Finding the right ring size is one of the most important steps when buying a ring online. A ring that's too tight is uncomfortable, and one that's too loose can slip off. The good news is that you can get a reliable idea of your size at home with a few simple methods. Here's our step-by-step guide.
How UK ring sizes work
In the UK, ring sizes are given as letters, running from A (the smallest) through to Z and beyond, with half sizes in between, such as M½. Each letter represents a slightly larger inside circumference. Many of our rings and bands are offered across a wide range of sizes; for example, our Aries Band is available in UK sizes H to Z. Always check the size options on the product page you're interested in.
Method 1: Measure a ring you already own
This is the most reliable home method, as long as the ring fits the finger you're buying for.
- Choose a ring that fits comfortably on the correct finger.
- Place it on a ruler and measure the inside diameter in millimetres, from inner edge to inner edge.
- Compare your measurement with a UK ring size chart to find the matching letter.
Tip: measure the inside edge, not the outside, and take the measurement across the widest point.
Method 2: The string or paper method
- Cut a thin strip of paper or a piece of non-stretchy string.
- Wrap it around the base of your finger, snug but not tight.
- Mark where the end overlaps.
- Lay it flat and measure the length in millimetres. This is your finger's circumference.
- Compare it with a UK ring size chart.
Make sure the string will slide over your knuckle. If it won't, you'll need a slightly larger size.
Tips for an accurate result
- Measure at the end of the day. Fingers are often slightly larger later in the day.
- Avoid extremes of temperature. Fingers shrink in the cold and swell in the heat.
- Measure more than once. Take three or four measurements on different days if you can.
- Consider your knuckle. If your knuckle is wider than the base of your finger, choose a size that slides over the knuckle comfortably.
- Wide bands fit tighter. A wider band covers more of the finger and can feel snugger than a slim ring in the same size, so you may want to go up half a size.
- Your dominant hand may be slightly larger. Measure the hand you'll actually wear the ring on.
Buying a ring as a surprise?
Planning a proposal without giving the game away can be tricky. A few ideas:
- Borrow a ring they already wear on the correct finger and measure it using Method 1, then return it before it's missed.
- Press a ring they wear into a bar of soap or a piece of modelling clay to make an impression of the inside.
- Ask a trusted friend or family member who may know their size.
If you're unsure between two sizes, it's generally better to choose the slightly larger one.
Made-to-order rings and bands
Many of our pieces are made to order in your chosen size, with production times of up to six weeks. Because they are made especially for you, it's worth taking extra care to confirm your size before ordering. If you have any questions, contact us before you buy.
Need resizing?
We provide ring resizing, repairs and professional cleaning services. If a ring you already own no longer fits, visit us in Clydebank, Ayr or Irvine and our team will be happy to help. Find out more about our services in our FAQs.
Ready to find your ring?
Once you know your size, explore our lab-grown diamond rings, wedding bands and diamond bands. And if you'd prefer to try rings on in person, book an appointment or pop into one of our stores. John Stewart Jewellers has been a traditional family jeweller since 1988.
