Free, accurate, science-based fitness calculators for everyone.
We built TDEE Cal Hub to provide free, accurate, science-based calorie and fitness calculators — no sign-ups, no ads, no fluff.
Too many fitness tools online are either locked behind paywalls, riddled with ads, or use questionable math. We believe everyone deserves access to reliable tools that help them understand their body's energy needs — backed by real science and completely free to use.
Our suite of calculators covers the key metrics you need for informed nutrition and fitness decisions:
Every calculator on this site is built on peer-reviewed scientific formulas. We use the Mifflin-St Jeor equation (recommended by the Academy of Nutrition and Dietetics) as our primary BMR formula, the Katch-McArdle equation when body fat data is available, and the US Navy Method for body fat estimation.
We don't just plug in formulas and call it a day. We clearly document our methodology, show the math, cite our sources, and openly discuss the limitations of each calculation. Transparency matters.
All calculator inputs are processed entirely in your browser. We don't collect, store, or transmit your personal health data.
Our content is researched and written by a team with backgrounds in nutrition science, exercise physiology, and data analysis. Every calculator is validated against published equations and tested for accuracy.
We stay current with the latest research in metabolism, body composition, and energy expenditure to ensure our tools reflect the best available science.
Want to understand the science behind our calculators? Visit our Methodology page for a detailed breakdown of every formula, data source, and limitation.
Use our free TDEE calculator to find out how many calories your body burns each day.
We built TDEE Cal Hub to be the calculator we wished existed — no paywalls, no email signups, just accurate results. Here's what people say after using it.
"I've tried half a dozen TDEE calculators and this is the only one that explains what the numbers actually mean. The fat loss and muscle gain targets showing up side by side made everything click for me. Down 8 kg in 3 months following the deficit target."
"As a personal trainer I recommend this to all my clients who want to understand their numbers before we start. The methodology page is a rare find — most tools hide their formulas. My clients trust it because they can see exactly how it works."
"Finally a calculator that updates as I type. I used to dread recalculating every time I changed an activity level — now I just adjust the slider and my targets update instantly. The macro breakdown after figuring out my TDEE was the missing piece I needed."