Choose Your Preferred Method:
String & Ruler Method
What You'll Need:
- String, dental floss, or thin strip of paper (non-stretchy)
- Ruler or tape measure with millimeters (mm)
- Pen or marker
- Our size chart below
Circumference to Size Chart
| Circumference (mm) | UK Size | US Size | Diameter (mm) |
|---|---|---|---|
| 57-58 | P | 7.5 | 18.2 |
| 58-59 | Q | 8.5 | 16.8 |
| 59-61 | R | 9 | 19.0 |
| 61-62 | S | 9.5 | 19.4 |
| 62-63 | T | 10 | 19.8 |
| 63-64 | U | 10.5 | 20.2 |
| 64-65 | V | 11 | 20.6 |
| 65-67 | W | 11.5 | 20.0 |
| 67-68 | X | 12 | 21.4 |
| 68-69 | Y | 12.5 | 21.8 |
| 69-70 | Z | 13 | 22.2 |
Highlighted sizes are most popular for men
Measure an Existing Ring
What You'll Need:
- A ring that fits well
- Ruler with millimeter markings
- Good lighting
Inner Diameter to Size Chart
| Inner Diameter | UK Size | US Size | Best For |
|---|---|---|---|
| 17.7mm | N | 7 | Smaller hands |
| 18.2mm | P | 7.5 | |
| 19.0mm | R | 9 | Average men's |
| 19.4mm | S | 9.5 | Smaller hands |
| 19.8mm | T | 10 | Most popular |
| 20.2mm | U | 10.5 | Most popular |
| 20.6mm | V | 11 | |
| 21.0mm | W | 11.5 | Larger hands |
| 21.4mm | X | 12 | |
| 21.8mm | Y | 12.5 | |
| 22.2mm | Z | 13 |
Free Ring Sizer by Mail
What You'll Get:
A reusable plastic ring sizer with multiple sizes (P-Z+1). Simply slide the rings onto your finger until you find your perfect fit.
Why This Method is Best:
- Professional accuracy – the same tools jewelers use
- Feel the actual fit before you buy
- Account for knuckle size (common for men)
- Test different times of day
- Keep it for future purchases
Order Your Free Ring Sizer
Sizing Tips & Common Questions
Best time: Late afternoon or early evening
Why? Your fingers naturally swell slightly throughout the day due to temperature changes, physical activity, and water retention. Measuring in the evening ensures your ring won't feel too tight later.
Always go up to the larger size.
Here's why:
- A slightly loose ring is comfortable
- Rings can be sized down easily if needed
- Fingers swell in warm weather
- Tight rings can restrict blood flow
Most men wear rings on:
- Ring finger (left hand): Wedding/commitment rings
- Ring finger (right hand): Fashion/statement rings
- Middle finger: Bold statement rings
- Pinky finger: Signet rings (usually 2-3 sizes smaller)
Your dominant hand's fingers are often slightly larger due to increased blood flow.
Yes! Ring size can change due to:
- Weight gain/loss (even 5kg can affect finger size)
- Temperature (fingers swell in heat, shrink in cold)
- Aging (fingers can get thicker)
- Time of day (evening vs. morning)
- Exercise (temporary swelling)
- Sodium intake (causes water retention)