Step 1: Stand up straight on a hard surface with your heel against the wall and a piece of blank paper taped to the floor.
Step 2: Mark the heel-to-toe length on the paper with a pen or pencil. Repeat with the other foot, as sizing may vary.
Step 3: Use a ruler to measure the heel-to-toe length marked for each foot.
*it is recommended to do this while wearing the type of socks you'd wear with these sneakers*
If after doing that and still not being sure of your size and fit, visit: www.converse.com/size-chart-guide for more specific information.