Take a sheet of A4 paper and put it on him with both feet. Outline pencil marks. Measure the distance ruler in length between the most distant points of the heel and toes. If your legs are slightly different in length (normal asymmetry) of the original size take more feet.
The resulting value measurement in millimeters divide by 3.2 to get your shoe size. So computed Russian size. English measurement in inches is removed, as well as the US.
Size skating boots should be selected half a size smaller than your usual. Feet should sit tight, fingers touching the toe of the shoe ahead. Heels should not budge. Do not try to buy skates larger considering wool socks, etc. The denser will sit feet in shoes, the more stable you will be on the ice, and then you will be more comfortable to ride, you'll be less to fall.
Is measured in the same shoes socks, which are going to use the skates.
The important is to select the size and fullness of the legs. If you do not know her, then use a standard table to determine this parameter.
Try skate shoes before buying. Feet should be comfortable in laced boots, in the areas of lifting and fingers should not be void. Must keep tabs on the movements of the foot, the heel should be pushed to the backs.
Sit in to put on and lace up boots for a while. Stand up, walk around in them. If you are comfortable, the legs do not move inside the boots back and forth and from side to side, then the size of skating boots matched correctly.