Normally, when I have a conversation with someone about story length, it's because the writer has written an opus that needs to be trimmed down. This is often the result of too much backstory or unnecessary word building and character description that only distracts from the story as a whole. Trimming a story down is where I'm the queen. (Okay, I'll admit it... I overwrite my own stories in early drafts. I've developed the skills and techniques needed to trim word counts quickly, bringing a story back in line with where it should be.)

However, occasionally, I find myself having a conversation about how a story is actually too short based on the elements presented. There might be too many named characters. Or the setting plays too big of a role for the word real estate available. Or perhaps, there were too many twists and turns and not all the threads were adequately explored.

This is more often seen in shorter story forms, like short stories and novellas, and trying to explain the minimum word count needed to do a story justice is not an easy concept to fathom.

In episode 12.27 of the podcast Writing Excuses, Mary Robinette Kowal introduced an equation that she uses to work out how long a story should be based on the number of characters, number of locations and the number of MICE elements (and NO, I'm not talking about those little things that go squeak, squeak, or those devices that we click repeatedly when the computer refuses to respond). So, let's get to it and break the mathematics down.