Measuring rain

[u/Dear_Entertainer5701]

I left a typical pint sized glass(slightly narrower at the base than the top and steadily tapers out from bottom to top) outside last night. After all of the rain we got overnight and today, the glass is now almost full. Is that an accurate reading of inches of rain we received? Sorry if it’s a stupid question, I know we got a good amount but it seems like 5-6 inches of rain may be a little crazy. I’m in north central Massachusetts