Room & Home Area Calculator
Calculate the floor area of any room — rectangular, L-shaped, triangular, or circular — in meters, feet, centimeters, or inches. Add multiple rooms to see your total home area and optional cost estimates.
Add a room
Please enter a room name.
No saved calculations yet
Whether you're ordering flooring, calculating paint coverage, planning furniture layout, or pricing tiling work, getting the area right saves money and prevents costly mistakes. This calculator handles rectangular, L-shaped, triangular, and circular rooms in any unit (metres, feet, centimetres, or inches), lets you subtract fixtures, and multiplies by a per-unit cost so you can get from measurements to material budget in one step.
Example
L-shaped living room: Section A: 6m × 4m = 24m² Section B: 3m × 2m = 6m² Total: 30m² Hardwood flooring at $45/m²: $1,350 With 10% waste factor: 33m² → $1,485
Area Formulas
Rectangle: Area = Length × Width L-shape: Area = Section A + Section B (each rectangular) Triangle: Area = 0.5 × Base × Height Circle: Area = π × Radius² With waste: Order quantity = Area × (1 + waste%) Material cost = Order quantity × Cost per unit
Why Add a Waste Factor
Flooring and tiling always require cuts — especially in L-shaped and irregular rooms. Standard waste factors: 10% for simple rectangular rooms with straight runs, 15% for diagonal or herringbone patterns, 20% for very irregular shapes. Always buy at least 10% extra; leftover material is useful for future repairs. Return policies for sealed boxes mean over-ordering is usually low-risk.
Frequently Asked Questions
How do I measure an L-shaped room?
Divide it into two rectangles. Measure each rectangle's length and width separately, then add the areas.
Do I subtract doors and windows from paint calculations?
For rough estimates, no — the offsets are small and allow for errors. For precise orders, subtract window and door areas from wall square footage.
What's the difference between area and perimeter?
Area (m²) tells you how much material covers the floor or wall. Perimeter (m) tells you the total length of edges — needed for skirting boards or border tiles.
How do I calculate paint needed?
One litre covers about 10–12m² with one coat. Divide your wall area by 10 for the litres needed per coat, then multiply by coats (usually 2).