What is the Formula to Find Percentage Error?

To find the percentage error, take the difference from accepted value (which is also the result minus the accepted value), divide by the accepted value and then multiply this result by 100. Example: Your estimated house payment was $1015, the actual house payment ended up being only $1000, Take the 1015 and subtract 1000 = 15. Next, take 15 and divide by the correct monthly house payment. 15/1000 = 0.015. Then, multiply 0.015 by 100 = 1.5%. So the final percentage error in your house payment equals 1.5%