Ring Size Converter: UK to US, EU and International Ring Size Chart with Measuring Guide

Buying a ring online — whether it's an engagement ring, wedding band, or a Pandora charm ring — is nerve-wracking when you're not sure about the size. Get it wrong and you're dealing with returns, resizing fees, or worse, a ruined surprise proposal.

The problem? Every country uses a different ring sizing system. The UK uses letters (L, M, N), the US uses numbers (6, 7, 8), Europe uses circumference in millimetres, and some brands have their own systems entirely.

Our free ring size converter translates between all major systems instantly. This guide explains every system, how to measure your ring size at home, and the complete conversion chart you'll need.

Ring Sizing Systems Explained

There are four main ring sizing systems used worldwide:

UK Ring Sizes (Letters)

The UK (and Australia, Ireland, New Zealand, and South Africa) uses an alphabetical system from A to Z+. Each letter corresponds to a specific inner circumference. Half sizes exist between letters (e.g., L½).

The most common UK women's sizes are L to P, and men's sizes are T to Z.

US Ring Sizes (Numbers)

The US (and Canada) uses a numerical system from 0 to 16, with half and quarter sizes. The most common US women's sizes are 5 to 8, and men's sizes are 8 to 12.

European Ring Sizes (Circumference in mm)

Europe uses the inner circumference in millimetres as the ring size. So a European size 52 means the inside of the ring measures 52 mm around. This is the most logical system — it's a direct measurement.

Diameter-Based Sizing

Some Asian countries and jewellers use the inner diameter in millimetres. This is simply the circumference divided by π (3.14159).

Complete UK to US Ring Size Conversion Chart

This is the chart everyone searches for. Bookmark it or use our ring size converter for instant lookups.

How to Measure Ring Size at Home

You don't need to visit a jeweller. Here are four reliable methods:

Method 1: Use an Existing Ring

This is the most accurate home method:

1. Find a ring that fits the correct finger perfectly
2. Place it on a ruler and measure the inside diameter in millimetres
3. Use our ring size converter to find your size from the diameter

Pro tip: Measure across the widest part of the inside of the ring, not the outside.

Method 2: The String/Paper Method

1. Cut a thin strip of paper or use a piece of string
2. Wrap it snugly around the base of the finger (not too tight, not too loose)
3. Mark where the paper/string overlaps
4. Measure the length in millimetres — this is the circumference
5. Use the conversion chart above to find your size

Important: Make sure the paper can slide over your knuckle. The ring needs to fit over the knuckle but sit snugly at the base.

Method 3: Print a Ring Sizer

Many jewellers offer printable ring sizers. Download one, print at 100% scale (no scaling), and place your existing ring over the circles to find the match. Always verify the scale is correct by measuring the ruler printed on the page.

Method 4: Visit a Jeweller

Most high street jewellers will measure your ring size for free using a set of metal ring gauges. This is the most accurate method and takes about 30 seconds.

Pandora Ring Size Guide

Pandora uses European sizing (inner circumference in mm). Their most popular sizes are 48–56. Here's how Pandora sizes map to UK and US:

Pandora tip: If you're between sizes, Pandora recommends going up to the larger size. Their rings tend to run slightly small.

Tips for Getting the Right Size

Measure at the Right Time

Fingers change size throughout the day and with temperature:

• Measure in the evening — fingers are slightly larger than in the morning
• Avoid measuring when cold — cold fingers shrink, giving a falsely small reading
• Avoid measuring after exercise — fingers swell temporarily
• Measure multiple times — take 3 readings on different days and use the average

Consider the Ring Width

Wider bands (over 6mm) fit tighter than thin bands. If you're buying a wide band, go up half a size from your measured size.

Dominant Hand Is Larger

Your dominant hand (usually right) is typically half a size larger than your non-dominant hand. Make sure you measure the correct hand.

Pregnancy and Weight Changes

Ring size can change with weight gain/loss, pregnancy, and even humidity. If you're buying for a special occasion months away, measure closer to the date.

Secret Ring Size Measuring (For Proposals)

Need to find out your partner's ring size without them knowing? Here are some sneaky methods:

• Borrow a ring they already wear — take it to a jeweller or trace the inside on paper
• Ask their friends or family — someone might already know
• Use the soap trick — press their ring into a bar of soap to get an impression, then measure the impression
• Compare to your own fingers — try their ring on your finger and mark where it sits, then get that finger measured
• Buy a ring sizer as a "gift" — say it's for a different piece of jewellery

If all else fails, most jewellers offer free resizing within 30 days. Buy the ring and resize after the proposal.

International Ring Size Systems

If you're buying from international retailers, here's what each country uses:

Try Our Free Ring Size Converter

Don't risk getting the wrong size. Our free ring size converter instantly converts between UK, US, European, and international ring sizes. Enter any size and get all the equivalents — plus the exact diameter and circumference in millimetres.

Perfect for online shopping, international purchases, and making sure that special ring fits perfectly.

Frequently Asked Questions

What is the average ring size for a woman in the UK?

The average UK women's ring size is M (US 6½, EU 50.3). Most women fall between L and P.

What is the average ring size for a man in the UK?

The average UK men's ring size is T (US 10, EU 57.6). Most men fall between R and V.

How do I convert US ring size to UK?

Use our converter or the chart above. For example, US size 7 = UK size N.

Do Pandora rings run small?

Pandora rings tend to run slightly small. If you're between sizes, go up to the next size. Their sizing uses European (circumference in mm) measurements.

Can rings be resized?

Most gold, silver, and platinum rings can be resized up or down by 1–2 sizes. Rings with stones all the way around (eternity rings) and tungsten/titanium rings usually cannot be resized.

Should I measure my ring size in the morning or evening?

Measure in the evening when fingers are at their largest. Avoid measuring when very cold or after exercise.