

Calculators run in your browser. Food searches query USDA or Open Food Facts APIs — we do not require an account.

Do I need an account?

No signup is required. All nutrition tools on Online Tool Hub are free to use.

A calorie is a unit of energy. In nutrition, calories measure how much energy your body gets from food and drinks.

Weight change depends on the balance between calories consumed and calories burned.

Not all calories are equal. Whole foods provide fiber, vitamins, and minerals alongside energy.

Free online understanding calories. Learn what calories are and how they affect your body. No signup required — runs in your browser.

What is covered in Understanding Calories?: Learn what calories are and how they affect your body.
Is my health data sent to a server?: Calculators run in your browser. Food searches query USDA or Open Food Facts APIs — we do not require an account.
Do I need an account?: No signup is required. All nutrition tools on Online Tool Hub are free to use.