Speaking Time Calculator (speech length from words or Korean syllables)

Understanding the speaking time calculator — concept and principle

This calculator estimates how long a script will take to say out loud, from its length and your speaking pace. It counts English in words and Korean in syllables. Use it for speeches, presentations and voice-overs.

Time grows in step with the script: 760 words at 140 per minute take about 5 min 26 s.

How it is calculated

Speaking time (minutes) = script length ÷ pace per minute

Script length for a target = target minutes × pace

Over or under = speaking time − target minutes

Script length is a word count for English or a syllable count for Korean. For Korean, the number of characters without spaces is a good syllable count, because each Hangul block is one syllable.
Pace is words per minute (English) or syllables per minute (Korean). The calculator uses the pace that matches the language you picked.

The principle

Speech is close to a steady flow. Over a few minutes a speaker's rate, including the short pauses between phrases, stays fairly stable, so time is simply amount divided by rate. English is counted in words because English words are short and fairly even. A Korean word unit (어절) can carry a noun plus several particles and endings, so its length varies a lot; syllables are a much more even unit. Measured rates give a starting point: Korean adults reading aloud average about 5 syllables per second including pauses, about 300 per minute, and English conversation runs at roughly 160–200 words per minute. Presentations are usually slower than conversation, so 120–150 words per minute is a common planning pace.

Worked example

Default inputs: English, 760 words, 140 words per minute, 5 minutes allowed.

Speaking time = 760 ÷ 140 = 5.43 minutes, which is about 326 seconds, shown as 0:05:26.
Script length that fits 5 minutes = 5 × 140 = 700 words.
Over the target = 5.43 − 5 = 0.4 minutes.
Fits the target? No — cut about 60 words (760 − 700).

How to read the result

Treat the time as the minimum you will need. Live delivery adds pauses for slides, audience reactions and questions, so leave about 10 % spare time. The best figure is your own: read one minute of your script aloud, count how far you got, and enter that number.

Common mistakes

Counting Korean in words (어절) instead of syllables, which makes the estimate swing widely.
Using a fast conversation rate for a formal speech.
Forgetting time for slides, demos, jokes and applause.

Keep in mind: Speaking rates differ widely between people and situations. The result is an estimate; rehearse with a timer before an event where the limit is strict.

Frequently asked questions

How many words is a 5-minute speech?

At 130–150 words per minute it is roughly 650–750 words. Measure your own pace for a closer number.

How do I count Korean syllables quickly?

Use the "characters without spaces" count in your word processor. Remove numbers and symbols, or count how they are read.

Should I speak faster to fit the time?

Usually not. Rushing makes speech harder to follow; cutting content works better.

Sources: Hwang J. & Lee S. (2012), "Speech rate and pauses in the speech of migrant women from multicultural families", Journal of the Acoustical Society of Korea 31(2):63–72 · Yuan J., Liberman M. & Cieri C. (2006), "Towards an integrated understanding of speaking rate in conversation", Interspeech 2006

Checked 9 Nov 2026. Korean: Hwang J. & Lee S. (2012), “Speech rate and pauses in the speech of migrant women from multicultural families”, J. Acoust. Soc. Korea 31(2):63–72 (Korean reading rate 5.04 syllables/s); English: Yuan J., Liberman M. & Cieri C. (2006), “Towards an integrated understanding of speaking rate in conversation”, Interspeech 2006 (conversation about 164–196 words/min).

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