RingSizeCalculator

Measure your finger

Use a paper strip to measure the distance around your finger, then enter the length below.

Enter your finger circumference

  1. 1 Wrap the paper

    Wrap a narrow, non-stretch strip around your finger. Keep it snug without squeezing, and check that it passes your knuckle.

  2. 0Your mark

    2 Mark and measure

    Mark where the starting edge overlaps. Lay the strip flat and measure from that edge to your mark with a physical ruler.

  3. Circumference54.5mmExample measurement

    3 Enter the length

    Enter your measured circumference below and select the matching unit. Repeat the measurement to check your result.

Paper can bend, stretch, or compress skin. This is an estimate, not a professional fitting. Finger width on a screen is not circumference.

No account or photos needed. Measurements stay in your browser.Measurement guide →
Screen calibration

Calibrate your screen

On a phone, tablet, or computer, matching a bank card is the simplest way to set the scale.

Hold a standard ID-1 bank card upright against the screen. Adjust the outline to match its outside edges: 53.98 mm wide and 85.60 mm tall. Keep browser zoom unchanged.

Tap − or + for small adjustments, or drag the slider. No photos or card details needed.

Match your card53.98 mm ↔

On a short screen, scroll to check the edges. If your card cannot fit across the screen, use paper-strip measurement instead. Never shrink the outline just to make it fit.

Saved only in this browser.

Measure twice before choosing a size

Take a second measurement at a comfortable room temperature. The strip should be snug without squeezing, and the ring must still pass over your knuckle. If you fall between sizes, compare both fits.

Read the measurement guide →