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1rm.dev

Calculator

1RM tools, VO2max field tests, scoring, and session math.

Estimate

Estimate a 1RM
Weight + reps → estimated one-rep max.
Estimate a load
1RM + reps → predicted weight on the bar.
Rep-max table
One 1RM → 2RM through 12RM.
Compare formulas
The same set through all five 1RM formulas.
Powerlifting total
Squat + bench + deadlift.
Load–velocity 1RM
Linear intercept from load and velocity pairs.

Aerobic

Estimate VO2max
Cooper, Rockport, or Léger shuttle → estimated VO2max.

Tests

YMCA bench press
Fixed load, 60 bpm. Score is completed reps.

Score

Points
IPF GL, DOTS, Wilks, Sinclair, ratio, and allometric.
RPE to % 1RM
Helms / Zourdos conversion chart.

Session

Work sets
1RM × percent → today’s sets.
Warm-up
Empty bar up to the work set.
Plate loading
Bar plus plates for a target weight.
Attempts
Opener, second, and third from a planned 1RM.