Rating of Perceived Exertion: a 1-to-10 scale describing how hard a set felt. RPE 10 means no reps in reserve; RPE 8 means two reps left in the tank. It lets you set today’s load by how today actually feels.

What is RIR and how does it relate to RPE?

Reps in Reserve is the inverse of RPE. RPE 10 = 0 RIR. RPE 9 = 1 RIR. RPE 8 = 2 RIR. Many coaches prefer RIR because the wording is more concrete: "how many more reps could you have done?"

How accurate is the RPE-to-%1RM chart?

It is a practitioner’s chart, not a lab measurement, but close enough to program from for trained lifters on the squat, bench, and deadlift. It is less reliable for novices, who tend to underrate how hard a set was, and for high-rep accessory work.

Should I program in RPE or in percentages?

RPE adapts to how you feel that day, which is useful when life stress, sleep, or fatigue change. Percentages are easier to plan and execute. Most modern programs use a hybrid: prescribed percentages capped by an RPE target.

What RPE should I train at?

For hypertrophy work: RPE 7–9. For strength: RPE 8–9. For peaking singles: RPE 9–10. Sustained RPE 10 work has the highest injury and burnout risk and should be used sparingly.

Why does the same RPE feel different on different days?

Daily readiness fluctuates with sleep, food, stress, and accumulated fatigue. The whole point of RPE-based training is to adjust load to match how you actually feel rather than forcing a fixed weight.

RPE to %1RM Calculator

Free RPE calculator and chart. Convert between RPE, reps in reserve, and percent of 1RM using the Reactive Training Systems table for autoregulated training.

RPE, or Rating of Perceived Exertion, is a 1-to-10 scale that describes how hard a set felt. An RPE 8 set means "two reps in reserve": you could have done two more with good form. RPE 10 means "no reps in reserve": that last rep was a grind. The point of rating it is that a percentage program can't tell the difference between a good day and a bad one, and you can.

The chart on this page maps RPE and rep count to a percentage of your one-rep max. It comes from Mike Tuchscherer's Reactive Training Systems table, the one most of powerlifting has settled on. Plug in your 1RM, your target RPE, and your rep count, and you get the working weight that should land you there. It's the same chart MuscleBuddy reads when you log RPE and it moves your load.

Your 1RM

UnitsTarget RPEReps

Percent of 1RM81.1%

Weight for 5 reps @ RPE 8122.5 kg

Full RPE-to-%1RM chart

RPE	1r	2r	3r	4r	5r	6r	7r	8r	9r	10r
10	100.0	95.5	92.2	89.2	86.3	83.7	81.1	78.6	76.2	73.9
9.5	97.8	93.9	90.7	87.8	84.9	82.4	79.9	77.4	75.1	72.3
9	95.5	92.2	89.2	86.3	83.7	81.1	78.6	76.2	73.9	70.7
8.5	93.9	90.7	87.8	84.9	82.4	79.9	77.4	75.1	72.3	69.4
8	92.2	89.2	86.3	83.7	81.1	78.6	76.2	73.9	70.7	68.0
7.5	90.7	87.8	84.9	82.4	79.9	77.4	75.1	72.3	69.4	66.7
7	89.2	86.3	83.7	81.1	78.6	76.2	73.9	70.7	68.0	65.3

How this works

The idea underneath the chart is simple: heavier weights move slower and feel harder, so at a fixed rep count, how hard a set felt tracks how close the load was to your max. Mike Tuchscherer of Reactive Training Systems built the table that most powerlifting programming now runs on.

Each row of the chart corresponds to a target RPE. Each column to a rep count. The cell value is the percentage of your 1RM that should produce that combination. For example, RPE 8 × 5 reps = 81% of 1RM. So if your bench 1RM is 100 kg, a set of 5 at RPE 8 should be around 81 kg.

Why RPE works: it accounts for daily readiness. Sleep, stress, nutrition, and accumulated fatigue all shift how heavy a given weight feels. A percentage-based program forces you to lift a fixed weight regardless of these factors: sometimes too easy, sometimes too hard. An RPE-targeted program lets you scale up on good days and back off on bad days while still hitting the same training stimulus.

How to use the chart in practice: if your program prescribes "5 × 5 at RPE 8," look up the percentage (81%), multiply by your current estimated 1RM, and round to the nearest plate-friendly weight. After the set, rate the actual RPE. If it landed at RPE 8 → great. If it was RPE 9, drop weight by 2.5–5% next session. If it was RPE 7, add the same.

Limits of the chart: it was built for trained lifters doing 1–10 reps on compound lifts. It holds up worse on high-rep accessory work, where endurance takes over, and worse again for newer lifters, who tend to underrate a set because they have not yet met a real grind. If you're new, the chart will hand you a weight that's too heavy at high RPE. Start under it and work up over a few weeks.

Frequently asked questions

What is RPE?: Rating of Perceived Exertion: a 1-to-10 scale describing how hard a set felt. RPE 10 means no reps in reserve; RPE 8 means two reps left in the tank. It lets you set today’s load by how today actually feels.
What is RIR and how does it relate to RPE?: Reps in Reserve is the inverse of RPE. RPE 10 = 0 RIR. RPE 9 = 1 RIR. RPE 8 = 2 RIR. Many coaches prefer RIR because the wording is more concrete: "how many more reps could you have done?"
How accurate is the RPE-to-%1RM chart?: It is a practitioner’s chart, not a lab measurement, but close enough to program from for trained lifters on the squat, bench, and deadlift. It is less reliable for novices, who tend to underrate how hard a set was, and for high-rep accessory work.
Should I program in RPE or in percentages?: RPE adapts to how you feel that day, which is useful when life stress, sleep, or fatigue change. Percentages are easier to plan and execute. Most modern programs use a hybrid: prescribed percentages capped by an RPE target.
What RPE should I train at?: For hypertrophy work: RPE 7–9. For strength: RPE 8–9. For peaking singles: RPE 9–10. Sustained RPE 10 work has the highest injury and burnout risk and should be used sparingly.
Why does the same RPE feel different on different days?: Daily readiness fluctuates with sleep, food, stress, and accumulated fatigue. The whole point of RPE-based training is to adjust load to match how you actually feel rather than forcing a fixed weight.

Related tools

Embed this calculator on your site

Free to use: paste this snippet into any page. It drops in a live, responsive rpe to %1rm calculator with a small attribution link back to MuscleBuddy.

Embed code

<div style="max-width:480px;margin:0 auto">
  <iframe
    src="https://musclebuddy.net/embed/calculators/rpe"
    title="RPE to %1RM Calculator by MuscleBuddy"
    width="100%"
    height="680"
    style="border:0;width:100%;border-radius:16px"
    loading="lazy"
  ></iframe>
  <p style="font:400 13px/1.5 system-ui,-apple-system,sans-serif;text-align:center;margin:8px 0 0">
    Powered by <a href="https://musclebuddy.net/calculators/rpe?ref=embed&utm_source=embed&utm_medium=iframe&utm_campaign=calculator_widget" target="_blank" rel="noopener">MuscleBuddy</a>
  </p>
</div>

Track your progress automatically with MuscleBuddy

Log workouts and weigh-ins once, and let MuscleBuddy adjust your weights and macros for you.

Create your free account