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Accuracy first or speed first? Ninety-five percent is the dividing line

September 20, 2026 · about 639 words · Speed and accuracy

The advice "slow down to speed up" sounds like a slogan until you look at what an error actually costs.

Correcting a mistake is not one keystroke. It is: notice the error, press Backspace (possibly several times), re-type the characters, and re-establish your place in the text. Realistically that is one to two seconds for a single-character slip — and it interrupts the chunk you were in the middle of, which costs more on top.

Do the arithmetic

Say you type 60 WPM at 95% accuracy. In a minute you produce 300 characters, of which 15 are wrong. At 1.5 seconds each, correction costs 22.5 seconds — more than a third of the minute. Your effective output is closer to 38 WPM.

Now type 50 WPM at 99% accuracy. 250 characters, 2–3 errors, about 4 seconds of correction. Effective output: roughly 47 WPM.

The slower typist produces more usable text. And this calculation understates the case, because errors also cost attention: every correction pulls you out of composing and back into letter-level typing.

Why 95% is the line

Below roughly 95%, errors stop being isolated events and start clustering. When mistakes cluster, you are no longer making random slips — you are repeating a specific wrong movement, and each repetition strengthens it.

That is the real argument for accuracy first. It is not about pride in a clean transcript; it is that practising below 95% accuracy actively installs the error you are trying to remove. You get faster at being wrong.

Above 95%, the remaining errors are usually genuine slips or unfamiliar words, not systematic bad habits. At that point you can push speed, because the mistakes are noise rather than signal.

How to use the line in practice

• Below 90%: Stop and slow down. You are practising errors. Drop to a speed where you are right almost every time, even if it feels embarrassingly slow.
• 90–95%: Maintain. Do not increase speed yet. Focus on the specific keys you are missing.
• Above 95%: Increase speed in small steps. Push until accuracy falls to about 93–95%, hold there for a session, then push again.

The pattern is: push, recover, push, recover. Not push continuously.

The exception worth knowing

There is one situation where you should accept low accuracy temporarily: practising a genuinely new key or a new layout. When you first drill a key that has never been automatic, you will miss it often. That is learning, not bad habit — as long as you are slow and deliberate, and as long as each miss is followed by a correct, conscious repetition.

The dangerous version is different: fast, sloppy, and inattentive. That is where permanent errors come from.

Where to look instead of the overall number

Your overall accuracy is an average, and averages hide the thing you need. A 96% typist might be at 100% on everything except four keys, which they miss half the time. Those four keys are the whole problem, and the overall number tells you nothing about them.

Break the errors down by key. The error heat map in the progress panel does exactly this, and it is almost always more useful than the headline accuracy figure — usually two or three keys account for the majority of the damage.

What accuracy to aim for by context

Different work has different tolerances:

• Learning something new: 97%+. You are installing a pattern.
• Normal productive typing: 97–99% is realistic and comfortable.
• Transcription from audio: 99%+; the source cannot be re-read.
• Numeric data entry: 100%. A transposed digit is not a typo, it is a wrong number, and it will not be caught by reading.

The last one is worth dwelling on: in numeric work, accuracy is not a quality metric you trade against speed — it is the entire job. This is why 10-key training emphasises accuracy to the point of tedium.