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Rate Of Perceived Exertion Calculator

Work out rate of perceived exertion instantly with clear inputs, formula shown and shareable results.

About Rate Of Perceived Exertion Calculator

In resistance training the RPE scale maps directly onto reps in reserve: RPE 10 means nothing left, RPE 8 means two more were possible. Adding those reserve reps to the reps performed gives the set's equivalent maximum, which the Epley relation converts to a percentage of one-rep max. Five reps at RPE 8 with 100 kg implies a 1RM near 123 kg.

Formulas

Reps in reserve

RIR = 10 - RPE

Load as a share of 1RM

%1RM = 1 / (1 + (reps + RIR) / 30)

Worked example

With the default values below, Rate Of Perceived Exertion Calculator returns Reps In Reserve of 2.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

RPE on the 1-10 scaleaccepts 1–10
8
Reps completed in the setminimum 1
5
Weight on the barminimum 0 kg
100 kg

Results

Reps In Reserve
2.0
Implied One-Rep Max
123.3 kg
Load As Share Of One-Rep Max
81.1%
Reps You Could Have Managed
7.0

Step by step

  1. 1Values used
  2. 2Reps in reserve
  3. 3Load as a share of 1RM
  4. 4Reps In Reserve= 2.0
  5. 5Implied One-Rep Max= 123.3 kg
  6. 6Load As Share Of One-Rep Max= 81.1
  7. 7Reps You Could Have Managed= 7.0

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • This is an estimate from population-average equations, not a medical or diagnostic assessment. Individual results vary with genetics, training history and technique. Seek advice from a qualified coach or clinician before making significant changes to training.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

This is an estimate from population-average equations, not a medical or diagnostic assessment. Individual results vary with genetics, training history and technique. Seek advice from a qualified coach or clinician before making significant changes to training.

Frequently Asked Questions

Is RPE more useful than fixed percentages?

Often yes, because it adapts to how you feel that day. Fixed percentages ignore sleep, stress and accumulated fatigue.

How accurate are novice RPE ratings?

Poor at first - beginners typically underestimate how many reps they had left. Accuracy improves markedly after a few months of practice.

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