Printable ring sizer
Download the PDF for your paper, print it at 100 percent (Actual size) and check that a bank card fits the box on the page. If it does, the strip and the ring circles are at true scale.
Download
Two pages: the scale check, a cut-out strip with a slit, and ring circles from US 3 to 13 in half sizes.
How to use it
- Print at 100 percent. In the print dialog choose Actual size or 100 percent. Never choose Fit to page, which shrinks the sheet and every size on it.
- Check the scale. Lay a bank card on the box on page one. The card should sit exactly on the line, and the ruler under it should measure 100 mm.
- Strip: cut out the strip and the slit, wrap the strip round the finger with the numbers outside, push the free end through the slit and read the number at the slit. The number is the inside circumference in millimetres (ISO). The marks allow for 0.1 mm office paper, so thick card reads a little large.
- Circles: lay a ring that fits flat on page two and find the circle that meets its inside edge. Read the US size under the circle.
What can go wrong
A printer that scales the page, a Fit to page setting or a browser that adds margins changes every size. That is what the scale box is for: if the card does not fit it, do not use the sheet.
A paper strip bends and stretches a little. The sizer is accurate enough to choose a size to try; a jeweller’s sizer remains the best check for a ring that cannot be returned.
Questions
How do I know the print is the right size?
The first page has a box of 85.6 by 53.98 mm, the size of a bank card, and a 100 mm ruler. If the card sits on the box line and the ruler reads 100 mm, the scale is right.
Do the circles show the outside or the inside of the ring?
The inside. Each circle is the inside diameter of its US size, so match the circle to the inside edge of the ring.