Room Area Calculator — floor area in square metres (m²)

Multiply the room's length by its width: area = length x width (in metres). The result is in square metres (m²). Example: a room 4.5 m x 3.2 m = 14.40 m².

PUM (Powierzchnia Uzytkowna Mieszkania — usable floor area) is the sum of all habitable rooms: living rooms, kitchen, bathroom, toilet and hallway. Balconies, loggias, terraces and utility rooms are usually excluded. Gross floor area may be higher if developers include a share of common areas. Always check exactly what the quoted m² figure covers in the sales listing.

Under the PN-ISO 9836 standard used by GUS, area is measured between finished wall surfaces (not in the axis of walls), so internal wall thickness is excluded. Alcoves and fitted wardrobes are included if their depth exceeds 20 cm.

Divide the L-shaped room into two rectangles, calculate the area of each and add the results. Example: rectangle 1 = 4 m x 5 m = 20 m², rectangle 2 = 2 m x 3 m = 6 m², total = 26 m². The calculator does this automatically when you select the L-shape mode.

According to GUS data, the average usable floor area of a dwelling in Poland is around 72-75 m² (existing stock). New completions average around 55-65 m². A studio is typically 20-35 m², a two-room flat 40-55 m², a three-room flat 55-75 m², and four rooms and above exceed 75 m².

Measure each room separately (length x width) and sum the results. Include the kitchen, bathroom, toilet, hallway and any pantry — all count towards PUM. The Whole apartment mode accepts up to 5 rooms and sums their areas automatically.

Finishing costs in Poland are roughly 800-2,000 PLN/m² (from developer standard to move-in ready), so for a 50 m² flat that is 40,000-100,000 PLN. Larger floor areas typically have a lower unit cost due to economies of scale when buying materials. The exact budget depends on finish quality, region and labour rates.

Not always. Developers measure at design stage and the actual area after construction can differ by 1-3%. The Polish Developer Act allows a tolerance of up to 2% without a price adjustment. Above that threshold the buyer has the right to a price correction or contract withdrawal. It is always worth commissioning an independent measurement at the key handover.

Use a laser distance meter or a steel tape measure. Measure at finished floor level between wall surfaces (not skirting board faces). For irregular rooms, divide the space into rectangles and add the areas. Round results to 0.01 m. Thick columns and pilasters should be subtracted from the measured area.

Balconies, loggias and terraces are normally excluded from PUM under PN-ISO 9836. Some developers quote a "total area" that includes 50% of the balcony or terrace. In property listings, always check whether the quoted m² is PUM or total area — the difference has a significant impact on the calculated price per m².