Printable Ring Sizer
A free, printable sizing sheet with a built-in calibration check — so you can trust the measurement, not just the printout.
This tool requires a printer
How to use it
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Print at 100% scale
Open your browser's print dialog and set scale to 100% or "Actual size." Turn off "Fit to page" or "Shrink to fit" — these resize the page and will throw off every measurement.
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Check the calibration box
Measure the printed box below with a ruler, or lay a credit card on top of it. It should measure exactly 85.6 × 54mm (3⅜" × 2⅛"). If it's off, adjust your printer's scale and print again.
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Measure your finger or a ring
Wrap a strip of paper around the base of your finger and read the overlap point against the printed ruler — or place a ring you already own over the circles to find the closest match.
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Get your exact size
Enter your circumference, diameter, or ring measurement into the Ring Size Calculator to see your exact size in US, UK, EU, and Japan sizing.
Most printing mistakes come from page scaling
Calibrate print scale
Hold a card or coin against the box below and drag the slider until the box matches it exactly. The printable content will scale to match — then hit Print.
Set scale to 100% in your print dialog
Firefox: Scale → set to 100%
Safari: Show Details → Scale → 100%
Preview — what gets printed
On screen, this is shown at roughly real-world size depending on your display, but only the printed version is guaranteed accurate. Always verify with the calibration box first.
Step 1 — Calibration check
This box should measure
85.6 × 54mm (3⅜" × 2⅛")
— the size of a credit card
Step 2 — Finger circumference ruler
Each small mark is 1mm; large marks are every 10mm. Wrap a strip of paper around your finger, mark the overlap, then lay it flat against this ruler starting at 0.
Step 3 — Match an existing ring
US 3–7
US 8–12
US 13–17
Place a ring that already fits over each circle. The size where the ring's inner edge lines up with the circle's edge is your closest match.
When to see a jeweler
Frequently asked questions
Why does the calibration box matter so much?
Most browsers and printers default to a print scale that slightly shrinks pages to fit the printable area, which can throw off every measurement on this page by several percent — enough to be a full ring size off. The calibration box gives you a fixed reference (a standard credit card) so you can confirm your printout is true to size before measuring anything.
What if I don't have a printer?
Use the Guess Ring Size tool for a no-measurement estimate, or borrow a ring that already fits and measure its inner diameter against any rigid ruler — a sewing tape measure, a school ruler, or a printed ruler from a friend's printer that's been calibration-checked.
Can I just measure on my phone or laptop screen instead of printing?
No — screen sizes and resolutions vary too much for on-screen measurements to be reliable, even though this preview is shown at roughly real-world scale. Always print and use the calibration box to confirm accuracy.
The circle method and the strip method gave me different results — which should I trust?
Small differences (a quarter size or less) are normal, since fingers aren't perfectly round and paper strips can stretch slightly. If they disagree by more, lean toward the circle method using a ring that already fits, and re-check your calibration box before trying the strip method again.
What should I do with my measurement once I have it?
Head to the Ring Size Calculator and enter your circumference, diameter, or existing ring measurement to get an exact size across US, UK, EU, and Japan sizing systems, along with a confidence level.
Go further
Turn your measurement into an exact, confident size.