A 4 m × 5 m room
4 × 5 = 20 m² for one room.
Square metre calculator
Calculate area from width, length and quantity.
Calculation details
Change the values to update the result instantly.
How it works
Calculate area from width, length and quantity. This free estimate is for planning purposes. Verify financial and tax decisions with a qualified professional.
How area is calculated
The calculator multiplies width by length by quantity: area = width × length × quantity.
Multiple identical rooms or panels
Set quantity to the number of identical spaces to get the combined area in one step, e.g. 4 × 5 × 3 = 60 m².
Irregular shapes
For shapes that are not simple rectangles, split them into rectangular sections and add the areas separately.
Frequently asked questions
How do I calculate area in square metres?
Multiply width by length. For several identical spaces, multiply the result by the quantity.
What about rooms that are not rectangular?
Split the space into rectangular sections, calculate each area separately, and add them together.
What does the square metre calculator calculate?
Calculate area from width, length and quantity.
Is this calculator free to use?
Yes. You can change the values and calculate as often as you need without creating an account.
How accurate is the result?
The result is an estimate based on the values you enter. Rates, fees, taxes and personal circumstances can change the final amount.