The Television Rating Point is a measurement of the percentage of households in the United States who are tuned to a specific program.It was developed by Nielsen Company in the 1950s and is still used today for advertisers to find out how many people watched their commercials.The formula for TV ratings point is.Program rating = Average number of viewers/Average number of homes with televisions.A program's rating can also be determined by multiplying its share (the percentage of television homes that were watching it) times one hundred.To determine whether or not an event has reached "ratings gold," it must have at least 50% more viewers than normal, which would be about 5-10 million viewers on average per episode.