Reaction Time Score Calculator

Work out reaction time score instantly with clear inputs, formula shown and shareable results.

About Reaction Time Score Calculator

The mean averages your trials, the sample standard deviation measures consistency, and the comparison expresses your mean as a percentage improvement on the reference. Consistency matters as much as speed: a 240 ms average with a 60 ms spread performs worse in practice than a 260 ms average with a 15 ms spread.

Formulas

Average

mean = sum of trials / number of trials

Versus reference

improvement % = (reference - mean) / reference x 100

Worked example

With the default values below, Reaction Time Score Calculator returns Average reaction time of 259.57. Change any input above and every figure here is recalculated in your browser.

Inputs used

Reaction times in milliseconds (comma separated): 268, 241, 295, 252, 233, 279, 249
Reference averageminimum 1 ms: 250 ms

Results

Average reaction time: 259.57 ms
Fastest trial: 233.0 ms
Consistency (standard deviation): 22.07 ms
Faster than the reference average by: -3.83%

Step by step

1Values used
2Average
3Versus reference
4Average reaction time= 259.57 ms
5Fastest trial= 233.0 ms
6Consistency (standard deviation)= 22.07 ms
7Faster than the reference average by= -3.83

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Reaction Time Score figure worked out?

mean = sum of trials / number of trials. The mean averages your trials, the sample standard deviation measures consistency, and the comparison expresses your mean as a percentage improvement on the reference.

Why does this matter?

Consistency matters as much as speed: a 240 ms average with a 60 ms spread performs worse in practice than a 260 ms average with a 15 ms spread.

What do I need to enter?

Enter reaction times in milliseconds (comma separated), reference average. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.