Everyone says voice typing is faster. Tool websites claim "3x your productivity." Reddit posts say it changed their life.
But nobody actually shows you the math.
How many minutes per day? How many hours per week? How much of your actual work life — your emails, your Slack threads, your reports, your proposals — could genuinely be reclaimed if you stopped typing and started talking?
We did the full calculation. Not vendor estimates. Not vague "3x faster" marketing claims. Real numbers, sourced from real research, applied to the actual writing workload of a typical knowledge worker in 2026.
Here's what we found.
First, Let's Agree on the Numbers
How fast do people actually type?
According to data from over 56,000 participants surveyed in 2025, the global average typing speed for adults sits at 40–52 WPM — with the commonly cited "average knowledge worker" landing at 40 WPM.
Professional heavy typers (writers, data entry clerks) may hit 65–80 WPM. But for the purpose of this calculation, we'll use three profiles:
How fast is voice typing?
Stanford University HCI research measured average speech input at 161 WPM for English speakers. The National Center for Voice and Speech (NCVS) pegs natural conversational English at 150 WPM on average. Modern AI dictation tools with error correction realistically deliver 120–140 WPM effective output speed — accounting for pauses, minor corrections, and thinking time.
For this calculation, we'll use 130 WPM as the effective voice typing speed — a conservative, real-world estimate that factors in correction time and natural pauses.
The ratio: voice typing is 3.25x faster than average typing, and 1.6x faster even for fast typists.
How Much Does a Knowledge Worker Actually Write Per Day?
This is where most "voice typing saves time!" posts fall flat — they quote typing speeds but never quantify the actual writing workload. So let's quantify it.
Emails
Microsoft's 2025 Work Trend Index, based on real telemetry from Microsoft 365, reports the average knowledge worker sends approximately 40 emails daily. McKinsey Global Institute calculates email consumes 28% of the workweek — roughly 11.7 hours per week. The average sent business email is approximately 100–150 words. At 40 sent emails/day × 125 words average: