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Antique Ring Size Chart: MM, Inches, US, UK & EU Sizes + Free PDF


Antique Ring Size Chart: Sizes in MM, Inches, US, UK & EU

An antique ring size chart converts a finger or ring measurement into a ring size. Antique rings use the same US, UK and EU size scales as modern rings, but many were hand-made, worn thin or resized over the decades, so the size on a listing may not match the true fit. Use the chart below, then read the tips on measuring worn bands and resizing safely.

Quick answer: a US size 7 ring has an inner diameter of 17.32 mm (0.682 in) and an inner circumference of 54.4 mm, which is UK N½ and EU 54. For an antique ring, ask for the inner diameter in millimetres rather than relying on a size label.
Get the printable antique ring size chartFree A4 PDF with a 100% print-scale check. No sign-up needed.

Download the Antique Ring Size Chart PDF

How Antique Rings Are Sized

Antique rings are usually described as 100 years old or more, while vintage generally means at least 20 years. Whatever the age, a ring is sized by the inside diameter or circumference of its band. The ISO 8653 standard defines ring size by inside circumference in millimetres; see the ring size overview for background.

Antique pieces add a few complications. Many were made by hand before modern sizing standards, so a stated size can be approximate. Decades of wear can thin the shank or leave it slightly oval, and earlier resizing may have changed the ring. That is why a measurement in millimetres is more reliable than a size name.

Antique Ring Size Conversion Chart (MM, Inches, US, UK, EU)

Inner diameter is the width across the inside of the band. Inner circumference is the distance around it. Highlighted rows are common reference points.

Antique ring size conversion chart, US sizes 3 to 13
Ring size (US) Inner diameter (mm) Inner diameter (in) Inner circumference (mm) US UK EU
3 14.07 0.554 44.2 3 F 44
3.5 14.47 0.570 45.5 3.5 G 45
4 14.88 0.586 46.8 4 H 47
4.5 15.29 0.602 48.0 4.5 I 48
5 15.69 0.618 49.3 5 J½ 49
5.5 16.10 0.634 50.6 5.5 K½ 51
6 16.51 0.650 51.9 6 L½ 52
6.5 16.91 0.666 53.1 6.5 M½ 53
7 17.32 0.682 54.4 7 N½ 54
7.5 17.73 0.698 55.7 7.5 O½ 56
8 18.13 0.714 57.0 8 P½ 57
8.5 18.54 0.730 58.2 8.5 Q½ 58
9 18.95 0.746 59.5 9 R½ 60
9.5 19.35 0.762 60.8 9.5 S½ 61
10 19.76 0.778 62.1 10 T½ 62
10.5 20.16 0.794 63.3 10.5 U½ 63
11 20.57 0.810 64.6 11 V½ 65
11.5 20.98 0.826 65.9 11.5 W½ 66
12 21.38 0.842 67.2 12 X½ 67
12.5 21.79 0.858 68.5 12.5 Z 68
13 22.20 0.874 69.7 13 Z½ 70

Formulas used: circumference = π × diameter; inches = mm ÷ 25.4; EU size = inner circumference in mm, rounded. UK letters are matched to the nearest published inner diameter. Sizes vary slightly by maker, and antique rings may differ more.

Smaller Antique Ring Sizes

Many older rings turn up in smaller sizes, and a ring that looks dainty may sit around US 4 to 7. This is a general observation, not a rule, and hand sizes vary widely. Check the actual measurement instead of assuming.

Smaller antique ring sizes: US 4 to 7
Ring size (US) Inner diameter (mm) Inner diameter (in) Inner circumference (mm) US UK EU
4 14.88 0.586 46.8 4 H 47
4.5 15.29 0.602 48.0 4.5 I 48
5 15.69 0.618 49.3 5 J½ 49
5.5 16.10 0.634 50.6 5.5 K½ 51
6 16.51 0.650 51.9 6 L½ 52
6.5 16.91 0.666 53.1 6.5 M½ 53
7 17.32 0.682 54.4 7 N½ 54

Mid-Range Antique Ring Sizes

Sizes from about US 6 to 9 cover a large share of antique dress rings, bands and engagement rings. See also the women’s ring size chart.

Mid-range antique ring sizes: US 6 to 9
Ring size (US) Inner diameter (mm) Inner diameter (in) Inner circumference (mm) US UK EU
6 16.51 0.650 51.9 6 L½ 52
6.5 16.91 0.666 53.1 6.5 M½ 53
7 17.32 0.682 54.4 7 N½ 54
7.5 17.73 0.698 55.7 7.5 O½ 56
8 18.13 0.714 57.0 8 P½ 57
8.5 18.54 0.730 58.2 8.5 Q½ 58
9 18.95 0.746 59.5 9 R½ 60

Larger Antique Ring Sizes

Antique gents’ antique and band rings are commonly found from about US 8 to US 13. Larger rings are often heavier, which can make them feel snugger. See also the men’s ring size chart.

Larger antique ring sizes: US 8 to 13
Ring size (US) Inner diameter (mm) Inner diameter (in) Inner circumference (mm) US UK EU
8 18.13 0.714 57.0 8 P½ 57
8.5 18.54 0.730 58.2 8.5 Q½ 58
9 18.95 0.746 59.5 9 R½ 60
9.5 19.35 0.762 60.8 9.5 S½ 61
10 19.76 0.778 62.1 10 T½ 62
10.5 20.16 0.794 63.3 10.5 U½ 63
11 20.57 0.810 64.6 11 V½ 65
11.5 20.98 0.826 65.9 11.5 W½ 66
12 21.38 0.842 67.2 12 X½ 67
12.5 21.79 0.858 68.5 12.5 Z 68
13 22.20 0.874 69.7 13 Z½ 70

Worn and Oval Bands: Measure Two Ways

Round band versus worn oval antique bandOn the left a round band measures the same in every direction; on the right an antique band worn slightly oval measures wider in one direction, so two measurements are averaged. Round bandSame width both waysOne measurement is enough Worn, slightly ovalMeasure both directionsUse the average
A worn antique band can be slightly oval, so measure two directions and average the result.

If a band is out of round, one measurement can mislead. Measure the inside width across two directions about 90 degrees apart and average them. Very thin or distorted shanks may need a jeweller’s opinion before you wear the ring daily.

Antique ring fit factors
Factor What it can mean What to do
Hand-made band Stated size may be approximate Ask for inner diameter in mm
Thin, worn shank Fragile, may bend or break if forced Avoid stretching; ask a jeweller
Slightly oval shape One measurement may mislead Measure two ways and average
Earlier resizing Little metal left to adjust again Consider a ring guard instead

How to Measure Antique Ring Size in MM and Inches

Millimetres are the most accurate unit. Convert to inches by dividing by 25.4. Our how to measure your ring size guide and the ring size calculator cover more methods.

Measure an Existing Ring

Measuring the inner diameter of an antique ringAn antique ring with a gemstone seen from above, with a horizontal line across the inside edge to edge labelled inner diameter. Inner diameter 1. Measure two waysedge to edge, then turn 90°and average (worn bands warp). 2. Read it in mm.Inches = mm ÷ 25.4Example: 16.51 mm = 0.650 in
Measure the inside of the band edge to edge, then turn it and measure again.
  1. Choose a ring that fits the same finger comfortably, or the antique ring itself if you own it.
  2. Lay it flat and measure the inside width at its widest point, in mm.
  3. Measure again at about 90 degrees and average the two readings.
  4. Find the nearest value in the “Inner diameter (mm)” column.

Measure Finger Circumference with a Paper Strip

Measuring finger circumference with a paper stripA paper strip wrapped around a finger with a pen mark where the end overlaps, then laid flat against a ruler. 1. Wrap and mark 0mmmm Length 0 to mark = circumference 2. Lay flat and measure in mm
Wrap, mark, then measure the strip against a ruler.
  1. Cut a strip of paper about 10 mm wide and 150 mm long.
  2. Wrap it around the base of the finger and mark where it overlaps.
  3. Lay the strip flat and measure from the end to the mark in mm.
  4. Match the result to the “Inner circumference (mm)” column. Use string or a tape measure the same way.
Tip: measure at the end of the day when fingers are warm, and repeat three times. If your knuckle is larger than the base of your finger, choose a size that passes the knuckle.
Print the chart and check your sizeFree A4 PDF with a 100% print-scale check. No sign-up needed.

Download the Antique Ring Size Chart PDF

How to Choose the Right Antique Ring Size

  • Ask for millimetres. A stated size on an antique listing may be approximate.
  • Check condition. A thin, worn or previously resized band is fragile and may not tolerate changes.
  • Consider the band width. Wide or heavy bands can feel tighter; very thin bands can feel looser.
  • Check the knuckle. The ring must pass over it and still sit snugly.
  • Check the return policy. Buying antique rings online is easier when the seller accepts returns.

Can Antique Rings Be Resized?

Often, but it takes an experienced jeweller. Thin shanks, old solder, delicate or inset stones, engraving, hallmarks and enamel can limit resizing, and a poor job can reduce a ring’s value. Non-permanent options such as a ring guard or sizing beads are often used instead of cutting the band. Related guides: US ring size chart, UK ring size chart and ring size conversion chart.

Antique Ring Size FAQs

What size is an antique ring?

There is no single antique ring size. Antique rings come in many sizes, and many were made by hand before modern sizing standards, so the number stamped or listed may not match today’s US, UK or EU size exactly. Measure the finger and the ring, then match the measurement to the chart on this page.

Are antique ring sizes the same as modern ring sizes?

The scales are the same, but antique rings are often hand-finished, worn or previously resized, so the true inner diameter can differ from the stated size. Ask the seller for the inner diameter in millimetres, which is more reliable than a size label.

Why is my antique ring slightly oval?

Decades of wear, knocks and earlier repairs can leave a band slightly out of round. Measure the inside width in two directions and use the average, and have a jeweller check whether the shape is stable before you wear it daily.

Can an antique ring be resized?

Often it can, but it needs an experienced jeweller. Thin worn shanks, old solder, delicate settings, engraving, hallmarks, enamel and some older metals can limit resizing, and a heavy-handed change can reduce value or damage the ring. A jeweller should assess it first.

Should I size up or down for an antique ring?

If you are between sizes, many people go for the slightly larger one with a wide or heavy band and the slightly smaller one for a very thin, delicate band, but it varies. For a fragile ring, ask a jeweller rather than forcing a fit.

How do I measure my finger for an antique ring?

Wrap a strip of paper around the base of your finger, mark the overlap and measure the length in millimetres. Match that circumference to the chart. Measure the finger at the end of the day and repeat three times.

What can I do if an antique ring is a little loose?

Non-permanent options such as a ring guard or sizing beads are often used so the original shank is not cut. A jeweller can advise on whether a permanent change is safe for that particular ring.

Does antique ring size affect its value?

Resizing can affect value, particularly for rare or well-preserved pieces, because it can alter the original shank or remove hallmarks. If a ring may be valuable, get a valuation or specialist opinion before altering it.

Related Ring Size Guides

Download your free antique ring size chartFree A4 PDF with a 100% print-scale check. No sign-up needed.

Download the Antique Ring Size Chart PDF

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