Strength Training Guide
Same weight, different day, different set.
RPE lets your training follow how strong you actually are today, not how strong a spreadsheet said you would be.
RPE means rate of perceived exertion. In lifting, it is a 1 to 10 score for how hard a set was, based on how many more reps you could have done: RPE 10 means you had nothing left, RPE 9 means one more rep, RPE 8 means two more. Outside the weight room the term means other things too: in cardio and exercise testing, "RPE" usually refers to the Borg scale, which runs from 6 to 20, or a 0 to 10 version of it, and is about how hard your whole body is working rather than reps left.
This guide covers the lifting version only. You will get the RPE scale with reps in reserve, an RPE chart that converts reps and RPE into a percentage of your max, worked examples in pounds and kilograms, what the research says about how good people are at judging effort, and the situations where you are better off ignoring RPE altogether.
What Does RPE Mean in Lifting?
Rate of perceived exertion started as a cardio tool. The Swedish psychologist Gunnar Borg built the original scale so people could put a number on effort during work and exercise, and later added a 0 to 10 "category ratio" version (Borg, Medicine and Science in Sports and Exercise, 1982). Those scales ask how hard something feels. That works for a run, but it is vague for a set of squats, where "very hard" can mean one rep left or five.
Powerlifting coach Mike Tuchscherer of Reactive Training Systems made it concrete for lifting by tying each number to reps left in the tank. Researchers later tested that version and called it the RIR-based RPE scale: RPE 10 equals 0 reps in reserve, RPE 9 equals 1, and so on (Zourdos et al., Journal of Strength and Conditioning Research, 2016; Helms et al., Strength and Conditioning Journal, 2016). When a lifter, coach or program says "RPE 8," that is almost always what they mean.
The RPE Scale
Here is the RPE scale for lifting. Rate the set the moment you rack the bar, while you still know how the last rep moved.
| RPE | Reps in reserve (RIR) | What it feels like |
|---|---|---|
| 10 | 0 | Maximal effort. No more reps, no more weight. |
| 9.5 | 0 to 1 | No more reps, but you could have added a little weight. Or maybe one more rep. |
| 9 | 1 | Definitely one more rep, not two. |
| 8.5 | 1 to 2 | One more for sure, maybe two. |
| 8 | 2 | Two more reps. Hard, but the bar never stalled. |
| 7.5 | 2 to 3 | Two more for sure, maybe three. |
| 7 | 3 | Three more reps. Bar speed is still fast. |
| 6.5 | 3 to 4 | Moderate effort. Good for technique work. |
| 6 | 4 | Comfortable. Feels like a heavy warm-up. |
| 5 and below | 5 or more | Warm-ups and light work. Not usually rated. |
The half points earn their place near the top. RPE 9.5 is for the set where you know you had no rep left but could have squeezed on 2.5 kg or 5 lb, or where you are honestly unsure whether one more would have gone. Below RPE 6 the numbers stop being useful, because almost nobody can tell five reps in reserve from seven.
RPE vs RIR: Same Idea, Two Numbers
RIR means reps in reserve, the number of reps you could still have done with good form. On the lifting scale, RPE and RIR are two ways of writing the same thing: RIR = 10 minus RPE. RPE 8 is 2 RIR. RPE 7 is 3 RIR.
Which one you use is mostly habit. Powerlifting programs tend to write RPE, because it matches the RPE chart below and works neatly with singles and heavy triples. Muscle-building programs often write RIR, as in "stop 1 to 3 reps short of failure." That is the language our full body workout routine uses, and our guide to building muscle vs getting stronger puts most working sets at 0 to 3 RIR, which is roughly RPE 7 to 10. If a program says one and you think in the other, just subtract from 10.
Why Lifters Use RPE
Your strength is not the same every day. Bad sleep, a stressful week, a cold or a hard leg session two days ago can make your normal 5-rep weight feel like a max. On a great day it flies up. A percentage-based plan ignores that and hands you the same number either way. RPE adjusts it for you. This is called autoregulation: the target is an effort level, and the weight is whatever produces that effort today.
It also works over longer time spans. A fixed percentage of a max you tested eight weeks ago gets easier as you get stronger, so you end up undertrained. A set at RPE 8 stays an RPE 8 set, and the weight climbs with you.
Does it actually produce better results? One 8-week study had trained men squat and bench three times a week with matched sets and reps. One group got loads from percentages of their max, the other picked loads to hit target RPEs. Both groups gained strength and muscle with no statistically significant difference between them, though the RPE group's average strength gains were slightly larger (squat about +17 kg vs +14 kg) and the authors concluded RPE loading "may provide a small 1RM strength advantage in a majority of individuals" (Helms et al., Frontiers in Physiology, 2018). The study had 21 people. Read it as: RPE works at least as well as percentages, and lets you train well on days a percentage plan would get wrong.
RPE Chart: Reps and RPE to Percent of 1RM
The RPE chart connects effort to load. Find the number of reps on the left and the RPE across the top, and the cell gives the weight as a percentage of your one-rep max (1RM). For example, 5 reps at RPE 8 is about 81% of your max.
RPE Chart: % of 1RM
gymgod.app
| Reps | RPE 10 | 9.5 | 9 | 8.5 | 8 | 7.5 | 7 | 6.5 |
|---|---|---|---|---|---|---|---|---|
| 1 | 100.0% | 97.8% | 95.5% | 93.8% | 92.2% | 90.7% | 89.2% | 87.8% |
| 2 | 95.5% | 93.8% | 92.2% | 90.7% | 89.2% | 87.8% | 86.3% | 85.0% |
| 3 | 92.2% | 90.7% | 89.2% | 87.8% | 86.3% | 85.0% | 83.7% | 82.4% |
| 4 | 89.2% | 87.8% | 86.3% | 85.0% | 83.7% | 82.4% | 81.1% | 79.8% |
| 5 | 86.3% | 85.0% | 83.7% | 82.4% | 81.1% | 79.8% | 78.6% | 77.4% |
| 6 | 83.7% | 82.4% | 81.1% | 79.8% | 78.6% | 77.4% | 76.2% | 75.1% |
| 7 | 81.1% | 79.8% | 78.6% | 77.4% | 76.2% | 75.1% | 73.9% | 72.3% |
| 8 | 78.6% | 77.4% | 76.2% | 75.1% | 73.9% | 72.3% | 70.7% | 69.3% |
| 9 | 76.2% | 75.1% | 73.9% | 72.3% | 70.7% | 69.3% | 68.0% | 66.7% |
| 10 | 73.9% | 72.3% | 70.7% | 69.3% | 68.0% | 66.7% | 65.3% | – |
Skip the math. Enter any set you have done (weight, reps and RPE) into the free RPE calculator and it gives you the weight for any other reps and RPE, plus this chart filled in with your own numbers.
Want your estimated max with a full percentage table instead? Use the one rep max calculator.
Where the numbers come from: this is the widely used RPE chart commonly attributed to Mike Tuchscherer's The Reactive Training Manual (Reactive Training Systems, 2008), and it is the same table our RPE calculator uses, so the two always agree. Notice the pattern. Every step down in RPE is one more rep in reserve, so it lands on the same percentage as one more rep at RPE 10. 3 reps at RPE 8 (86.3%) equals 5 reps at RPE 10, because both describe a weight you could lift 5 times at most.
Treat every cell as an estimate. Rep-to-percentage relationships vary between people and between exercises: some lifters can do far more reps at 80% than others. The chart is mostly used for the squat, bench press and deadlift and is most trustworthy in the 1 to 6 rep range, where RPE itself is easiest to judge. Use it to pick a starting weight, then let the real RPE of your set have the final say.
How to Use RPE to Pick Your Working Weight
The most common RPE setup is a top set followed by back-off sets. You work up to one heavy set at a target RPE, then drop the weight for a few more sets at a slightly lower RPE. The top set tells you how strong you are today; the back-off sets add volume without grinding.
Say your program reads: squat, 1 x 5 @ RPE 8, then 3 x 5 @ RPE 7.
In pounds
- Warm up and work up. You hit 225 lb for 5 and rate it RPE 8: two clean reps left.
- The chart says 5 @ RPE 8 is 81.1% of your max, so today's estimated max is about 225 / 0.811 = 277 lb.
- 5 @ RPE 7 is 78.6%: 277 x 0.786 is about 218, so do your back-off sets at 215 lb.
In kilograms
- You work up to 100 kg for 5 at RPE 8.
- 100 / 0.811 gives an estimated max of about 123 kg today.
- At 78.6%, that is about 97 kg, so the back-off sets go at 97.5 kg.
Now the bad day. Same plan, but 225 lb for 5 feels like RPE 9. Do not force another rep or pretend it was an 8. The chart puts 5 @ RPE 9 at 83.7%, so today's estimated max is about 269 lb, and your back-off sets at RPE 7 come out around 211 lb, call it 210. In kilograms, 100 kg x 5 at RPE 9 means back-offs around 95 kg. You still get a full, productive session, just at the load your body can handle that day. On a great day it works the other way: if your warm-up at 215 moves like a 6, take the top set to 230 or 235 and let the back-offs follow.
If you have never rated sets before, there is a simpler way to start: pick a weight you think you could lift for 7 reps, do 5, and call it RPE 8. Then check how it felt and adjust next time.
How to Use RPE to Progress
RPE fits neatly into progressive overload. You are getting stronger when the same weight feels easier, or when more weight feels the same. RPE lets you see both.
- Add load when the RPE drops. Three weeks after the example above, 225 lb for 5 feels like RPE 7. Using 5 @ RPE 7 (78.6%), your estimated max is now about 286 lb, and 5 @ RPE 8 works out to about 232 lb. Next session, take the top set to 230 lb. In kilograms: 100 kg x 5 at RPE 7 points to about 103 kg for an RPE 8 set of 5, so try 102.5 kg.
- Watch the weight at a fixed RPE. Write down your top set and its RPE every time. If your 5 @ RPE 8 goes from 225 to 245 lb over two months, that is progress, even if you never test a max.
- Hold the weight when RPE climbs. If a weight that was RPE 7 last week is RPE 8.5 today, repeat it before adding more. One bad day is noise. Two or three weeks of rising RPE at the same loads is a pattern, and it is one of the signs our deload week guide tells you to look for.
- Raise the target over a training block. Many programs start a block at RPE 7 and finish at RPE 9, so the effort climbs as the block goes on. Keep RPE 10 for rare tests.
All of this depends on records. "It felt hard" means nothing three weeks later; "225 x 5 @ 8" does. Our guide to using a weight training journal shows how to log RPE next to weight and reps, set by set.
How Accurate Is RPE?
Not perfectly, but better than you might fear, and the research points to clear patterns.
People tend to underestimate what is left. A 2022 meta-analysis pooled 12 studies with 414 participants who predicted how many reps they had left and then kept going to failure. On average, they underpredicted by about 1 rep, meaning they had roughly one more rep in them than they thought, though results varied a lot between studies (Halperin et al., Sports Medicine, 2022). In practice, your RPE 8 may really be closer to an RPE 7.
Accuracy improves close to failure. In a study of 81 adults doing 10-rep sets on the chest press and leg press, estimates were off by about 1 rep when people were 0 to 5 reps from failure, and by more than 2 reps when they were 7 to 10 reps away (Hackett et al., Journal of Strength and Conditioning Research, 2017). The meta-analysis found the same thing, plus better accuracy with heavier loads, in later sets, and in sets of 12 reps or fewer compared with longer sets.
Experience helps less than you would think. Neither the Hackett study nor the meta-analysis found that training experience made people more accurate at counting reps left. Experience does seem to matter at the very top end: in the Zourdos study, experienced squatters rated their true 1RM attempt higher on the RPE scale than novices did, which suggests beginners do not always recognize a real max when they hit one. The practical takeaway: years under the bar will not calibrate you on their own. Rating sets on purpose, especially heavy ones, and occasionally checking yourself is the more reliable route.
One easy way to check yourself: now and then, on a safe exercise like a machine press or a leg press, rate the set, then keep going to failure and count. If you said RPE 8 and got four more reps, recalibrate.
When Not to Use RPE
- You are a true beginner. In your first months, almost every weight is new, and you have little idea what failure feels like, so "two reps left" is a guess. Beginners also make progress almost every session anyway. Run a simple plan with set reps and add weight when you hit them, like our full body routine, and start rating your top sets on the side as practice. Use RPE for real once your progress slows and your ratings feel consistent.
- High-rep sets. On a set of 15 or 20, burning muscles and heavy breathing make it hard to tell 2 reps left from 6. That is exactly where the studies above found the biggest errors. For high-rep accessory work, a rep target plus "stop a rep or two short of failure" is usually enough.
- Your ego writes the number. RPE only works if it is honest. If you always call your sets an 8 so you can add weight, or call a grinder a 7 because you want to look strong, the system breaks. The same goes the other way: some lifters sandbag and never push past RPE 7.
- Technique is changing. If you are relearning a lift, effort ratings swing as your form improves. Use fixed weights until the movement settles.
- Very fatiguing lifts and sloppy form. "Reps in reserve" means reps with good form. If your deadlift back starts rounding on rep 4, the set was over at rep 3, whatever your muscles say.
RPE Cheat Sheet
The RPE scale on one screen
- RPE 10 = 0 reps left. Tests and rare final sets only.
- RPE 9 = 1 rep left. Heavy top sets and peaking.
- RPE 8 = 2 reps left. The default for main-lift top sets.
- RPE 7 = 3 reps left. Back-off sets, volume and speed work.
- RPE 6 and below = 4 or more left. Warm-ups, technique, deload weeks.
- RIR = 10 minus RPE.
- Most working sets: RPE 7 to 9.
- Most accurate: heavy sets of 1 to 6 reps, rated right after the set.
- Add weight when last week's RPE 8 now feels like a 7.
- Hold or deload when RPE keeps climbing at the same weights.
Make Your RPE Calls Count
An RPE rating only means something next to last week's numbers. GymGod puts your last weights, reps and goals on screen the moment you start an exercise, so you walk up to the bar knowing what 225 x 5 felt like last time. Its auto-progression calculates your next target from what you actually lifted, with recalibration prompts when you need them, and an honest RPE call on your top set tells you whether to take that jump today or hold for a week.
Frequently Asked Questions
What does RPE mean?
RPE stands for rate of perceived exertion. In lifting, it rates how hard a set was on a 1 to 10 scale based on how many more reps you could have done: RPE 10 means none, RPE 9 means one, RPE 8 means two.
What is a good RPE to train at?
Most working sets belong at RPE 7 to 9, leaving 1 to 3 reps in reserve. That is hard enough to drive progress while leaving room for good form and recovery. Save RPE 10 for occasional tests.
What is the difference between RPE and RIR?
RIR is reps in reserve, the number of reps you had left. On the lifting RPE scale they describe the same thing: RIR equals 10 minus RPE, so RPE 8 is 2 RIR.
How do I use an RPE chart?
Find your reps on the left and your RPE across the top to get a percentage of your one-rep max. Divide a set's weight by that percentage to estimate your max, then multiply by the percentage of the set you want. For example, 225 lb for 5 at RPE 8 (81.1%) suggests a max near 277 lb.
Is RPE accurate?
Reasonably, on heavy sets close to failure. Research shows people usually underestimate how many reps they have left by about one, and errors grow on long, high-rep sets far from failure. Taking a safe set to failure now and then shows you how far off your own estimates are.
Should beginners use RPE?
Not as the main way to choose weights. Beginners progress fast on simple fixed-rep plans and are still learning what failure feels like. Rate your top sets for practice, then lean on RPE once progress slows.
