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1:1 PRINTABLE MANDREL & CIRCLE CHART · ISO 8653

Printable Ring Sizer Chart (Actual Size Circles & Paper Strip)

Prefer a physical paper sheet? Print this page at 100% Actual Size (disable “Fit to Page”) to match an existing ring against our 1:1 millimeter circles—or skip printer scaling errors entirely using our calibrated on-screen optical sizer.

Use On-Screen 1:1 Sizer (No Printer Needed)

Step 1: Verify Your Printer Scale (Mandatory 50 mm / 85.6 mm Check)

Critical: In your browser’s print dialog, set Scale = 100% (Actual Size / Custom 100%) and Margins = Default. After printing, lay a standard credit card (85.60 mm wide) or metric ruler against the verification bar below before trusting any printed circle:

0 mmISO/IEC 7810 ID-1 CREDIT CARD WIDTH CHECK (85.60 mm)85.6 mm
← 85.60 mm (Standard Credit Card Width) →

Step 2: Match Your Ring’s Inner Bore to the 1:1 Circles

Place your ring flat over the circles below. The correct ring size is the circle whose outer black/gold border touches the inside metallic wall of your ring on all sides. Click any circle to load that exact diameter into our interactive studio.

US 3
US 3 · UK F
14.07 mm · EU 44
US 4
US 4 · UK H½
14.88 mm · EU 47
US 5
US 5 · UK J½
15.69 mm · EU 49
US 6
US 6 · UK L½
16.51 mm · EU 52
US 7
US 7 · UK N½
17.32 mm · EU 54
US 8
US 8 · UK P½
18.13 mm · EU 57
US 9
US 9 · UK S
18.95 mm · EU 60
US 10
US 10 · UK U
19.76 mm · EU 62
US 11
US 11 · UK W
20.57 mm · EU 65
US 12
US 12 · UK Y
21.38 mm · EU 67
US 13
US 13 · UK —
22.20 mm · EU 70

Step 3: Cut-Out Paper Finger Ruler (0–85 mm Circumference Strip)

Don’t have a ring to measure? Cut along the dashed outline of the paper ruler below, make a small slit at Slot A (0 mm), wrap the strip snugly around the base of your finger (checking that it slides past your knuckle), and read the millimeter mark where it exits Slot A. Enter that exact millimeter circumference into our Paper Strip Ruler Studio.

✂ CUT ALONG DASHED BORDER · SLIT AT SLOT A (0 MM)ISO 8653 CIRCUMFERENCE (MM = EU SIZE)
SLOT A0 mm →010203040EU 4550EU 50EU 5560EU 60EU 6570EU 708085

Don’t have a printer or ruler nearby?

Calibrate your screen with any standard card in 10 seconds and measure directly on your display with 0.05 mm resolution.

Launch On-Screen Ring Sizer
ActualRingSize✦FINE JEWELRY METROLOGY

Calibrated 1:1 optical metrology studio for measuring ring inside diameters, watch lug-to-lug wrist presence, and GIA diamond millimeter geometry directly on screen.

No personal dataNo signup neededAlways free

1:1 Interactive Studios

  • Online Ring Sizer (1:1)
  • Watch Size & Lug-to-Lug Fit
  • Diamond Carat Size on Hand
  • International Ring Size Chart
  • Printable 1:1 Ring Sizer Sheet

Sizing Guides & Charts

  • How to Measure Ring Size at Home
  • Men’s & Women’s Ring Size Guide
  • Watch Case & Lug-to-Lug Guide
  • Diamond Carat to mm Chart
  • Sizing FAQ & Metrology Glossary

Company & Legal

  • About Us & ISO 8653 Methodology
  • Contact Us & Sizing Support
  • Privacy Policy
  • Terms & Conditions
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