A Runarix Application

1RMX

Strength calculations made simple. One focused toolkit for lifters who want useful numbers without unnecessary clutter.

Coming soon

Strength Toolkit

Everything you need to calculate the next number.

1RMX brings core strength calculations and training tools together in a clean, straightforward interface.

1RMX

CALCULATOR HISTORY TOOLS

Exercise

Bench Press

Weight

275 LB

Reps

Estimated 1RM 315 LB

Core Tools

Estimate one-rep maxes using multiple established formulas or a combined consensus result.

Calculate percentages and training-max targets in pounds or kilograms.

Determine plate loading using configurable bars and available plate inventory.

Build progressive warm-up sets from a target working weight.

Use numeric RIR and RPE tools to support training decisions.

Save lifts, identify PRs and review strength history over time.