Free tool
Printable ring sizer
Print this ring sizer at 100%, check that its line measures exactly 10 cm, then wrap the finger strip around the base of your finger or lay a ring you own on the circles. It comes in A4 and US Letter. The strip reads US 3 to 13, and the circles cover US 4 to 12.
How to use the ring sizer
Step 1
Print at 100%
Open the PDF for your paper size and print it at 100% (Actual size). Turn off Fit to page, Scale to fit and Shrink oversized pages, and print one page per sheet.
Step 2
Measure the check line
Lay a ruler along the line at the top of the sheet. It should measure exactly 10 cm. Then lay a bank card on the box: it is 85.60 × 53.98 mm, the ISO/IEC 7810 ID-1 card size, so the card should fit it exactly. If either check is off, print again at 100%.
Step 3
Wrap the strip or match a ring
Cut out the finger strip and wrap it around the base of your finger, printed side out, with the labeled end on top of the scale. Or lay a ring that fits on the actual-size circles.
Step 4
Read your size
Read the US size at the edge of the labeled end, or under the circle that lines up with the inside edge of the ring. The strip also has a millimeter scale from 40 to 75 mm, and the number at the same edge is your inner circumference.
What a wrong print scale does to your size
A sheet that prints even slightly small makes the strip and the circles read large. At 98% scale the 10 cm line measures 9.8 cm, and a US 7 finger, 54.4 mm around, reads most of the way to the US 7.5 mark. At 95% the line measures 9.5 cm, the same finger reads about US 8, and a US 7 ring lines up with the US 8 circle. One half size is only about 0.4 mm of inner diameter, so check the line with a ruler before you cut anything. If it is off by even 1 mm, print again at 100%.
After you measure
The sizes on the sheet come from our ring size chart. To turn your US size into a UK, EU, Japanese or Indian size, use the ring size converter. To see a ring on a hand before you buy or list it, try the virtual ring try-on.
Frequently asked questions
Yes, if it prints at true size. Printers often shrink a page to fit their margins, which makes every circle and mark too small, so the sizer reads large. Print at 100% (Actual size), measure the 10 cm line with a ruler and lay a bank card on the box. Use the sizer only when both match. For a ring a jeweler cannot resize, such as an eternity ring or a tungsten ring, confirm the size at a jeweler before you order.
Yes. Read the millimeter scale on the strip, which runs from 40 to 75 mm, and type that number into the ring size converter as an inner circumference. It shows the same ring in US, UK, EU, Japanese and Indian sizes: a finger that reaches 54.4 mm is US 7, UK N½ and EU 54.
Use the circles when you have a ring that already fits the same finger: lay it on the sheet and find the circle that lines up with its inside edge. Use the strip when you have no ring. Wrap it snugly but not tight at the base of the finger, later in the day, because fingers swell when warm and shrink when cold.
Choose the larger size. A wide band, from about 4 to 6 mm, usually needs a quarter to half size up, and if your knuckle is large, measure both the knuckle and the base of the finger and choose a size in between.
Cut a thin strip of paper, wrap it around the base of your finger and mark where the ends meet. Lay it flat against a ruler and read the length in millimeters. Type that number into the ring size converter as an inner circumference. The ring size chart walks through this method and two others.
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