Work out reaction time score instantly with clear inputs, formula shown and shareable results.
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.
Average
mean = sum of trials / number of trials
Versus reference
improvement % = (reference - mean) / reference x 100
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.
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.
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.