The English-language version of Microsoft Office Visio comes with two sets of templates (template: A Visio file (drawing type) with a .vst extension that opens with the stencils, styles, and settings you need to create a particular type of drawing.): those that use US units (US units: Units used in the US measurement system, such as inches, feet, yards, and miles.) and those that use metric units. When you install Visio, the setup program checks your system and installs the templates that match it, either metric or US units. Non-English versions of Visio come with metric templates only.
If you want to create some drawings that use metric and some that use US units, install both sets of templates.
Install both US and metric templates
Then you can choose which units you want to use when you start a new drawing. For example, if you click File, point to New, and then point to Block Diagram, you can choose to open Basic Diagram (US units) or Basic Diagram (Metric).
If you only use shapes you've drawn yourself, instead of using shapes from Visio stencils, you can switch between units without installing both sets of templates.
On the Tools menu, click Options, and then click the Regional tab.Under Default units, choose Always offer 'Metric' and 'US units' for new blank drawings and stencils.
Note If you open a stencil after starting a drawing, be sure to open the version (metric units or US units) that matches the template you're working with. Mixing US units and metric units in the same drawing might result in misaligned shapes.