About TDEE.app

I'm Toni. I'm a software engineer who got curious about fitness and nutrition years ago and never really stopped learning about them. TDEE.app is a free calculator I built while trying to figure things out for myself.

My interest in fitness started the way it does for most people — I wanted to look fit and get healthier. I joined a gym, tried to eat more carefully, and waited for things to shift. For a long time, nothing really happened.

What I kept missing was how central diet really was. Training helps, but if you don't have a rough idea of how many calories your body actually burns in a day, you're guessing at everything else. Once I started paying closer attention to that — and to how those calories were split across protein, carbs, and fat — the picture got a lot clearer.

TDEE.app started as a tool I built for myself. I just wanted a simple way to check my numbers without signup forms, ads, or someone trying to sell me a supplement stack. It turned out a lot of people wanted the same thing, so I kept it online and kept refining it. The goal has always been to keep it simple and accessible.

How we write

The articles on this site are written with the help of AI and reviewed before they go live, so the numbers and advice hold up. Every figure cited comes from peer-reviewed research or public data sources. If you ever spot something that doesn't look right, I'd genuinely like to hear about it.

The calculator

The default is the Mifflin-St Jeor equation, which research has shown to be the most accurate BMR estimator for most people. You can also pick Revised Harris-Benedict or Katch-McArdle if you know your body fat percentage. For a longer explanation, the What is TDEE guide walks through it.

Activity multipliers run from 1.2 (sedentary) to 1.9 (very active). They're based on population averages, so use them as a starting point and adjust based on what you actually see on the scale over a few weeks.

Also available

The calculator is available as a free web tool, an iOS app, and a Chrome extension.

Contact

For questions, corrections, or feedback, reach out at [email protected].