How to Measure Your Ring Size

Finding your ring size at home is easier than you think. Here are three reliable methods to measure your finger for an accurate ring fit.

Method 1: String or Paper Strip

The most accessible method using items you have at home.

What You'll Need

  • A thin strip of paper or piece of string
  • A pen or marker
  • A ruler with millimeter markings
1

Wrap Around Your Finger

Wrap the string or paper strip around the base of your finger. It should be snug but comfortable — you need to be able to slide a ring over your knuckle.

2

Mark the Overlap

Mark where the strip overlaps to complete the circle. Make sure the mark is precise.

3

Measure the Length

Lay the strip flat and measure from the end to your mark in millimeters. This is your finger circumference.

Method 2: Existing Ring

If you have a ring that fits well, use it to find your size.

What You'll Need

  • A ring that fits the intended finger
  • A ruler with millimeter markings
1

Place Ring on Ruler

Place the ring on a flat surface. Position a ruler across the center of the ring's inner opening.

2

Measure Inner Diameter

Measure the inside diameter (the widest point of the inner circle) in millimeters. This is your ring's inner diameter.

Tip: To convert diameter to circumference, multiply by 3.14 (π). For example: 18mm diameter × 3.14 = 56.5mm circumference.

Method 3: Printable Ring Sizer

Many jewelry stores offer free printable ring sizers online. These provide pre-marked measurements for easy reading.

Important: When printing a ring sizer, make sure to print at 100% scale (no scaling or "fit to page"). Use a ruler to verify the printed measurements are accurate.

Tips for Accurate Measurement

  • Measure multiple times — Take 3-4 measurements and use the average for best accuracy.
  • Measure the right finger — Ring sizes vary between fingers and hands. Measure the exact finger you'll wear the ring on.
  • Consider temperature — Fingers swell in heat and shrink in cold. Measure at room temperature.
  • Measure later in the day — Fingers are typically largest in the evening.
  • Account for knuckles — If you have large knuckles, measure both the knuckle and base of finger, then choose a size between the two.
  • Consider ring width — Wider bands (6mm+) need a slightly larger size than thin bands.

Ring Size Reference Chart

Use your circumference measurement to find your ring size in different systems:

Circumference (mm) US UK EU
48.0 4.5 I 48
50.0 5.5 K 50
52.0 6 L½ 52
54.0 7 N½ 54
56.0 7.5 O½ 56
58.0 8.5 Q½ 58
60.0 9 R½ 60
62.0 10 T½ 62

See our complete ring size conversion charts for more sizes.

When in Doubt

  • Go slightly larger — Rings can be resized down more easily than up.
  • Ask a jeweler — Many jewelry stores offer free ring sizing.
  • Order a ring sizer — Plastic or metal ring sizers are inexpensive and very accurate.