To determine the size you need for your magnetic bracelet or anklet measure your wrist or ankle with a soft flexible measuring tape and add 1/2 an inch to 1 inch for comfort. A 1/2" added will fit similar to a watch and a 3/4" added will give a little wiggle room. You can add up to an inch if you like it to fit loose. To get the most benefits from your magnets they need to be touching the skin. My wrist (pictured below) measures just under 6 1/2 inches. I would order a bracelet between 7 inches and 7 1/2 inches depending on how loose I want it to fit. (see image below.) 
If you do not have a measuring tape you can use a piece of string or ribbon. Mark the length then measure with a ruler. You can also measure a bracelet or anklet that you like the size of.
Please note: Depending on the bead configuration of your bracelet or anklet it may vary from the size you order by up to approximately 1/8 inch. We make all effort to get "as close as possible" to the size you order.
**Please note** Some flexible measuring tapes do not start measuring at the very end. Be sure to star measuring from the "0" mark.