I just bought a new Raleigh Road bike, the bike is a 60cm (and marked as such) but when in measure it get 57.5cm (22 5/8")

Also my old bike, Felt 45, which I bought used was sold to me as a 58cm (it is not marked with the size), but I measure it at 56.5cm (22 1/4")

Are bike labled taller than they actually are?
Is this common?

I am measuring from the top of the seatpost, in a straight line to the center of the crank

Trying to sell my old bike, but not sure if its a 58cm, like I was told, or a 56cm

Thanks!