About

Calorie Deck is a small collection of free health, fitness and nutrition calculators. There is no sign-up, nothing is uploaded, and every result is accompanied by the equation that produced it.

Why we publish the formula

Most calculators on the internet hand you a number with no indication of where it came from. That makes it impossible to judge whether the number applies to you. Every tool here names its equation, who published it, and the situations where it tends to break down.

This matters because none of these formulas are precise. The Mifflin-St Jeor equation, the US Navy body fat method and the Devine ideal weight formula are all population averages. They are useful starting points and poor final answers, and you deserve to know which is which.

What we do not collect

• No accounts, no email capture, no newsletter.
• No database. Every calculation happens in your browser.
• Meals logged in the Food Scanner are stored in your browser's local storage and never leave your device.

Accuracy and limitations

Health calculators estimate. They cannot see your muscle mass, your medical history, or how much oil went into your dinner. Photo-based calorie estimation in particular carries large error margins — published testing of commercial apps has found systematic undercounting.

We would rather tell you that plainly than imply a precision these tools do not have.

Who makes this

Calorie Deck is an independent project. If you spot an error in a formula or a result that looks wrong, please get in touch — corrections are genuinely appreciated.