Use this table to compare American (Imperial) to Metric sizes. Indigo magnets increment in multiples of 2.5mm (~1/10") to simplify prototyping. The few with 1mm thicknesses are the main exception.
    
        
American (Imperial)/Metric Conversion Table
| Inch | Decimal | mm | Rounded | 
|---|---|---|---|
| 1/32" | 0.031 | 0.8 | 1 | 
| 3/32" | 0.094 | 2.4 | 2.5 | 
| 5/32" | 0.156 | 4.0 | 4 | 
| 1/16" | 0.063 | 1.6 | 1.5 | 
| 3/16" | 0.188 | 4.8 | 5 | 
| 2/10" | 0.200 | 5.1 | 5 | 
| 1/8" | 0.125 | 3.2 | 3.75 | 
| 1/4" | 0.250 | 6.4 | 7.5 | 
| 5/16" | 0.313 | 7.9 | 7.5 | 
| 3/8" | 0.375 | 9.5 | 10 | 
| 13/32" | 0.406 | 10.3 | 10 | 
| 1/2" | 0.500 | 12.7 | 12.5 | 
| 9/16" | 0.563 | 14.3 | 15 | 
| 5/8" | 0.625 | 15.9 | 15 | 
| 11/16" | 0.688 | 17.5 | 17.5 | 
| 3/4" | 0.750 | 19.1 | 20 | 
| 13/16" | 0.813 | 20.6 | 20 | 
| 7/8" | 0.875 | 22.2 | 22.5 | 
| 15/16" | 0.938 | 23.8 | 25 |