TrainerTrue was built on a single belief: every serious athlete and coach deserves access to the same precision tools used by professionals — without paying for an expensive app subscription.
We exist to bridge the gap between gym floor knowledge and laboratory-grade data. Our calculators use the same validated formulas trusted by the NSCA, military fitness programs, and elite sports organizations — available to anyone, completely free.
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Pro Tools
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Free Forever
NSCA
Validated
Why We Built This
Most fitness tools online are either too basic to be useful, or locked behind expensive subscriptions. TrainerTrue was created by people who know what it means to need real numbers to make real decisions — what weight to eat at, what protein intake preserves muscle during a cut, what percentage of 1RM to use for hypertrophy vs strength work.
Our Commitment to Accuracy
Every formula we use is sourced from published, peer-reviewed research. We use Mifflin-St Jeor (1990) for TDEE, Hodgdon & Beckett (1984) for body fat, Epley (1985), Brzycki (1993), and Lombardi for 1RM. We are transparent about limitations — calculators are tools, not oracles.
Who TrainerTrue Is For
Personal trainers and coaches who need reliable numbers to program for clients
Competitive athletes optimizing performance and body composition
Beginners who want to start with real data, not guesswork
Fitness enthusiasts serious about understanding their body
Ready to Get Your Numbers?
Start with the TDEE calculator — it's the foundation of everything else.