Before you start crocheting a hat, you need to get the measurement of your head first. This is the most essential and fundamental thing you need to do before anything else. Without your head measurement, you cannot determine how many yarns you will need for your hat. You need to measure your head circumference and the hat length. To know the measurement of your head, get a tape measure. Follow the steps below: Head circumference – Wrap the tape measure around your head. Rest it in the middle of your forehead. Remove it and look where the metal part of the measuring tape points. That is the circumference of your head. Hat length – Place the end of the tape measure on the top center of your head. Run it down the side until the base of your ear. Mark it with your finger and see the measurement. That is the length of your hat. Never forget to get the measurement before you start crocheting your hat. It will be difficult to start without knowing your head’s size and the hat length.