Reaction Time Estimator
Estimate reaction time from a ruler drop test. Enter the distance the ruler fell before you caught it to calculate your reaction time in milliseconds.
Reaction Time
175 ms
Reaction Time vs Ruler Drop Distance
How the Ruler Drop Test Works
Formula
Reaction Time = sqrt(2 x Distance / g)
Where distance is in meters and g = 9.81 m/s^2. The result is in seconds; multiply by 1000 for milliseconds.
How to Perform the Test
1. Have a partner hold a ruler vertically at the 0 cm mark between your open thumb and finger. 2. Without warning, the partner drops the ruler. 3. Catch it as quickly as possible and read the cm mark where you caught it.
Benchmarks
Example Calculation
The ruler fell 15 cm before being caught.
- 01Distance in meters = 15 / 100 = 0.15 m.
- 02Reaction time = sqrt(2 x 0.15 / 9.81) = sqrt(0.0306) = 0.175 sec.
- 03In milliseconds = 175 ms.
- 04Rating: Good (150-200 ms range).
Frequently Asked Questions
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