What This Calculator Does
The Rectangular Carpet Cost Calculator gives you a fast estimate of how much it will cost to carpet a rectangular room. You provide the room's length, its width, and the price of the carpet per square metre — the tool multiplies them together to return the total floor area and the total cost. It works with any currency, since it simply uses the price figure you enter.
How to Use It
Measure your room along two adjacent walls to get the length and width in metres. Enter both values, then enter the carpet price per square metre as quoted by your supplier. Press calculate and you'll see the floor area and the full carpet cost. If your carpet is sold by the square yard or square foot, convert your measurements to the same unit first so everything matches.
The Formula Explained
The calculation has two simple steps. First it finds the floor area: $$\text{Area} = \text{Length} \times \text{Width}$$. Then it multiplies that area by the unit price: $$\text{Cost} = \text{Area} \times \text{Price per m}^2$$. Because both steps are direct multiplication, doubling any single input doubles the result.
Worked Example
Suppose a living room is 5 m long and 4 m wide, and the carpet costs 25 per square metre. The floor area is $$5 \times 4 = 20 \text{ m}^2.$$ The total cost is $$20 \times 25 = 500.$$ So carpeting that room would cost about 500 in your chosen currency, before any underlay, fitting or wastage allowance.
FAQ
Does the price include fitting? No — this is the material cost only. Add separate quotes for underlay, gripper rods and installation labour.
Should I add extra for wastage? Yes. Carpet is often bought from a fixed-width roll, so consider adding 5–10% extra, or use a roll-width calculator for a precise cut plan.
Can I use feet instead of metres? Yes, as long as both your dimensions and your price are in the same unit (e.g. feet and price per square foot), the result stays correct.
