In a movie theater, it is expected to ignore a phone call while the film is playing. But when nature dials your body’s number, that’s a call that may not be possible to leave unanswered.

The problem is a trip to the bathroom could mean missing key plot points, resulting in the tricky decision of “hold or go.”

Luckily, there’s an app for that.

RunPee lets the viewer know, down to the minute, when and for how long to get up and use the facilities during a movie. The app gives an overview of what occurred during a trip to the loo.

A timer can be set within the app to let movie-goers keep track of how long they’ve been gone.

There are 636 movies in the app’s database. They can be sorted in order of release date in time intervals of six, 12 or 24 months. Films can also be sorted alphabetically.

The app also provides a synopsis of a movie’s first three minutes in case of a late arrival.

An additional feature is the app shows whether or not there is more movie after the end credits.

RunPee costs 99 cents and is available for iPhone, iPad and Android devices as well as Windows phones.