My street shoes are size nine, my hockey skates are sizes 6.5 and 6.75. My toes almost touch the ends of my street shoes, skate sizing is weird.
Bear in mind that different models and makes of skate will fit different foot shapes, so it's not just the length, it's the shape too. For example, I have flipper shaped feet: narrow heels, flat and wide(ish) at the front. Some people have wide heels , a deep forefoot and pointy toes.