How to Measure Your Ring Size (and Why Wide Rings Fit Differently)
Getting the right ring size is essential, especially if you're ordering a wide band. Here’s a simple guide to help you measure your finger and understand how sizing works for different ring widths.
Quick Overview
There are three common ways to measure your ring size:
- A paper strip or string
- A finger sizer
- Visit a Jeweller
Each method varies in accuracy. If visiting a local jeweller is an option for you, it’s the most reliable choice. If you're ordering a wide ring, make sure to read the last section too.
Paper Strip or String
Wrap a thin strip of paper or string around the base of your finger (not too tight). Mark where it overlaps, then measure that length with a ruler. Match the length in millimetres to an online size chart to find your ring size.
Buy a Finger Sizer
Plastic ring sizers, adjustable plastic gauges, or full sets of metal sizing rings are all affordable and more accurate than DIY methods. These tools are easy to find online and give you the flexibility to try different sizes or measure multiple fingers accurately at home.
Visit a Jeweller
The most reliable way to get your ring size is to have it measured with a metal ring gauge. These are the same tools professionals use and are especially important for wider rings. Be sure to tell your jeweller the width of the ring you're ordering—they’ll use the right tool for the job.
Ring Size Systems Around the World
Ring sizing systems vary depending on the country:
- US & Canada use numbers with half sizes (e.g. 7.5)
- UK & Australia use letters (e.g. M, P½)
- Europe uses millimetres of internal circumference (e.g. 54)
Always check which system a seller uses before placing an order.
How to Measure for Wide Rings
Wider rings feel tighter even if the size number is the same. This happens because they cover more of your finger and press closer to the knuckle, where fingers are slightly thicker and less flexible. That’s why most people need to go up in size for wide bands.
If your size was measured with a standard (narrow) sizer:
- For 8–12mm wide rings → add ½ size
- For 13–18mm wide rings → add 1 full size
Those with longer fingers may not need to size up for rings up to 12mm wide, and may only need to add half a size for rings 13–18mm wide—but it’s best to check using a wide ring gauge at your local jeweller if possible.
