About True Size Ring

True Size Ring is a free tool for finding your ring size at home, built to fix the one thing that trips people up: the print scale.

Why we built it

Search for a printable ring sizer and you find plenty of them. Almost every one tells you to print at 100%, then leaves you to hope your printer listened. Most printers shrink a page a little to clear their margins, and on a ring that is enough to read a size too small. People measure carefully, order a ring, and it arrives too tight.

So we put the proof on the page. Every True Size Ring sheet carries a 50 mm ruler and an outline the exact size of a bank card. Print, check those two marks, and you know in seconds whether the rest of the sheet is true to scale. If it is, the size you read is the size you order.

How the sizes are calculated

The sizes use the US standard, where a ring's inside circumference equals 36.54 plus 2.55 times the size, in millimeters, which is the basis of ISO 8653. Every circle, strip mark, and converter result comes from that one formula, so the printable, the chart, and the on-page converter always agree. The UK, EU, and Japan equivalents are matched by inside circumference.

What we do not do

We do not sell rings, take an account, or send anything you type to a server. The PDF is built in your browser. We would rather be the free, honest tool you come back to than a storefront with a sizer buried at the bottom.

Have a question or a fix to suggest? Send us a note.