Open Units Of Measure
- Open Settings.
- Choose Entity Settings.
- Open Products and Pricing.
- Choose Units of Measure.

Units of Measure is grouped by quantity, weight, length, volume, and time. System units are locked, while safe custom units can be managed by admins.
Understand Unit Types
Add A Custom Unit
- Choose the correct unit type.
- Click Add Custom Unit.
- Enter a short code operators will understand.
- Enter a clear label.
- Choose the base unit.
- Enter the conversion factor to the base unit.
- Save and test the unit on a sample product.

The conversion factor tells Arcus how the custom unit relates to the base unit for that unit type.
Safe Change Rules
- Create a new unit when the old unit has the wrong meaning.
- Deactivate a unit when it should no longer be selected.
- Keep system units locked.
- Test products, kits, purchasing, orders, and shipping after adding a unit.
- Avoid ambiguous codes such as box when the business uses multiple box sizes.
Common Blocks
- Unit is locked: system units cannot be edited.
- Unit cannot be deleted: it may already be used. Deactivate it instead.
- Conversion is wrong: create a replacement unit and correct product setup intentionally.
- Shipping rates look wrong: check weight and dimension units on the product and package.
- Kit quantities look wrong: confirm component quantities use the expected unit.
Related Articles
Products and Pricing Settings
Manage pricing levels, categories, units, and adjustment rules together.
Product Setup
Create and maintain products that use units for quantity, dimensions, weight, and inventory.
Kits and Assemblies
Use component quantities and units safely when selling or building kits.
Shipping and Fulfillment Setup
Configure shipping behavior that depends on product dimensions and weight.

