Luckily, the average unsubscribe rate is very low – less than 1%!  GetResponse and Campaign Monitor estimates that the average unsubscribe rate is 0.10 - 0.12%, while Sendinblue calculate is at merely 0.05%. To work out your unsubscribe rate, you need to divide the number of subscribers who unsubscribed by the number of emails delivered and multiply the answer by 100.