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CPM Calculator
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This CPM calculator converts raw typing data - total characters typed, time taken, and errors - into characters-per-minute, along with an equivalent WPM figure and accuracy percentage. CPM is a finer-grained measure than WPM since it doesn't average by word length, which makes it especially useful for languages or content with longer or shorter-than-average words, or for comparing performance on dense technical text. Enter your numbers below to get gross CPM, net CPM (adjusted for errors), the WPM equivalent, and accuracy, all calculated instantly.
Features
- Calculates gross CPM and net CPM (error-adjusted)
- Shows the equivalent WPM figure automatically
- Reports accuracy percentage alongside CPM
- Simple character count, minutes, and error inputs
- Instant recalculation as you adjust values
Why use this cpm calculator?
- Instant results with no page reloads or server round trips
- 100% private - everything runs locally in your browser, nothing is uploaded
- More granular than WPM for comparing dense or technical text
- Completely free with no signup, installs, or usage limits
Frequently asked questions
How do I convert CPM to WPM?
Divide CPM by 5, since the standard convention treats one word as 5 characters - this calculator does that conversion automatically.
What counts as a character for CPM?
Every keystroke that produces a character, including spaces and punctuation, following the same 5-characters-per-word convention used in WPM calculations.
Why use CPM instead of WPM?
CPM is a more precise, word-length-independent measure - useful for comparing speed across texts with very different average word lengths.
Does this account for typing errors?
Yes - enter your error count and the calculator returns both gross CPM (no penalty) and net CPM (errors subtracted) alongside your accuracy percentage.