Free 1RM calculator
1RM Calculator
Estimate a client's one-rep max from any hard rep set, then turn it into a 90% training max, percentage loads, and practical rep-max targets for programming.
Free · No sign-up · kg & lbs · Epley, Brzycki, and Lombardi
Free 1RM calculator
Estimate max strength from a rep set.
Reps are capped at 12 because 1RM estimates get less reliable as sets become conditioning tests.
Percentage table
Use these loads for warm-ups, back-off sets, and percentage work.
Rep-max equivalents
Convert the estimated 1RM back into practical target sets.
Use the estimate in a ratio check
Once you have a 1RM estimate, compare it against squat, bench, deadlift, press, pull, and bodyweight targets.
Open the strength ratio calculatorCoach workflow
From one hard set to useful programming numbers
A one-rep max estimate is most useful when it becomes a decision: how heavy to train, what target to chase, and whether the lift fits the client's broader strength profile.
Estimate max strength
Use a recent top set to estimate 1RM without forcing a true max attempt every block.
Set training loads
Use the percentage table for warm-ups, back-off sets, and strength work.
Check ratios
Feed the estimate into the strength ratio calculator to spot lagging movement patterns.
Next step
Use the 1RM estimate in a strength ratio check
Once you have estimated squat, bench, deadlift, press, row, or pull-up strength, Trainnode can compare those 1RMs against balanced lift-to-lift and bodyweight targets.
Example coaching flow
- 1Estimate bench press 1RM from a 5RM or 8RM set.
- 2Use 90% training max for the next block.
- 3Compare bench, squat, deadlift, press, and row ratios.
- 4Program the lift pattern that is genuinely lagging.
1RM calculator FAQ
- How does the 1RM calculator work?
- Enter the weight lifted and reps completed. Trainnode estimates the one-rep max with the selected formula, then shows a 90% training max, percentage table, and rep-max equivalents.
- Which 1RM formula should I use?
- Epley is the default because it is a practical coaching estimate for normal strength sets. Brzycki and Lombardi are included when you want to compare more conservative or curve-based estimates.
- Why are reps capped at 12?
- Estimated 1RM calculations become less reliable as sets get longer. Above 12 reps, fatigue, conditioning, and pacing affect the estimate more than maximal strength.
- Can I use this for squat, bench press, and deadlift?
- Yes. The calculator works for any weighted lift, including squat, bench press, deadlift, overhead press, rows, and weighted bodyweight lifts.
Questions about 1RM estimates?
Want to turn one-rep max estimates into better strength programming?
I’m a coach too — happy to show how Trainnode helps you use tested or estimated 1RMs for percentage work, strength targets, and lift-ratio decisions across a real client roster.
Prefer to explore first? See strength ratios in Trainnode.