Free fitness tools
Practical calculators for better training decisions
Carbyne Lab tools are built for lifters and coaches who want useful estimates without opening a spreadsheet. Use them with your workout log, then read the linked guides before making large programming changes.
Strength Calculator
Estimate your one-rep max, training max, back-off loads, and percentage table from a recent set and RPE.
OpenTraining Guides
Pair the calculator with practical guides on progressive overload, warm-ups, RPE, and recovery.
OpenPersonal Training
Work with a coach when you want programming decisions reviewed against your goals and injury history.
Open