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Running Record Calculator
Turn your tally marks into accuracy rate, error rate and self-correction ratio, with the reading level band shown at once.
Good text for guided reading. Watch which cues the errors ignore.
Running record formulas
Accuracy is the share of running words read correctly. Error rate shows one error for every n words. The self-correction ratio shows one self-correction for every n miscues.
Accuracy % = (RW − E) ÷ RW × 100
Error rate = 1 : (RW ÷ E)
SC ratio = 1 : ((E + SC) ÷ SC)
RW is running words, E is errors, SC is self-corrections. Ratios are rounded to the nearest whole number.
Worked example
A first grader reads a 150-word levelled book. You record 9 errors and 3 self-corrections.
- Accuracy: (150 − 9) ÷ 150 × 100 = 94%
- Error rate: 150 ÷ 9 = 16.7, rounded to 1:17
- SC ratio: (9 + 3) ÷ 3 = 1:4
At 94% the book is at instructional level, a good fit for a guided reading group.
Accuracy levels
| Accuracy | Level | Use the text for |
|---|---|---|
| 95 to 100% | Independent (easy) | Reading alone, fluency practice |
| 90 to 94% | Instructional | Guided reading with teacher support |
| Below 90% | Frustration (hard) | Read-aloud only; drop a level |
How teachers use running records
- Placing students in groups. Find the highest level each child reads at 90 to 94%.
- Checking cue use. After scoring, sort each error by meaning, structure and visual cues to see what the reader relies on.
- Watching self-monitoring. A tightening SC ratio over a term is a strong sign of growth even when the level has not moved yet.
Pair this with the WCPM calculator when the child is ready for timed fluency work.
Frequently asked questions
How do you calculate accuracy on a running record?
Subtract the errors from the running words, divide by the running words, and multiply by 100. A child who reads 150 words with 9 errors has an accuracy rate of 94%.
How do you calculate the self-correction ratio?
Add the errors and self-corrections, then divide by the self-corrections. The result is written as 1:n. A ratio of 1:4 means the child corrected one of every four miscues.
What is a good self-correction ratio?
Many teachers read 1:3 to 1:5 as a sign that the child is monitoring meaning and print. A ratio wider than 1:6 can suggest the reader is not noticing errors, but always read it alongside the meaning, structure and visual analysis.
Do self-corrections count as errors?
No. In the standard running record convention a self-correction is not counted as an error. It is recorded separately and used for the self-correction ratio.
What accuracy level should I teach from?
Guided reading texts are usually chosen at 90 to 94% accuracy. Text at 95% or above is good for independent reading, and text below 90% is too hard for instruction without heavy support.