Inch to Millimeter Conversion Charts

Need to know what inch sizes your metric sockets or wrenches match up with? Or which metric sizes correspond with your standard inch tools? You might find that it's helpful to have these size conversions handy.

Inch to Millimeter Conversion Chart

Download PDF  |  Also available for sale as a Magnet or Waterproof Card



Inch to Millimeter Conversion Table

Download PDF  |  Also available for sale as a Magnet or Waterproof Card

Featured Tools


Combination Wrench Set, 38-Piece (1/4 - 1-1/4 in., 6-24 mm) - Rack
Combination Wrench Set, 30-Piece (1/4-1 in., 8-22 mm) - Holder Combination Wrench Set, 30-Piece (1/4-1 in., 8-22 mm) - Holder
Combination Wrench Set, 30-Piece (1/4-1 in., 8-22 mm) - Pouch Combination Wrench Set, 30-Piece (1/4-1 in., 8-22 mm) - Pouch
1/4 Inch Drive 6-Point Socket & Ratchet Set, 55-Piece (5/32-9/16 in., 4-14 mm) 1/4 Inch Drive 6-Point Socket & Ratchet Set, 55-Piece (5/32-9/16 in., 4-14 mm)
3/8 Inch Drive 6-Point Socket & Ratchet Set, 74-Piece (1/4-1 in., 6-24 mm) 3/8 Inch Drive 6-Point Socket & Ratchet Set, 74-Piece (1/4-1 in., 6-24 mm)
1/2 Inch Drive 6-Point Socket & Ratchet Set, 58-Piece (3/8-1 in., 10-24 mm) 1/2 Inch Drive 6-Point Socket & Ratchet Set, 58-Piece (3/8-1 in., 10-24 mm)