💍
Online Shopping
Buy rings confidently from international jewelers. Convert US sizes to UK, EU, or Asian standards instantly.
- •Avoid return shipping fees
- •Shop global brands
- •Verify vintage ring sizes
Find your perfect fit with our international ring size conversion chart. Includes a free printable sizer strip and diameter guide for accurate measurements at home.
US / Canada • US / Canada
ChartsPrintables.com
Check scale before use: Measure the bar below.
Scale Check: 50mm / 2 inches
(Accuracy depends on screen scaling. Print for exact size.)
| US / Canada | UK / Aus | Europe (ISO) | Japan / China | Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|---|
| 0 | - | - | - | 11.63 | 36.5 |
| 0.5 | A | - | - | 12.04 | 37.8 |
| 1 | B | - | 1 | 12.45 | 39.1 |
| 1.5 | C | - | - | 12.85 | 40.4 |
| 2 | D | 41.5 | 2 | 13.26 | 41.6 |
| 2.5 | E | 42.75 | 3 | 13.67 | 42.9 |
| 3 | F | 44 | 4 | 14.07 | 44.2 |
| 3.5 | G | 45.25 | 5 | 14.48 | 45.5 |
| 4 | H | 46.5 | 7 | 14.88 | 46.8 |
| 4.5 | I | 47.75 | 8 | 15.29 | 48.0 |
| 5 | J 1/2 | 49 | 9 | 15.70 | 49.3 |
| 5.5 | K 1/2 | 50.25 | 10 | 16.10 | 50.6 |
| 6 | L 1/2 | 51.5 | 11 | 16.51 | 51.9 |
| 6.5 | M 1/2 | 52.75 | 12 | 16.92 | 53.1 |
| 7 | N 1/2 | 54 | 13 | 17.32 | 54.4 |
| 7.5 | O 1/2 | 55.25 | 14 | 17.73 | 55.7 |
| 8 | P 1/2 | 56.5 | 15 | 18.14 | 57.0 |
| 8.5 | Q 1/2 | 57.75 | 16 | 18.54 | 58.3 |
| 9 | R 1/2 | 59 | 17 | 18.95 | 59.5 |
| 9.5 | S 1/2 | 60.25 | 18 | 19.35 | 60.8 |
| 10 | T 1/2 | 61.5 | 19 | 19.76 | 62.1 |
| 10.5 | U 1/2 | 62.75 | 20 | 20.17 | 63.4 |
| 11 | V 1/2 | 64 | 21 | 20.57 | 64.6 |
| 11.5 | W 1/2 | 65.25 | 22 | 20.98 | 65.9 |
| 12 | Y | 66.5 | 23 | 21.39 | 67.2 |
| 12.5 | Z | 67.75 | 24 | 21.79 | 68.5 |
| 13 | - | 69 | 25 | 22.20 | 69.7 |
| 13.5 | - | 70.25 | 26 | 22.61 | 71.0 |
| 14 | - | 71.5 | 27 | 23.01 | 72.3 |
CUT OUT • SIZER STRIP
Download PDF for actual printable sizer.
IMPORTANT: Print at 100% Scale (Do not select 'Fit to Page').
Generated by ChartsPrintables.com • Free to use and share
Sizes
29
Region
US / Canada
PDF SIZE
≈0KB
Quality
300 DPI
Get an accurate fit at home with these simple steps.
Print the chart at 100% scale (do not select 'Fit to Page'). Measure the 50mm scale bar to verify accuracy before sizing.
Cut out the sizer strip, cut the slot, and wrap it snugly around the base of your finger. Read the size where the line appears.
Place a ring that fits you well over the diameter circles on the chart (if available) or measure the inside diameter with a ruler.
Planning a surprise proposal or gift? Here's how to get the size without them knowing.
Press an existing ring (that fits the intended finger) firmly into a bar of soap to leave a clear impression. Measure the diameter of the impression.
Borrow a ring and trace the INSIDE circle onto a piece of paper. Be precise! Measure the diameter of your drawing.
Risky but effective! Gently wrap a piece of string or floss around their finger while they sleep. Mark the overlap point.
Place a ring over a standard US coin to estimate its size.
~17.9 mm
Size 7.5
~19.0 mm
Size 9
~21.2 mm
Size 11.5
~24.3 mm
Size 15.5
If your knuckle is significantly larger than the base of your finger, measure both. Choose a size in between so the ring slides over the knuckle but doesn't spin too loosely.
Fingers swell in heat and shrink in cold. Measure your finger at room temperature, preferably at the end of the day when they are largest.
Wide bands (6mm or more) fit tighter than thin bands. If you are buying a wide ring, order a half size larger than your normal measurement.
From proposals to projects, get the size right every time.
Buy rings confidently from international jewelers. Convert US sizes to UK, EU, or Asian standards instantly.
Determine a partner's or friend's ring size secretly by measuring one of their existing rings.
Create perfectly sized wire-wrapped or beaded rings. Essential reference for jewelry makers.
Understanding the difference between international ring sizing standards.
Uses a numerical scale (0-16) with quarter and half sizes. One of the most common global standards.
Uses an alphabetical scale (A-Z+6). Each letter represents a specific diameter increment.
Based on the inner circumference in millimeters (e.g., Size 50 = 50mm circumference). Very precise.
Uses a numerical scale different from the US system. Common in Asian markets.
More tools for precise measuring and conversion.
| Millimeters | Decimal (in) | Fraction (in) |
|---|---|---|
| 0.5 | 0.020 | 0 |
| 1 | 0.039 | 1/16 |
| 6.35 | 0.250 | 1/4 |
| 12.7 | 0.500 | 1/2 |
| 19 | 0.748 | 3/4 |
| 25.4 | 1.000 | 1 |
| 38.1 | 1.500 | 1 1/2 |
| 50.8 | 2.000 | 2 |
| 76.2 | 3.000 | 3 |
| 101.6 | 4.000 | 4 |
Convert millimeters to inches with decimals and fractions for woodworking and engineering.
View chart| Inches (fraction) | Inches (decimal) | Millimeters | Centimeters |
|---|---|---|---|
| 1/4" | 0.250 | 6.35 | 0.64 |
| 1/2" | 0.500 | 12.70 | 1.27 |
| 1" | 1.000 | 25.40 | 2.54 |
| 1 1/2" | 1.500 | 38.10 | 3.81 |
| 2" | 2.000 | 50.80 | 5.08 |
| 2 1/2" | 2.500 | 63.50 | 6.35 |
| 3" | 3.000 | 76.20 | 7.62 |
| 4" | 4.000 | 101.60 | 10.16 |
| 5" | 5.000 | 127.00 | 12.70 |
| 6" | 6.000 | 152.40 | 15.24 |
Imperial to metric conversions for hardware sizing and fabrication.
View chart| Fraction | Decimal | Percent |
|---|---|---|
| 1/64 | 0.0156 | 1.56% |
| 1/32 | 0.0313 | 3.13% |
| 1/16 | 0.0625 | 6.25% |
| 1/8 | 0.1250 | 12.5% |
| 3/16 | 0.1875 | 18.8% |
| 1/4 | 0.2500 | 25% |
| 5/16 | 0.3125 | 31.3% |
| 3/8 | 0.3750 | 37.5% |
| 1/2 | 0.5000 | 50% |
| 3/4 | 0.7500 | 75% |
Fractions from 1/64 to whole numbers for math education and precision cutting.
View chart| Number | Fraction | Decimal (in) | Millimeters |
|---|---|---|---|
| #80 | — | 0.0135 | 0.34 |
| #50 | — | 0.0700 | 1.78 |
| #52 | 1/16" | 0.0625 | 1.59 |
| #41 | 3/32" | 0.0938 | 2.38 |
| #22 | 5/32" | 0.1562 | 3.97 |
| #11 | 3/16" | 0.1875 | 4.76 |
| #7 | 13/64" | 0.2031 | 5.16 |
| — | — | 0.2570 | 6.53 |
| — | 3/8" | 0.3750 | 9.53 |
| — | 1/2" | 0.5000 | 12.70 |
Numbered, lettered, metric, and fractional drill bit reference.
View chartExplore more: Categories · Use Cases · All Charts
Answers to common questions about ring sizing and conversion.