How many errors should I expect from a proofreader?

Question

I hired a proofreader (typos, commonly confused words, minor grammar issues etc) to look at my work, which I plan to self publish.She found most typos, but from a 66,000 word novel, missed about 10. Things like using 'its' instead of 'it's', 'you' for 'your' etc. I found these on my own last read.Now I realise nobody is perfect, but if I'm hiring a professional proofreader, how many errors are acceptable?

Answer 1

10 missed errors out of a 66,000 word novel is honestly not too bad. human error should be accounted for -- a few things can be missed, even by professionals.

Having said that, you can always be transparent with your tutor and express your concerns. If I am hired for a proofreading job, I'd aim for no errors. like you did a final read through -- your tutor should have done the same. the margin for human error shouldnt be >1%.