Firstly, measure your feet from your toe to heel in centimeters.
Crocs should not fit like other shoes.
They should fit very loosely.
The sides of your foot should not really touch the sides of the shoe.
Your toes should never make contact with the front of the shoe. -- Crocs Malaysia
In other words, you should pick a size bigger than your normal shoes' size, to avoid unfittingly-small circumstances!
Here you go.
Women:
1. Olivia/Malindi/Prima/Sassari/Alicemax~22.5cm--W5
max~23.5cm--W6
max~24.0cm --W7
max~24.5cm--W8
max~25cm--W9
2. Cyprusmax~22.5cm---W6
max~23m------W7
max~24cm ----W8
max~25.5cm---W9
3. Santa Cruzmax~21cm ---W5
max~22cm ---W6
max~23cm ---W7
max~24cm ---W8
Men:1. Santa Cruzmax~23cm--M7
max~24cm---M8
max~25m----M9
max~26cm -M10
max~27cm---M11
2. Offroadmax~23cm---M7
max~24cm---M8
max~25cm---M9
max~25.5cm -M10
max~26cm----M11
max~26.5cm--M12
3.Bayamax~23.5 cm----M8
max~24 cm------M9
max~24.5m-----M10
max~25 cm -----M11
max~26 cm-----M12
Kids:max~13.5cm---Child 4/5
max~14cm ----Child 5/6
max~14.5cm --Child 6/7
max~15.5cm---Child 7/8
max~16cm ----Child 8/9
max~16.5cm --Child 9/10