Print one page, check the scale, and find your ring size on paper. The free PDF has true-size circles for US sizes 4 to 12.5 (with UK sizes and mm), a cut-out finger strip, and a 50 mm check line plus a bank-card box so you can confirm it printed at the right size. Choose US Letter or A4 to match your paper.
One page, free, no sign-up. Print at 100% / Actual size.
Step 1: Print it at the right size
A printable sizer only works if the printer does not shrink the page. Most printers default to “Fit to page”, which scales everything down by 3–6% – enough to make a ring look one full size smaller.
- Chrome or Edge: open the PDF, press Print, open “More settings” and set Scale to Default or 100, not “Fit to printable area”.
- Adobe Acrobat Reader: under Page Size & Handling choose Actual size.
- Mac Preview: set Scale to 100% and untick “Scale to fit”.
- Phone: sending the PDF to a printer from a phone often scales it. If the check line is not 50 mm, print from a computer instead.
Step 2: Check the scale
Before you measure anything, put a ruler on the line at the top of the sheet. It must be exactly 50 mm (5 cm) long. Then lay a bank card, debit card or ID card in the dashed box: all of these cards are 85.6 × 54 mm worldwide, so the card should fit the outline exactly. If the line is 48 mm or the card overhangs the box, the page was scaled; reprint at 100%. Do not try to correct it by eye.
Step 3: Measure
With a ring that fits
- Lay the ring flat on the circles.
- Find the circle whose line sits exactly on the inside edge of the ring, with no paper showing inside the circle line and no line hidden under the metal.
- If the ring falls between two circles, choose the larger size.
With the finger strip
- Cut out the strip along the dashed line.
- Wrap it around the base of the finger with the numbers facing out, so the 0 end overlaps the scale.
- Pull it snug but not tight, then slide it over the knuckle to check it still passes.
- Read the US size at the point where the end of the strip meets the blue scale. The mm scale underneath gives the circumference if you prefer to look it up in the ring size by circumference table.
How accurate is a printable ring sizer?
The circles in the PDF are drawn as vectors to 0.01 mm, so the limit is your printer and your eye. A correctly scaled print is typically within 0.2–0.3 mm, or about half a size at worst. The ring-on-circle method is more reliable than the paper strip, because paper can stretch or be wrapped at an angle. For a second opinion without paper, use the on-screen ring sizer, which is calibrated with the same bank card.
Common mistakes
- Measuring the outside of the ring. Only the inside edge matters.
- Skipping the scale check. A 5% shrink is invisible to the eye but changes the result by a whole size.
- Using thin printer paper for the strip. Thicker paper or card stock stretches less.
- Measuring cold fingers. Measure in the evening at room temperature.
Prefer not to print?
You can do the same thing on your phone: the online ring sizer draws true-size circles after a one-time card calibration. If you already have a measurement, the ring size calculator converts it directly, and the step-by-step guide on how to measure ring size at home compares every method.
Frequently asked questions
How do I make sure my printable ring sizer is the right size?
Print at 100% or “Actual size” and measure the check line with a ruler: it must be exactly 50 mm. A bank or ID card should also fit the dashed card outline exactly.
Can I print a ring sizer on A4 paper?
Yes. Download the A4 version. The circles are the same size on both versions; only the page layout changes.
Why does my printed ring sizer seem too small?
The printer most likely used “Fit to page”, which shrinks the sheet by a few percent. Reprint with scaling set to 100%.
Is a printable ring sizer accurate?
When printed at 100% it is usually accurate to about half a size. Matching an existing ring to the circles is more accurate than wrapping the paper strip around your finger.