How to calculate WPM and accuracy

A standard "word" in typing tests is five characters, including a space. That convention lets tests compare passages with different word lengths. The formula is:

WPM = correct characters ÷ 5 ÷ minutes

If you type 300 correct characters in one minute, divide 300 by 5 to get 60 standard words, so the result is 60 WPM. For a thirty-second test, divide by 0.5 minutes. For a two-minute test, divide by 2. The time should be the actual elapsed time, not the duration you selected if you stopped early.

Some tests call this "net WPM" because they use only correct characters. A "gross WPM" calculation uses every character typed, including wrong ones. Gross WPM can look impressive even when the text is full of errors, which is why accuracy belongs beside it.

Accuracy is the share of typed characters that were correct:

Accuracy = correct characters ÷ all typed characters × 100

Suppose you type 240 correct characters and 10 wrong characters. Your total is 250 characters, so accuracy is 240 ÷ 250 = 0.96, or 96%. If you backspace and fix a wrong character, the final text may contain only correct characters, but the original mistake still affected the time and may still count as an error depending on the test.

Accuracy and speed should be read together. A result of 80 WPM at 85% accuracy means a lot of time went into corrections. A result of 60 WPM at 98% accuracy may produce more usable text in the same minute.

Imagine a one-minute test. You type 280 correct characters and 20 wrong characters. Your total is 300 characters. Gross WPM is 300 ÷ 5 = 60. Net WPM, using only correct characters, is 280 ÷ 5 = 56. Accuracy is 280 ÷ 300 ≈ 93.3%.

If the same typing took two minutes instead, net WPM would be 280 ÷ 5 ÷ 2 = 28. The accuracy would stay the same because it compares characters, not time. This is why a longer test can produce a lower speed without meaning that your fingers moved more slowly.

The arithmetic is simple, but the counting rules are where most confusion starts. Before comparing two results, check whether the test counts spaces, whether it subtracts errors, and whether it uses correct characters or all characters.

The first mistake is mixing durations. A 15-second sprint and a two-minute run measure different things. The second is comparing a test that subtracts errors with one that does not. The third is rounding too early: divide by the exact time in minutes, then round the final result.

Another mistake is counting only the words in the passage and ignoring partial words. WPM is character-based for a reason. If you stop in the middle of a word, those characters still took time and still belong in the calculation.

Finally, do not treat a single run as a stable measurement. Warm-up, sleep, keyboard familiarity and the difficulty of the text all move the number. Use several runs of the same length and look at the pattern.

The type-type test reports WPM and accuracy for the same run, so you do not have to calculate them by hand. It uses correct characters for speed and tracks mistakes as you type. Choose a duration, type normally, and read the two numbers together.

If you are checking a keyboard rather than measuring speed, the keyboard tester is the better tool. It shows which keys the browser receives and can help you separate a typing problem from a hardware problem.

Keep your own log if you want to compare formulas or track progress. Record the duration, correct characters, mistakes and accuracy. With those numbers, you can reproduce the calculation and see why two tests disagree.