The 1-10 Scale Explained | Combat Fitness
RPE Meaning: What Rate of Perceived Exertion Is and How to Use It
The meaning of RPE is simple. RPE stands for rate of perceived exertion, a 1-10 score for how hard a set, run, or full session felt. It is one of the most practical autoregulation tools in strength and conditioning. It is also how our military fitness programs set intensity on days when a fixed percentage would be the wrong call.
The scale comes from Swedish psychologist Gunnar Borg’s exertion research in the 1970s. Sport scientists later tied it to reps in reserve so lifters could use it precisely. This guide covers the full scale, an RPE-by-number table, how RPE reads for lifting and for running, and how it maps to RIR. It also covers how tactical athletes use RPE to train around shift work, short sleep, and field time.
Key Takeaways:
RPE stands for rate of perceived exertion, a 1-10 rating of effort where 10 is maximal.
On the modern lifting scale, each number maps to reps in reserve. RPE 8 means you had about two reps left.
RPE lets your readiness on the day set the load. A short-sleep day and a fresh day get different weights for the same prescription.
Ratings get more accurate with practice and closer to failure, so calibrate them with occasional tested sets.
For tactical athletes, RPE keeps training productive through fatigue. You neither skip the session nor force it.
What Does RPE Mean?
RPE means rate of perceived exertion, a self-rating of how hard exercise feels at a given moment. In fitness, the acronym means the same thing in the weight room, on the track, and under a ruck. Most coaches use a 1-10 scale, where 1 is barely working and 10 is maximal effort.
A precise definition of RPE also explains why it works. Your rating combines signals that no single device measures at once: muscular strain, breathing rate, heart rate, bar speed, and accumulated fatigue (Borg, 1982). A barbell does not know you slept four hours. Your perception does.
Researchers still debate whether the scale measures “exertion” or “effort,” and that distinction matters in a lab (Halperin & Emanuel, 2020). In the gym, the working definition is enough. RPE is your honest answer to two questions: how hard was that, and how much did you have left?
The RPE Scale (1-10) and Its Borg Origin
The RPE scale began as Borg’s 6-20 scale, published in 1970. Borg designed it so that a rating multiplied by 10 roughly tracked heart rate during steady work in healthy adults (Borg, 1970; Borg, 1998). A 6 is rest and a 20 is maximal exertion. Clinical exercise testing still uses this version (ACSM, 2021).
Borg later introduced the Category-Ratio 10 scale (CR10). It is a 0-10 format with verbal anchors such as “moderate” and “very hard,” and it is easier to use mid-session (Borg, 1982). Coaches adopted the CR10 for whole-session ratings. Strength researchers then built a lifting-specific 1-10 scale anchored to reps in reserve (Zourdos et al., 2016; Helms et al., 2016).
Borg RPE (6-20): anchored to whole-body exertion, with a rough heart-rate link. Best for clinical testing and steady cardio.
Borg CR10 (0-10): anchored to verbal effort descriptors. Best for session RPE and conditioning.
RIR-based RPE (1-10): anchored to reps left before failure. Best for strength training.
The RPE chart in a training program almost always uses the 1-10 version. A prescription with an RPE range, such as “3 x 5 at RPE 7-8,” means every working set should land inside that window. Your first set should not already sit at the top of it.
RPE by Number: What RPE 5-10 Feels Like
On the lifting scale, each RPE number tells you how many more clean reps you could have completed. RPE 10 means zero reps left. RPE 9 means one, RPE 8 means two, and RPE 7 means three. Anything below 7 is deliberately submaximal and is used for speed, technique, or warm-ups.
RPE 10 (0 RIR): Maximal. No more reps, no more load. Use for testing and rare top singles.
RPE 9.5 (0 RIR): No more reps, but slightly more load was possible. Use for peak heavy sets.
RPE 9 (1 RIR): One clean rep left. Use for heavy top sets and short blocks.
RPE 8.5 (1-2 RIR): One rep left for sure, maybe two. Use in strength blocks.
RPE 8 (2 RIR): Two reps left, bar speed slowing. Use for main strength work.
RPE 7.5 (2-3 RIR): Two reps left, maybe three. Use for moderate-heavy volume.
RPE 7 (3 RIR): Bar moves fast with full control. Use for volume and technique under load.
RPE 6 (4 RIR): Quick and crisp, clearly submaximal. Use for speed work and the warm-up ramp.
RPE 5 (5 or more RIR): Light working effort. Use for warm-ups and recovery sessions.
RPE 1-4 (many RIR): Little to no strain. Use for mobility and active recovery.
RPE 6 and RPE 7
An RPE 6 set moves quickly, and you could have done four more reps. RPE 7 means three reps in reserve. That is the most productive range for building volume, because you accumulate quality work without paying a large fatigue cost. Most hypertrophy and work-capacity sets belong here.
RPE 8
RPE 8 means two reps left. The bar slows, but your positions hold. RPE 8 is the default target for main lifts during a strength block, because it is heavy enough to drive adaptation and leaves room to recover for the next session.
RPE 9 and RPE 10
RPE 9 means one rep left. RPE 10 means nothing left, which is a true max effort. Use both sparingly, since fatigue cost climbs steeply as you approach failure. A single at RPE 10 is your 1RM for that day.
Half Points Like RPE 7.5
Half points mean you are unsure between two RIR values. An RPE 7.5 says “two reps left, maybe three.” When in doubt, rate conservatively and round up, because underrating effort is the more common error.
RPE in the Gym vs. Running and Cardio
The meaning of RPE in weightlifting and powerlifting is set-specific and tied to reps in reserve. Powerlifting coaches popularized this version, and researchers then validated it (Zourdos et al., 2016). Rate the set right after the last rep, before you rack the bar and the effort fades from memory. To start using it, take a strength workout for athletes and assign an RPE target to each main lift.
Running and cycling have no reps in reserve, so the rating relies on breathing and how long you could sustain the pace. A common working guide for endurance RPE, consistent with the talk test used in exercise prescription (ACSM, 2021):
RPE 2-3: easy. You can hold a full conversation. Aerobic base work and recovery runs.
RPE 4-6: steady to comfortably hard. Short sentences only. Long runs and steady ruck movements.
RPE 7-8: threshold. A few words at a time. Tempo runs and hard ruck intervals.
RPE 9-10: maximal. No talking. Short intervals and test events.
For whole sessions, use session RPE. About 30 minutes after training, rate the entire session on the CR10 scale and multiply that rating by the session length in minutes. The result is a training-load number in arbitrary units (Foster et al., 2001). Session RPE has been validated across team and endurance sports (Impellizzeri et al., 2004; Haddad et al., 2017). It gives you one load metric for a ruck, a run, and a lift, which is exactly the mix a tactical athlete trains.
RPE vs. RIR (Reps in Reserve): What’s the Difference?
RIR counts how many reps you had left. RPE rates how hard the set felt. On the modern lifting scale they describe the same thing from two directions: RPE equals 10 minus RIR, so RPE 8 equals 2 RIR. RPE also works for cardio, where counting reps in reserve does not apply.
Accuracy is the practical difference between the two. Lifters tend to underestimate how many reps they have left when they are far from failure, and they get more accurate as sets approach failure (Hackett et al., 2017). Experienced lifters rate more accurately than novices, and accuracy improves across successive sets (Zourdos et al., 2016; Ormsbee et al., 2019).
That points to a simple rule. Prescribe RIR for newer lifters, because “leave two in the tank” is easier to execute than a number on a scale. Shift to RPE once your ratings line up with tested sets.
RPE and Your 1RM
A single at RPE 10 is your max for that day. A single at RPE 8 means you could have done roughly two more reps with that weight. That lets you track strength from heavy submaximal singles without frequent max testing. Coaches use rep-and-RPE charts to estimate a 1RM from these sets, and that figure should be treated as an estimate, not a tested max.
How to Use RPE to Program and Autoregulate Training
RPE training means the prescription fixes the effort and the day decides the load. Two studies support the approach. Autoregulated progression produced greater strength gains than linear periodization in college athletes (Mann et al., 2010). RPE-based loading matched percentage-based loading for strength, with small differences favoring RPE (Helms et al., 2018). To compare how full programs build this in, our guide to choosing a strength & endurance program covers what to look for.
How to use RPE, step by step:
Learn the scale on low-risk lifts. Practice rating goblet squats, rows, and presses before relying on it for heavy barbell work.
Write targets as sets, reps, and RPE. For example: 4 x 5 at RPE 7-8.
Ramp up, then select the load. Use warm-up sets to find a weight that lands on target. If the first working set reads RPE 9 instead of 8, drop the load before the next set.
Rate every working set, especially the last one. Last-set RPE shows how much fatigue built up. If it drifts a full point above target, stop the exercise or cut the load.
Log load and RPE together. The same weight at a lower RPE over several weeks means you are getting stronger.
Calibrate every few weeks. Run a rep-out on a safe lift and compare your predicted reps with what you completed.
Why RPE Matters for Tactical Athletes
Percentage-based programs assume you show up in the same condition every session. Tactical work breaks that assumption. Night shifts, 0400 wake-ups, field problems, and missed meals all change what your body can produce on a given day. Sleep loss impairs performance and can raise perceived effort for the same workload (Fullagar et al., 2015). The Army’s Holistic Health and Fitness doctrine treats sleep as a readiness domain alongside physical training for the same reason (Department of the Army, 2020).
RPE keeps the session on the calendar without forcing it. On a fresh day, RPE 8 might be 315 pounds. After a double shift, it might be 275. The stimulus stays the same because the effort stays the same, and you avoid digging a recovery hole. That decision process is the core of training when busy, under-slept & still expected to perform.
RPE also gives you data for harder calls. When your session RPE trends up across a week while your output stays flat, accumulated fatigue is the likely cause, and monitoring that trend is a recognized way to catch it early (Halson, 2014). Knowing when to train through fatigue vs. rest starts with an honest rating. Train hard when you are fresh, and pull back when you are worn down.
Common RPE Mistakes
A high RPE that you did not plan for is information, not failure. When the same weight starts to feel harder, your rating changes before your performance drops. The mistakes below cost athletes that early warning.
Rating your ego instead of the set. Calling a grinding rep an RPE 8 so the next jump feels justified wrecks the system.
Sandbagging. Rating everything RPE 6 to avoid hard work leaves adaptation on the table.
Chasing high RPE every session. Living at RPE 9 and 10 piles up fatigue faster than strength.
Ignoring rising RPE. If a familiar load rates higher two sessions in a row, reduce load or volume.
Rating the session from the last rep. Session RPE is a whole-session rating, given about 30 minutes after training (Foster et al., 2001).
Never calibrating. Without occasional rep-outs, your ratings drift.
Frequently Asked Questions
What does RPE stand for, and what does it mean in the gym?
RPE stands for rate of perceived exertion. In the gym, it is a 1-10 rating of how hard a set felt, usually tied to how many reps you had left. RPE 10 is maximal, and RPE 7 means about three reps in reserve. Coaches use it to prescribe intensity without fixed percentages.
What does RPE 7, 8, or 9 mean?
RPE 7 means you could have done about three more reps. RPE 8 means two more, and RPE 9 means one more. RPE 7 suits volume and technique work. RPE 8 is the standard target for heavy strength sets. RPE 9 is reserved for top sets and short peaking blocks.
What is the difference between RPE and RIR?
RIR counts the reps you had left, while RPE rates the effort. On the lifting scale they convert directly: RPE equals 10 minus RIR. RIR is easier for newer lifters to use. RPE adds half-point precision and also applies to running, rucking, and conditioning.
How do you use RPE to choose your weights?
Ramp up through warm-up sets until a weight feels like it will land at your target RPE, then run the working sets. If a set rates higher than prescribed, reduce the load. If it rates lower, add a little weight. Log both load and RPE so you can track progress over time.
Is the RPE scale 1-10 or the Borg 6-20 scale?
Both exist. Borg’s original 6-20 scale is still used in clinical exercise testing. Most strength and conditioning programs use a 1-10 scale, either Borg’s CR10 for whole sessions or the reps-in-reserve version for lifting. When a training program lists an RPE, assume it is the 1-10 scale.
How does RPE work for running vs. lifting?
For lifting, RPE reflects reps left in a set. For running, it reflects breathing and how long you could hold the pace. Easy runs sit around RPE 2-3 and allow full conversation. Threshold work sits at RPE 7-8. Maximal intervals reach RPE 9-10.
Understanding RPE means understanding a better way to train. Rate of perceived exertion turns your readiness on the day into the deciding factor, so a hard week does not derail your progress and a strong day does not go to waste. Learn the scale, rate every working set honestly, and calibrate it against tested sets. Then let a structured plan set the RPE targets, so every session moves you toward the standard you need to meet.
References:
Borg, G. (1970). Perceived exertion as an indicator of somatic stress. Scandinavian Journal of Rehabilitation Medicine, 2(2), 92-98.
Borg, G. A. (1982). Psychophysical bases of perceived exertion. Medicine and Science in Sports and Exercise, 14(5), 377-381.
Borg, G. (1998). Borg’s Perceived Exertion and Pain Scales. Champaign, IL: Human Kinetics.
American College of Sports Medicine. (2021). ACSM’s Guidelines for Exercise Testing and Prescription (11th ed.). Philadelphia: Wolters Kluwer.
Zourdos, M. C., Klemp, A., Dolan, C., et al. (2016). Novel resistance training-specific rating of perceived exertion scale measuring repetitions in reserve. Journal of Strength and Conditioning Research, 30(1), 267-275.
Helms, E. R., Cronin, J., Storey, A., & Zourdos, M. C. (2016). Application of the repetitions in reserve-based rating of perceived exertion scale for resistance training. Strength and Conditioning Journal, 38(4), 42-49.
Helms, E. R., Byrnes, R. K., Cooke, D. M., et al. (2018). RPE vs. percentage 1RM loading in periodized programs matched for sets and repetitions. Frontiers in Physiology, 9, 247.
Hackett, D. A., Cobley, S. P., Davies, T. B., Michael, S. W., & Halaki, M. (2017). Accuracy in estimating repetitions to failure during resistance exercise. Journal of Strength and Conditioning Research, 31(8), 2162-2168.
Ormsbee, M. J., Carzoli, J. P., Klemp, A., et al. (2019). Efficacy of the repetitions in reserve-based rating of perceived exertion for the bench press in experienced and novice benchers. Journal of Strength and Conditioning Research, 33(2), 337-345.
Mann, J. B., Thyfault, J. P., Ivey, P. A., & Sayers, S. P. (2010). The effect of autoregulatory progressive resistance exercise vs. linear periodization on strength improvement in college athletes. Journal of Strength and Conditioning Research, 24(7), 1718-1723.
Foster, C., Florhaug, J. A., Franklin, J., et al. (2001). A new approach to monitoring exercise training. Journal of Strength and Conditioning Research, 15(1), 109-115.
Impellizzeri, F. M., Rampinini, E., Coutts, A. J., Sassi, A., & Marcora, S. M. (2004). Use of RPE-based training load in soccer. Medicine and Science in Sports and Exercise, 36(6), 1042-1047.
Haddad, M., Stylianides, G., Djaoui, L., Dellal, A., & Chamari, K. (2017). Session-RPE method for training load monitoring: validity, ecological usefulness, and influencing factors. Frontiers in Neuroscience, 11, 612.
Halson, S. L. (2014). Monitoring training load to understand fatigue in athletes. Sports Medicine, 44(Suppl 2), S139-S147.
Fullagar, H. H., Skorski, S., Duffield, R., et al. (2015). Sleep and athletic performance: the effects of sleep loss on exercise performance, and physiological and cognitive responses to exercise. Sports Medicine, 45(2), 161-186.
Halperin, I., & Emanuel, A. (2020). Rating of perceived effort: methodological concerns and future directions. Sports Medicine, 50(4), 679-687.
Headquarters, Department of the Army. (2020). FM 7-22, Holistic Health and Fitness. Washington, DC.
Centers for Disease Control and Prevention. Perceived Exertion (Borg Rating of Perceived Exertion Scale).
Disclaimer: This article is for educational purposes only and is not medical advice. Consult a qualified healthcare provider before starting a new training program, especially if you have an injury, a medical condition, or are returning from time off. Training outcomes vary by individual, and no specific result is guaranteed.
