| Millimeters | Decimal Inches | Approximate Inches on a Ruler | Other equivalent measurements |
|---|
| 0.25mm | 0.010" | - | 30 gauge (Brown & Sharpe) |
| 0.3mm | 0.012" | - | - |
| 0.32mm | 0.013" | - | 28 gauge (Brown & Sharpe) |
| 0.36mm | 0.014" | - | - |
| 0.41mm | 0.016" | - | 26 gauge (Brown & Sharpe) |
| 0.46mm | 0.018" | - | - |
| 0.51mm | 0.020" | - | 24 gauge (Brown & Sharpe) |
| 0.64mm | 0.025" | - | 22 gauge (Brown & Sharpe) |
| 0.76mm | 0.030" | - | - |
| 0.81mm | 0.032" | 1/32 Inch | 20 gauge (Brown & Sharpe) |
| 1mm | 0.039" | - | 18 gauge (Brown & Sharpe) |
| 1.29mm | 0.051" | - | 16 gauge (Also about the thickness of a US dime) |
| 1.63mm | 0.064" | 1/16" | 14 gauge (Brown & Sharpe) |
| 2mm | 0.079" | - | 12 gauge (Also about the thickness of a US nickel) |
| 2.59mm | 0.102" | - | 10 gauge (Brown & Sharpe) |
| 3mm | 0.118" | A touch less than 1/8 inch | - |
| 4mm | 0.157" | - | - |
| 5mm | 0.197" | 3/16 Inch | - |
| 6mm | 0.236" | A little less than 1/4 Inch | - |
| 7mm | 0.276" | A little bit more than 1/4 Inch | About the diameter of a pencil |
| 8mm | 0.315" | 5/16 Inch | - |
| 9mm | 0.354" | A little less than 3/8 Inch | - |
| 10mm | 0.394" | A little bit more than 3/8 Inch | - |
| 11mm | 0.433" | 7/16 Inch | - |
| 12mm | 0.472" | A little less than 1/2 Inch | About the width of a standard staple |
| 13mm | 0.512" | A little bit more than 1/2 Inch | - |
| 14mm | 0.551" | 9/16 Inch | - |
| 15mm | 0.591" | A little less than 5/8 Inch | - |
| 16mm | 0.630" | 5/8 Inch | - |
| 17mm | 0.669" | A little less than 11/16 Inch | - |
| 18mm | 0.709" | A little less than 3/4 Inch | About the diameter of a US dime |
| 19mm | 0.748" | A little bit more than 3/4 Inch | About the diameter of a US penny |
| 20mm | 0.787" | A little less than 13/16 Inch | - |
| 21mm | 0.827" | A little bit more than 13/16 Inch | About the diameter of a US nickel |
| 22mm | 0.866" | A little less than 7/8 Inch | - |
| 23mm | 0.906" | A little bit more than 7/8 Inch | - |
| 24mm | 0.945" | 15/16 Inch | About the diameter of a US quarter |
| 25mm | 0.984" | 1 Inch | - |
