This pattern ruler – as with the other two pattern rulers – is metric rulers. Most of the western world, as well as in the developing countries, the metric measure is in use. As such, the pattern rulers are manufactured to cater for the larger world market.
We can supply you with a conversion sheet to use with a metric pattern ruler. We also have a magic metric tape measure that clips to the figure. The metric numbers on this tape measure indicate/ match up to, the metric size numbers to use on the pattern rulers.