RPE Chart — Rate of Perceived Exertion

RPE (Rate of Perceived Exertion) is a subjective scale that measures how hard a set felt. In strength training the most common range is 7–10, where each number corresponds to the reps you had left in reserve (RIR) before failure.

Using RPE lets you autoregulate — adjusting load based on daily readiness instead of rigid percentages. On a strong day you lift heavier at the same RPE; on a rough day the weight drops automatically.

StrengthBase integrates RPE directly into its 1RM engine. When you log your RPE alongside weight and reps, the calculator adjusts the effective rep count to produce a more accurate max estimate.

Open StrengthBase Calculator

RPE / Reps-in-Reserve Table

RPE	RIR	Description
10	0	Maximum effort — no reps left
9.5	0–1	Maybe one more rep, maybe not
9	1	Could do one more rep
8.5	1–2	Definitely one more, maybe two
8	2	Could do two more reps
7.5	2–3	Two more for sure, possibly three
7	3+	Three or more reps left in the tank

How to Use

After each working set, rate how many reps you had left in the tank.
Map that feeling to the RPE scale above.
Enter the RPE into the StrengthBase calculator alongside your weight and reps for a more accurate 1RM estimate.

Frequently Asked Questions

What RPE should I train at?: Most strength programs keep the majority of working sets between RPE 7 and 9. Only competition or testing sessions should hit RPE 10 regularly.
How do I learn to rate RPE accurately?: Practice takes time. Start by asking yourself after each set: "Could I have done one more rep?" Over a few weeks your self-assessment will calibrate.
Is RPE better than percentage-based training?: Neither is strictly better. Percentages give structure; RPE adds flexibility. Many modern programs combine both — using percentages as a target and RPE as a daily cap.
Why does StrengthBase use RPE 7–10 only?: Below RPE 7 the set is too far from failure for the 1RM formulas to be meaningful. Keeping the range at 7–10 ensures reliable estimates.