Click Manage tab › Settings panel › Project Units (UN). Click the Format value next to Length, pick the units and rounding, and click OK twice. Only the display changes, and dimension types or schedule fields with their own format don't follow.
Or, just ask Mira, a free add-in, to set length units and rounding, then read them back.
How to do it in Revit
Step 1: Open Project Units
Click Manage tab › Settings panel › Project Units (UN) (Autodesk Help: Set Project Units). A new project takes its units from the template it starts from.
Step 2: Pick a discipline and unit type
Choose a Discipline, such as Common, then click the button in the Format column next to Length. Area, Volume, Angle, Slope and the rest each have their own format, with a preview of how values will read.
Step 3: Set the units and rounding
In the Format dialog, pick Units, such as Feet and fractional inches or Millimeters, then a Rounding value. Choose Custom to type your own Rounding increment.
Step 4: Choose the symbol and display options
Set Unit symbol, then tick what you need: Suppress trailing 0's, Suppress 0 feet, Show + for positive values, Use digit grouping, or Suppress spaces, which shows 1' - 2" as 1'-2". Click OK twice.
Step 5: Set the decimal symbol
For decimal units, pick a Decimal symbol/digit grouping option in the Project Units dialog, then tick Use digit grouping in each format that should use it (Autodesk Help: Change Decimal Display and Digit Grouping).
Step 6: Give a dimension type its own units
Select a dimension, click Edit Type and click the Units Format button. Clear Use project settings and set its units and rounding, and every dimension of that type stops following Project Units (Autodesk Help: Create Custom Dimension Units).
Step 7: Check schedule fields
In a schedule's Schedule Properties, open the Formatting tab, select a numeric field and click Field Format. A field with Use project settings cleared keeps its own format, so tick it to follow Project Units again (Autodesk Help: Format a Schedule).
What to watch for
Units change the display, not the model. Switch from feet to millimeters and a 10'-0" wall reads 3048 mm. Nothing moves or resizes.
Type names don't convert. Change a project to metric and a wall type called 4" Masonry keeps its name. Rename types whose names carry a size, or tags and schedules will show inches while the dimensions show millimeters.
Editing can show more precision. Round dimensions to 1" and a value may still show fractions when you click it to edit, because Revit edits the true length, not the rounded one.
Plans and details can round differently. A dimension type with its own Units Format can show 1/8" in plans and 1/32" in details, Autodesk's own example. See how to add dimensions.
DWG exports have their own units. A DWG export uses its setup's One DWG unit is setting, inches by default in imperial projects, not Project Units. See how to export Revit to CAD.
Units drift between projects. One team rounds to 1/8", another to 1/256", and a consultant's model arrives in millimeters, so the same detail reads differently from one project to the next. Each one gets fixed by hand, often after a reviewer spots it. Setting units once in the template your firm standards start from means new projects begin right.
Or, just ask Mira to do it.
Mira is an AI thinking partner for Revit that automates the work you repeat and builds tools your team needs.
- Type this in Mira
Set this project's length units to feet and fractional inches, rounded to the nearest 1/8".
Mira reads the current Length format and lists the dimension types that don't use project settings, since those won't follow the change, and asks before it touches them. It sets the format in one step through a small tool it writes, which asks Allow first, and reads it back.
How do I change units in Revit?
How do I change Revit from metric to imperial?
How do I change dimension units in Revit?
Why didn't my dimensions change when I changed project units?
How do I change the rounding of dimensions in Revit?
What is the shortcut for project units in Revit?
Related Revit how-tos
- How to Scale in Revit: Views, Images and FamiliesPick a view's scale from the scale list on the View Control Bar. To resize lines, images or imported CAD, select them, click Scale (RE) on the ribbon, then pick two points or type a factor. Families can't be scaled; change their size parameters instead. Or, just ask Mira, a free add-in, to list drafting views off your standard scales.
- How to Add Levels in RevitIn a section or elevation, click Architecture tab › Datum panel › Level (LL). Click twice to draw the level line, then click its elevation and type the height. With Make Plan View on, each new level gets a floor plan and ceiling plan. Or, just ask Mira, a free add-in, to add levels, each with its own floor plan.
- How to Export Revit to CAD (DWG)Click File tab › Export › CAD Formats › DWG. Pick an export setup, choose the current view or a set of views and sheets, and click Next. Pick a folder, the AutoCAD version and the naming, and click OK. The setup decides layers and units. Or, just ask Mira, a free add-in, to export every floor plan to DWG.
- How to Install and Manage Revit PluginsInstall a Revit plugin, or add-in, from Autodesk's Design and Make Marketplace or its maker's installer, then start Revit. Its tools appear on the Add-Ins tab or its own tab. Turn add-ins off in Add-Ins Manager on the Manage tab (2025.3 and later). Or, just ask Mira, a free add-in, to replace a product name in every text note.
- Revit Keyboard Shortcuts: The Keys Worth Learning FirstMost Revit shortcuts are two-letter codes you type in sequence, such as WA for Wall or DI for Aligned Dimension, and Revit runs the tool on the last key. You change them in the Keyboard Shortcuts dialog (KS). The ones worth learning first are below, grouped by job. Or, for jobs no shortcut covers, like renumbering details, just ask Mira.
- Revit Project Browser Missing? How to Get It BackClick View tab › Windows panel › User Interface and tick Project Browser, and Properties if that's gone too. You can also right-click in the drawing area and choose Browsers › Project Browser. If it's ticked and you still can't see it, it's probably on another monitor or off-screen; the reset steps are below. Or, just ask Mira, a free add-in, why your Project Browser is empty.
Try it yourself.
Or bring it to the firm.
The download is free and takes a minute. The firm conversation is where your standards, your library, and your rollout get built. Start wherever makes sense.