Chance After X Runs

Manifest V3 Free

View in Chrome Web Store Data as of 15 Oct 2026

A fun and light application to quickly calculate the probability of an event to occur based on the base chance and number of…

Users

−1 in 30 days

Rating

4.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#219K

#183K among extensions

Version

1.2.1

updated 21 Dec 2021

Users

monthly, 3 years

Latest, 15 Oct 2026: 7 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 years

Latest, 15 Oct 2026: 1 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About Chance After X Runs

A fun and light application to quickly calculate the probability of an event to occur based on the base chance and number of actions. The formula used is 1-(1-x)^y. The user may input the base chance as a percentage (0-100) or in a division format (base chance / actions). Can be used for a wide range of situations, ie. RPG's, bets with friends, even financial analysis. Changelog v1.2.1: - Flexible inputs including e-x values (i.e. 1.0e-2 interpreted as 1%), better comma-separated values handling.