Blundstone

The sizes listed for Blundstones are UK sizes, and they fit bigger than their North American size counterpart.

For men, subtract about 1 full size from your North American size to find your Blundstone size. IE) US Size 11 is about a Size 10 in a Blundstone.

For women, subtract about 2.5 sizes from your North American size to find your Blundstone size. IE) US Size 8 is about a Size 5.5 in a Blundstone.

The children's sizes go up to size 3 UK. For a child, subtract 1 full size from their North American size. IE) US Size 2 is about a Size 1 in a Blundstone.

The chisel toe boots (#057, #067, #068, #1306, #1308, #1309, and #1395) tend to fit a bit bigger than other Blundstones because of the square toe box. For women, subtract about 3 sizes, and for men subtract about 1.5 sizes for the chisel toe boots.

 The women's series boots (#1351,  #1352, and #1448) also tend to fit large. Subtract about 3 sizes for these boots.

Obviously this is only an estimate, as everybody's feet will fit a little differently.