Perceived Effort in Running: The 0 to 10 Scale
What perceived effort is, the 0 to 10 scale with the talk test at each level and how to gauge intensity without a watch, with a calibration session.
In this article
Perceived effort is how hard running feels, scored from 0 to 10: 0 is the effort of sitting down and 10 is the maximum you can give. An easy run is done at 3 to 4, and a hard effort is around 7. To know which level you are at without looking at any device, the talk test works.
This article explains the full scale, what you can say at each level, five signals to gauge intensity without a watch and a 28-minute session to calibrate your own scale against your real pace. It is a guidance tool: it does not replace numbers, but it lets you train well when the numbers fail you.
What perceived effort is and why use it
Perceived effort is a subjective measure. It does not tell you what pace you are running, but how hard it feels to run at that pace. That is an advantage: the same pace does not cost the same on a hot day as on a cool one, or when you arrive tired as when you arrive fresh, but the effort you feel does reflect that difference.
The 0 to 10 scale used in running resembles the CR10 scale developed by the researcher Gunnar Borg around 1982. For their part, the CDC in the United States use a 0 to 10 scale where 0 is the effort of sitting and 10 is maximum effort, and they place moderate intensity at 5 or 6 and vigorous intensity from 7 or 8.
The 0 to 10 scale applied to running
This table summarizes the levels with what you can say at each one. It is a guidance reference of our own design, not an exact measure.
| Level | How it feels | What you can say | What it is for |
|---|---|---|---|
| 1 to 2 | Very light, you barely notice the effort | You talk normally | Walking, very slow jog, warm-up |
| 3 to 4 | Easy, you breathe with ease | Full sentences without stopping | Easy runs and long runs |
| 5 to 6 | Moderate, you notice you are working | Short sentences; you can talk but no longer sing | Transition segments |
| 7 | Hard, you breathe heavily | Single words, but you control your pace | Hard segments of a fartlek |
| 8 to 9 | Very hard, difficult to sustain | You can barely talk | Very short efforts |
| 10 | Maximum, you cannot give more | Nothing | Only a few seconds |
The talk test
The talk test is the quickest way to know which level you are at. The CDC describe it like this: at a moderate intensity you can talk, but not sing; at a vigorous intensity you cannot say more than a few words without pausing for breath.
For running, the practical version is this:
- If you can speak in full sentences, you are in the easy range, between 3 and 4.
- If you can only get out short sentences, you are at a moderate level, around 5 or 6.
- If you can only say single words, you are at a hard level, from 7 upward.
A simple way to check: say a sentence of about ten words out loud. If you struggle to finish it without stopping, slow down. It is a common guideline among coaches, not an exact measure. How to apply it to your easy pace is explained in what pace to run your easy runs at.
Five signals to gauge intensity without a watch
- Speech: the one we have just seen.
- Breathing: can you breathe steadily, or do you need to breathe harder and harder? Breathing through your nose is an additional clue, not a rule.
- Reserve: ask yourself how many more minutes you could hold this effort. If you would say 10 or fewer, you are probably above a 7 (guidance reference).
- Stride: at low effort your stride is relaxed; when it goes up, you have to concentrate to keep your form.
- Head: if you are counting the minutes that remain, you are probably running above what was planned.
No single signal is conclusive. Combine two or three and go with the level most of them point to.
Calibrate your scale: a 28-minute session
To link how it feels with your real pace, do this session once, on a flat route or on a treadmill:
- 10 minutes of easy warm-up, like the one in warm-up before running.
- 3 minutes at effort 3 or 4 (full sentences).
- 2 minutes of very easy jogging.
- 3 minutes at effort 5 or 6 (short sentences).
- 2 minutes of very easy jogging.
- 3 minutes at effort 7 (single words).
- 5 minutes of cool-down.
Count: 10 + 3 + 2 + 3 + 2 + 3 + 5 = 28 minutes. When you finish, write down your average pace for each segment. The numbers are what you use to build your own table.
An illustrative example, not real data: if the three segments come out at 7:40, 7:00 and 6:25 per kilometer, between the easy effort and the hard one there are 75 seconds per kilometer. Your table will be different; what matters is that it works as a reference for you.
Effort and pace do not always match
Effort takes priority over pace when conditions change. If your easy effort comes out at 7:40 per kilometer on a cool day, on a hot day it can come out at 8:05, which is 25 seconds per kilometer slower, and that is fine: what you hold is the effort, not the number. The same happens if you arrive tired from a hard session.
How to use it in your sessions
- Easy runs and long runs: effort 3 or 4. Their length and progression are in long run: how long, how fast and how to progress.
- Fartlek: easy segments at 3 or 4 and hard segments at 7, as explained in fartlek for beginners.
- Warm-up: low effort, between 2 and 3 out of 10.
- Race: the first kilometers should feel easier than what you will end up feeling. A guidance reference of our own design for a 10K: about 6 at the start, around 7 in the middle and 8 at the end. If you are at an 8 from the first kilometer, you have started too fast.
When you have a recent result, you can cross-check the feeling against the paces given by the training zones page.
Common mistakes
- Scoring your effort by the pace you think you should be running.
- Changing the scale from one day to the next without looking at the signals.
- Running all your easy runs at a 5 or 6 thinking it is easy.
- Trusting only the number on the watch when your body is telling you something else.
- Not repeating the calibration session when your fitness changes.