Go to the System → Localization → Length classes
Units of measure to use in product options and shipping by product dimensions OR add new lengths, for example, if you sell your products using meters yards.
| Warning |
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Only one Base Length Class may have value 1 (1.000000) Others classes should be set with respect to Base class. The class set to 1.00000 is your base length (dimensions) class. Any other length classes in there need to be a factor of your base class. So when you add dimensions in any units to your product it will be re-calculated |
Default length classes cannot be edited or removed from the system. You can add your own classes specific to your country or business