Just take your ruler and measure straight across the inside of the ring from edge to edge.
Check ring size online.
Adjust the slider with the and buttons until the size of the picture matches the size of your credit card.
Almost every online jewelry store provides you an option of printing out a variation of a ring sizer.
Be careful not to wrap the paper too tight.
If the ring falls between two sizes choose the larger size.
Here is one from james allen which allows you to wrap the strip around your finger and find the number that fits the slot which will be your ring size.
Use a ring that fits measure your finger or request a free sizer.
If you have a ring that already fits your finger well you can use a ruler to measure the inside diameter of this ring.
Wrap string or paper around the base of your finger.
Print the ring size chart making sure that it is printed to actual size.
This helps you to convert between units of ring measurements.
To find your ring size wrap a flexible measuring tape around the widest part of your finger near the knuckle.
The arrow will point to your ring size.
To find the international ring sizing chart check here.
Measure the string or paper with a ruler mm.
Place your credit card on the screen below.
Measure your ring size with these steps.
Line the string up with the ring size guide provided on the ring size chart.
Method 3 printable ring sizer.
No need for printing or waiting for mail delivered ring sizer.
Mark the point where the ends meet with a pen.
Slip the pointed end through the slit and place around your finger.
This sets the screen at the right dimensions so the ring size will be accurate.
If you have measured the finger to be sized with string or know the circumference in millimeters use the following chart to convert the length to a ring size.
Pull the pointed end so it slides to a sung fit.
Cut along the dotted line marked find your size to make a slit.
Wrap a piece of string around your ring finger and cut it at the point where the end overlaps.
Aim for a snug but comfortable fit and make sure to measure the exact finger where you plan to wear the ring since even the same finger on different hands can be different sizes.
Print our paper ring sizer via the print icon above.
Pick the closest measurement on the ring size chart to find your ring size.