Introducing
The calorie science that gets smarter the longer you use it.
Most calorie calculators give you a formula estimate and leave you to figure out the rest. TrueTDEE™ is different. It learns your real metabolism from your actual data — getting more accurate every week.
The problem
The Mifflin-St Jeor formula is based on population averages. Your metabolism may be meaningfully higher or lower than the formula predicts.
Two people with identical stats can have very different real calorie burns based on NEAT, gut efficiency, hormones, and dozens of other factors.
As your weight changes, your calorie needs change. A target that worked at your starting weight stops working weeks later.
The method
We calculate your starting target using the Mifflin-St Jeor formula with our dual-input activity system.
Each day you log gives TrueTDEE™ more data to work with.
Using a weighted rolling average across all your logged weeks, TrueTDEE™ calculates what your body actually burns — not what a formula predicts.
Each weekly check-in recalibrates your calorie target based on your real metabolism, not a static estimate.
Confidence over time
In your first week, TrueTDEE™ starts with the formula — because that's all it has. As you log weight and calories each week, it accumulates real evidence about how your body responds. By week eight, your target is no longer a guess. It's a measurement.
Week 1
Formula estimate
~25% data confidence
Week 4
Blended
~60% data confidence
Week 8+
Your real metabolism
~100% data confidence
Get started
Start with the free quiz. Your first calorie target is calculated instantly. Upgrade to unlock TrueTDEE™ and watch your targets get more accurate every week.