Add up the usable internal area of a home room by room. Enter each room's length and width on its own line, and the tool totals the internal floor area and shows how much of it each room takes up. These results are approximations for general information only, not a survey, and they cover the rooms you list rather than walls, balconies or shared areas.
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How to Use the Floor Area Calculator
List each room on its own line as Room | Length | Width in metres and press Calculate. The tool multiplies length by width for each room, totals them and shows each room's share of the total.
Result notes
Total usable area is the sum of the room areas you entered.
The share of each room is its area divided by the total.
Rows with a missing, zero or negative dimension are skipped, so check the rooms counted.
Areas are in square metres.
Tips
Measure between finished walls and keep the same unit throughout. Use the shares to plan furniture, heating or rent splitting by usable space.
Features
Room-by-room area with a running total
Each room's share of the usable area
Metres in, square metres out
Reads your room list straight from the text box
All processing runs locally in your browser. Your data is not uploaded to any server.
These results are approximations for general information only and are not a survey or legal advice. Only the rooms you list are counted.