Reaction Time Calculator

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Ruler drop: convert a physical fall distance to reaction time. Hick's Law: model how adding choices slows response. Driving: see how far your car travels during your reaction time.
How far the ruler fell before you caught it, measured from the 0 cm mark.
cm
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cm
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cm
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cm
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cm
Reaction timeExcellent
174.9ms

Your calculated reaction time

Reaction time (seconds)0.175s
Performance ratingExcellent
174.9 ms
Exceptional<150Excellent150-200Average200-251Below average251-351Slow351+

Your reaction time is 174.9 ms - excellent.

  • Your reaction time of 174.9 ms is faster than the typical visual average of 220 ms.
  • A ruler drop of 15 cm corresponds to about 175 ms, calculated using the free-fall equation t = sqrt(2d/g).
  • Reaction time improves with practice, adequate sleep, and low fatigue. Alcohol, distractions, and age all slow responses.

Next stepTry five trials and compare the average to your best single attempt to see how consistent you are.

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