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RepLog Features
The Best One Rep Max (1RM) Calculator App
Calculate your 1RM accurately using RPE and Reps. Track your strength potential.
Testing your true 1RM is taxing and risky. RepLog uses advanced formulas (Epley, Brzycki, and RPE-based) to give you an accurate Estimated 1RM every single session.
Why RepLog is built for Strength Athletes?
Real-Time Updates
Your e1RM is calculated instantly after every set, showing you your daily potential.
Formula Variety
We use multiple formulas to give you the most accurate estimate possible.
Trend Lines
Don't just see a number; see a graph of your strength potential over months.
Powerful Features for Strength Athletes
Epley Formula Calculation
Brzycki Formula Calculation
RPE-based Estimation
Historic 1RM Graph
Percentage Breakdown Table
Attempt Selection Helper
Personal Record Alerts
Sinclair/Wilks Conversion
Expert Insight: Epley vs. Brzycki
Calculators aren't magic, but they are useful tools. **Which formula to use?** * **Epley:** Best for lower reps (1-5). Tends to overestimate high-rep sets. * **Brzycki:** More conservative, often better for higher reps (6-12). RepLog calculates both but defaults to a "Smart Average" that excludes outliers. Remember, a 1RM calculator assumes your form didn't break down. If the reps were sloppy, the max isn't real.
Frequently Asked Questions
How accurate is it?
Within ~5% for most trained lifters. Beginners vary more due to neurological efficiency.
Can I select my own formula?
Yes, in Settings > Analysis you can choose your preferred 1RM algorithm.
"Know your strength without testing it. Train smarter with accurate 1RM data that guides your programming percentages."
Track Your Progress
Put this knowledge into action with RepLog. The smartest workout log for serious lifters.
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