Square Footage Calculator
Measure floor area, convert between units and estimate material cost.
Bare area for a rectangle. Add wastage for flooring or tiling, and split irregular rooms into rectangles.
Area, the foundation of any estimate
For a rectangular space, area is simply length times width. That single figure drives almost every material estimate — flooring, tiling, carpet, paint and turf are all priced by the square metre or square foot.
area = length × width · perimeter = 2 × (length + width)
Because materials are sold in both metric and imperial units, the calculator shows the area in the other system too, and adds an optional cost so you can price a job as you measure it.
A room 5 m by 4 m is 20 m² — about 215 square feet — with an 18 m perimeter. At $30 per square metre, the flooring would cost around $600 before any wastage.
Measuring with confidence
Accurate area starts with accurate measuring. Measure at floor level, take the longest points, and split complex rooms into simple rectangles you can add together. A small over-estimate is usually safer than coming up short on materials.
Handy reminders
- One m² ≈ 10.76 ft². Match the unit your supplier quotes.
- Add wastage. Around 10% for flooring; more for patterns and diagonals.
- Perimeter for trims. Skirting and edging are sold by length, not area.