Share this

Last Updated: Nov. 9, 2015

Expected Trials Calculator


The purpose of this calculator is to determine the expected number of trials to achieve every possible outcome of repeated random event. To use it, enter into the fields the probability, or number of combinations, for every possible event. If there are less than 19, just use as many fields as you need. Then just click calculate.

For example, consider the question of how many rolls of two dice does it take, on average, to throw every total from 2 to 12? The number of combinations for totals of 2 to 12 goes 1,2,3,4,5,6,5,4,3,2,1. So enter each of those numbers of combinations, click calculate, and you will get the correct answer of 61.217385.

Event 1 =
Event 2 =
Event 3 =
Event 4 =
Event 5 =
Event 6 =
Event 7 =
Event 8 =
Event 9 =
Event 10 =
Event 11 =
Event 12 =
Event 13 =
Event 14 =
Event 15 =
Event 16 =
Event 17 =
Event 18 =
Event 19 =



Expected trials =