Physical screen sizing

Knuckle Imprint Size Guide

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This screen isn't big enough for the size calculator, please use a laptop or desktop

1:1 screen calibration

Calibrate once, then choose your size

Only one calibration method is required. Use the card by default, or use the ruler correction below instead if that is easier; either method saves the same screen scale.

Step 1Hold a card up to this screen overlapping the card on the right, then adjust the card width slider until the real card and screen card match. Use the ruler correction below instead only if you are not using a card.
Step 2Use the knuckle imprint below and save the smallest size that fits your hand.

85.6 mm standard card width

Adjust on-screen card width

Auto-saves as you drag Not calibrated yet

Optional ruler calibration

Use this instead of the card if you have a ruler handy. Drag the 5-inch bar until it matches a real ruler, or enter the width you actually see. Slider changes save automatically.

5.000 in

Adjust on-screen ruler width

Measured bar width in

Select a size to see its target width.

This chart is not 1:1 until screen calibration is saved. Browser default sizing can be off by more than an inch on high-density monitors.

Calibration check

1 inch

After calibration, this ruler and the imprint use the same measured screen scale. Hold your four knuckles to the imprint and choose the smallest size where each joint sits inside its circle.