Reaction Time Percentile Calculator | What % of People Do You Beat?

Enter the game, get your millisecond score, and SERO converts it into a real percentile against published reaction-time distributions.

How Percentile Scoring Works

Human reaction time follows a roughly log-normal distribution. We map your median score onto that curve and return your percentile — top 50%, top 10%, top 1%.

Reference Percentiles (ages 18–35)

| Percentile | Reaction (ms) | |---|---| | Top 1% | < 175 | | Top 5% | < 195 | | Top 10% | < 210 | | Median (50%) | 245–260 | | Bottom 25% | > 285 |

Find your percentile

FAQ

Is the percentile age-adjusted?

Yes — your score is compared inside your age band so a 45-year-old top-1% is treated correctly.

Is it free?

Yes. No signup, no install.

How many runs are needed for a stable percentile?

3 runs is enough; 5+ smooths variance further.