Per-room area in square metres, calculated as you draw

Every room you trace returns its area in square metres the moment you close the polygon. There is no separate calculate step, no manual entry, no reaching for a calculator. AreaSum measures the polygon you drew at the scale you set, rounds it the way an estimator would (two decimals), and shows the number on the room itself so you can read it while you keep tracing.

The numbers stay live. Re-trace a room, drag a vertex, or apply a per-edge override and the area updates without a page reload. Totals at the bottom of the project follow the same rule: they are a sum of the rooms you can see, not a snapshot that drifts out of date.

Behind the live number is a standard surveyor’s polygon-area formula (the shoelace), applied to the vertices you placed at the scale you calibrated. That means it works for L-shapes, octagonal nooks, rooms with chimney breasts cut out, and any other geometry that does not fit a rectangle. The output is the same number a hand-takeoff with a scale ruler and a calculator would give — without the calculator step and without the arithmetic mistakes.

For estimators who quote off square metre coverage — carpet broadloom, multi-room carpet cut list, vinyl plank coverage, tile area — the per-room number is the number you put on the quote. You can read more about how the underlying calculation works in the flooring takeoff glossary entry.

Per-room totals also roll up by flooring type at the project level, so a residential job with carpet bedrooms, vinyl plank living and tile wet areas comes out as three subtotals on the quote — not one averaged number. That matches the way carpet retailers and home builders quote, and it is the missing structure most generic PDF-markup tools leave to you to add by hand.