It’s actually more common to price voice over per minute or hour. The average speaking speed is 150 words per minute, so that speaking speed will determine how much each word will cost. Another factor that goes into the cost of voice over is the usage and whether it’s a broadcast or non-broadcast project. Voices provides a standard rate sheet that can help you price out your voice over project.
The length of time it takes a voice actor to record a voice over depends on their average words per minute, plus any additional time required for audio production. Calculate your words to time conversion for an estimated run time of the final audio.