SketchUp Square Footage: How to Calculate Floor Area and Wall Area

To get the floor area of a room in SketchUp, select its floor face and read the Area line in Entity Info; to total several rooms, Shift-click all the floor faces and read the sum in the same panel. Wall area works the same way on the wall faces, except that openings and group boundaries change what you are really selecting, which is where most wrong numbers come from.

Measure one face

With the Select tool, click the face (not a group around it) and open Entity Info. A 2015 forum answer lists the options: Entity Info shows the area when the selection is one or more faces, the Query tool shows it when you hover over a face, and the Area item of the context menu works on a single face or a multiple selection (SketchUp forum). The help page describes that context-menu item as calculating “the total surface area of a Selection, specific Tags in the selection, or applied Materials in the selection” (SketchUp help).

The figure is in the units of the model. To read square feet, set the model units to Architectural or Decimal Feet; a moderator gave that advice for LayOut labels in 2025 (SketchUp forum).

Get the total of several rooms

1. Click the first floor face, then Shift-click the others; Entity Info then reads the combined area (SketchUp forum).
2. Keep the faces in one drawing context. One reply says the method works only for surfaces in the same context, so faces inside different groups cannot be selected together from outside (SketchUp forum).
3. Complex shapes with many edges are hard to pick without catching edges; a poster called it a daunting task in the same thread. Turning the edges off, as another reply suggested, makes the faces easier to click.

This gives one total, not a list. If you need the three rooms as three numbers, select and note them one at a time.

Area of a material instead of a selection

Paint each room’s floor with its own material, then right-click the material (in the model or in the Materials panel), choose Area > Material and read the dialog, which gives the total area of the faces that carry it (SketchUp help). It reaches faces inside groups too: a forum reply suggested exactly that when faces were locked in separate groups (SketchUp forum). The catch is that every face with that material counts. In a 2017 thread a user got almost three times the area by material that he got by selection, and another poster explained that one figure counted all the faces and the other only three (SketchUp forum). Use a material that exists only on the surfaces you want.

Wall area

Measure a wall the same way, face by face, but decide first what you mean:

• Visible wall face. A face with the window cut through it is smaller than the full rectangle, and the face you select gives the area that remains. If a pane or infill face covers the hole, it is a separate face and is not part of the wall.
• Gross wall. Perimeter multiplied by height, which is what you get if you treat the wall as a solid rectangle. Subtract each opening yourself.
• Net wall for paint or plaster. Gross wall minus openings, face by face; add reveals only if the finish goes there.

Traps that give wrong numbers

• Selecting a group. After grouping, Entity Info stopped showing area for one user; the answer was that you must select at least one face, and selecting a group is not the same (SketchUp forum, January 2025). Open the group first.
• Scaled components. The Ruby documentation says a face’s area comes back unscaled unless the parent group’s transformation is applied (SketchUp Ruby API). Check a scaled room or wall against a hand calculation before trusting it.
• Counting too many faces. A room built as a solid has an inner and an outer face on each wall; select only the faces that belong to the surface you are measuring.
• Loose faces and groups mixed. One total only covers what you selected in one context; a room modeled as a group and a floor left loose at the root need separate readings.
• No per-room summary. In October 2025 users were still asking for Entity Info to report the combined area of selected faces and the total length of selected edges in a more useful way (SketchUp forum); do not expect a room-by-room list from it.

From readings to a room-by-room table

Note each room’s numbers in a spreadsheet with one row per room, then sum the columns. The table below is an illustration with invented rooms and a 2.5 m ceiling; it is not a measured model. Floor is length × width (5.0 × 4.0 = 20.00). Gross wall is the perimeter times height (2 × (5.0 + 4.0) × 2.5 = 45.00). Openings are the windows and doors in that room (living room: 1.5 × 1.2 + 0.9 × 2.1 = 1.80 + 1.89 = 3.69), and net wall is gross minus openings (45.00 − 3.69 = 41.31).

Room (m)	Floor (m²)	Wall, gross (m²)	Openings (m²)	Wall, net (m²)
Living room 5.0 × 4.0	20.00	45.00	3.69	41.31
Bedroom 4.0 × 3.5	14.00	37.50	3.33	34.17
Bathroom 2.5 × 2.0	5.00	22.50	2.25	20.25
Total	39.00	105.00	9.27	95.73

Floor total 20.00 + 14.00 + 5.00 = 39.00 m², which is about 419.8 ft² (39.00 × 10.7639). Net wall 41.31 + 34.17 + 20.25 = 95.73 m², which is also 105.00 − 9.27, about 1,030.4 ft². Keep the sum as a spreadsheet formula so a changed room updates the totals, and note the date and the model version next to it, because the numbers are a snapshot.

LayOut and labels

For a plan sheet, one forum reply says LayOut can show the area of faces from the model through labels (SketchUp forum, May 2025). I did not test the label settings, so the exact steps are left to the LayOut help pages.

What a spreadsheet-style takeoff adds

The manual route measures faces one reading at a time. SheetUp (SketchUp 2022 and newer, English interface) keeps one table instead: you add rows for an object, a tag, a material or a custom line, and each row reads a measure from the model, with a selection shortcut (From selection) to tick the objects you picked. Rows re-measure about a second and a half after the model changes, and the table is stored in the .skp.

• Material row. Surface area of every face painted with the material, including loose faces at the model root. A floor drawn as a single loose face is invisible to Object and Tag rows; only a Material row sees it. Unpainted faces show under Not Assigned.
• Object row. Surface area is the sum of all faces of the object, one side each. A room built as a group of faces works for Surface area, but Volume is only an estimate.
• Area (W×H). The outline of a closed solid wall seen face-on, with openings cut through it deducted. For a 4 × 3 m wall, 0.2 m thick, with one 1 × 1 m opening, that is 11 m² each, so 22 m² for two such walls; Surface area on the same wall also counts the reveal faces. Open shapes use their bounding rectangle, nothing is deducted. It is one side of the wall, so a partition shared by two rooms needs its own decision.
• Tag row. Count, Surface area, Volume and Area (W×H) summed over the components on the tag.

Limits that matter here: the sheet has no grand total of area or volume, only money (Subtotal, Waste, Tax, Total). Totals of area per tag or per material come from a Tag or Material row, or from filtering and summing the exported Excel sheet; add a row per room if you want the table as above. Loose edges and curves have no measure at all. Export gives one Excel sheet with live formulas for the costs, CSV (values only) or an HTML report; adding, viewing, editing and pricing rows is unlimited, and each saved file uses one of a limited number of free exports per day. For the wider picture of area meanings, see SketchUp surface area calculation; for per-material quantities see SketchUp material quantities; for the hand-off to a spreadsheet see exporting a material list to Excel.

What I could not check

• What Entity Info shows for a face inside a component that has been scaled; only the Ruby documentation was read, and it speaks of the API.
• Whether the area of a face with a hole cut through it excludes the hole in every case; this follows from the geometry but I did not test it.
• Front-versus-back counting for Area > Material; the help page does not say.
• The LayOut label steps; the forum reply names the idea only.
• Whether the Area command of the context menu differs between Windows and Mac versions; the help page was not read to the end.
• A group that holds only edges in SheetUp: I expect “not found” with quantity 0, but did not confirm it.

Sources

• SketchUp help: Calculating material area; Context menu items (entities)
• Forum: Is there a square foot calculator? (2015 to 2017); No area info after grouping (January 2025); Extension to automatically calculate area of multiple surfaces? (2019, 2023); Option in LayOut that automatically calculates square feet (May and June 2025); Entity Info upgrade (October 2025)
• SketchUp Ruby API: Face
• SheetUp behaviour: read from the extension’s documentation and source, 2026-11-10.

FAQ

Can SketchUp calculate square footage?
Yes, for faces. Entity Info shows the area of a selected face, and when you select several faces it shows their combined area (SketchUp forum). The unit follows the model units, so set Architectural or Decimal Feet to read square feet (SketchUp forum).

Why does Entity Info show no area after I group the faces?
Because the selection is now a group, not a face. A SketchUp forum moderator put it this way in January 2025: to display area you must select at least one face, and selecting a group is not the same (SketchUp forum). Open the group for editing and select the faces inside.

Is there a square footage calculator inside SketchUp?
Not a separate one. In a 2015 thread the answers were Entity Info, the Area command in the context menu, the Query tool (hover a face) and Area on a material in the Materials browser (SketchUp forum). For a table of many rooms, copy the numbers into a spreadsheet or use an extension.

How do I get the total area of several rooms?
Select all the floor faces that sit in the same drawing context and read the total in Entity Info (SketchUp forum), or paint them with one material and use Area > Material (SketchUp help). For a per-room table, record each room’s figure in a spreadsheet row and sum the column.