17 mm Inside Ring Diameter to US, EU, UK & JP

Interactive millimeter-calibrated 17 mm inside ring diameter to us, eu, uk & jp running locally in your browser (17 mm Inside Diameter).

Step 1 · Heel-to-Wall Foot Measurement

Stand barefoot on a sheet of paper with your heel lightly touching a wall. Mark the tip of your longest toe and measure in cm or mm.

Step 2 · Calibrate Once with Any Bank Card

Every standard payment card is strictly 85.60 mm wide worldwide. Matching your card to the blue rectangle makes your screen millimeter-accurate.

Step 3 · Match Ring Inside Wall Only

Thick rings look larger from the outside. Line up the red circle exclusively against the inner opening where your finger goes.