Skip to main content
Protocolv0.20.1 BETA
Start Free

Training tool

RPE load calculator

Estimate a load for a target rep and RPE prescription. The output is a planning reference, not proof that the set will feel exactly right.

Best for

For lifters using RPE or reps-in-reserve targets who want a starting load before adjusting in the session.

Estimate a starting load

RPE becomes RIR, then the load is backed out from e1RM.

This calculator rounds to common loading jumps. Use the result as the first attempt, then adjust from the bar.

Estimated result

Enter e1RM, reps, and RPE.

The output will show a rounded starting load and the RIR adjustment behind it.

Estimate only

RPE to RIR, then load

This calculator maps RPE to reps in reserve: RPE 10 means 0 reps left, RPE 9 means about 1 rep left, and so on.

It adds those reserve reps to your target reps, then uses the Epley relationship to estimate the load from your e1RM.

Use the number as a first attempt. Bar speed, fatigue, sleep, movement choice, and technique can all move the real session load.

Use the next calculator

Estimate the base maxRPE load planning starts with an e1RM that matches the movement you are training.Convert the output to platesRound the calculated load to what you can actually put on the bar.Use RPE with percentagesUse the guide when a percentage prescription does not match today's effort.Choose working weightUse the planned percentage and the day's effort to select a practical load.What RPE meansRead the broader effort-scale guide before treating RPE as exact math.

Formula and assumptions

  • Estimated total reps = target reps + estimated reps in reserve.
  • Load estimate = e1RM / (1 + estimated total reps / 30).
  • RPE is treated as a practical RIR anchor, not exact percentage math.

Use it well

  • Start with an e1RM that came from similar technique and range of motion.
  • Pick the target reps and RPE from your program.
  • Round the output to a load you can actually put on the bar.
  • Adjust in the session if the first warm-up or work set moves differently than expected.

Keep it honest

Caveats

  • RPE is useful, but it is not exact percentage math.
  • RIR estimates can be less reliable when sets are far from failure.
  • Use coach or program guidance when it conflicts with this planning estimate.

References

Sources

Common questions

FAQ

What does RPE mean in this calculator?

RPE is treated as an estimate of reps in reserve. RPE 10 means no reps left, RPE 9 means about one rep left, and RPE 8 means about two reps left.

Is the RPE load exact?

No. It is a starting point. Warm-up speed, fatigue, technique, and the lift itself can change the real session load.

Should I use e1RM or training max as the input?

Use the input your program expects. For day-to-day effort planning, use a recent estimate that matches the lift and technique you are training.