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Measure once,
buy the right
amount.

Type each room’s length, width and ceiling height. The calculator works out the floor, the walls less doors and windows, and the volume, room by room and in total.

Measure my roomsWhat you get

The home room dimension calculator

The worked example is four rooms upstairs with 8-foot ceilings. Nothing you type leaves this browser.

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What you get

Enrichment · Passion ProjectsFree

What you finish with
Floor space, perimeter, wall surface and volume for each room and the total, in square feet and square meters, with flooring, paint, baseboard and air figures. It prints as a summary to take to the store.
Who it is for
Homeowners and renters planning paint or flooring, families measuring for furniture, and students practicing measurement with real rooms.
Format
Browser calculator for a phone, tablet or computer, by touch or keyboard. Prints a summary; downloads a spreadsheet (.csv); export and import a file.
Access
Free. No account, no sign-in and nothing to install. Everything you type stays in this browser; nothing is sent to Caveat.
Where it lives
The Passion Projects space in Caveat Enrichment.
Support
Questions, a correction or a request: team@caveatacademic.com.

How to use it

  1. Measure wall to wall.
  2. Type length, width and ceiling.
  3. Count doors and windows.
  4. Check the door and window sizes.
  5. Take the printout shopping.

Measure my rooms

How the room is measured

Rectangles, perimeters and boxes.

The worked example: the main bedroomMain bedroom14 × 12.5 ft8-foot ceilingFloor175 sq ftlength × widthWalls424 sq ft53 ft around × 8Less openings352 sq ft2 doors, 2 windowsThe worked example: the main bedroomMain bedroom14 × 12.5 ft8-foot ceilingFloor175 sq ftlength × widthWalls424 sq ft53 ft around × 8Less openings352 sq ft2 doors, 2 windows
Floor is length times width; walls are the perimeter times the ceiling height, less each door and window.

Floor and walls

A rectangular floor is length times width. The walls unroll into one long strip as long as the perimeter and as tall as the ceiling; each door and window is cut out of it. An L-shaped room is two rectangles typed as two lines.

Buying from the figures

Flooring is sold by the square foot with about 10 percent extra for cuts and waste. A gallon of paint covers roughly 350 square feet, so two coats need twice the wall figure; the can’s label has the real coverage. Baseboard follows the perimeter less the door openings.

Sources

  1. National Institute of Standards and Technology. Unit conversion: square foot and square meter (nist.gov).
  2. U.S. Environmental Protection Agency. Guide to air cleaners in the home: room size (epa.gov).
  3. U.S. Department of Energy. Energy Saver: how room volume and insulation affect heating and cooling (energy.gov).
  4. U.S. Department of Housing and Urban Development. Healthy homes and home maintenance basics (hud.gov).

Figures for rectangular rooms; measure twice and check product coverage before buying. Your entries stay in this browser. Support: team@caveatacademic.com.