Measurement Tools

Rulers, converters, and sizing tools that work right in your browser.

Online Ruler

An accurate on-screen ruler in centimetres, inches, and pixels.
Crochet Hook Size Chart

Identify an unmarked hook by holding it against your screen, plus the full mm-to-US chart.
Knitting Needle Size Chart

Identify an unmarked needle against your screen, plus the full US-to-mm chart.
Beads Per Inch

How many beads fill an inch, plus a true-size gauge to identify what you have.
Sandpaper Grit Chart

CAMI, FEPA and JIS grits against actual particle size — including where they disagree.