Calculating square metre size of your patio
To calculate the size of an L-shape or irregular shaped patio, the easiest way to do this is to break the space into separate rectangles.
For each rectangle, multiply the length by the width to give you a square metre size for that rectangle.
Once you’ve calculated the square metres for each rectangle, add those square metre amounts together to give you the total size of the patio in square metres (m²). See diagram below.
Work out the area of each “rectangle” by multiplying the length by the width, and then add them together to get your total area.
Patio Size Calculator
Enter width & length in metres or mm.
7800 mm = 7.8 m. We convert automatically when “mm” is selected.
Linear Metre Calculator
For edging/trims – calculates pieces including waste.
Sub-base Material Calculator
Estimate DTp1 / MOT Type 1 tonnage.
Formula: area × (depth/1000) × 2.12 (bulk density t/m³).
Bedding Mortar (5:1) Calculator
Estimates sharp sand & cement for a 50 mm bed.
Uses your factors: per 20 m² → ~1800 kg sharp sand & ~319.2 kg cement.
If you require breakdown of paving installation see our step-by-step guide on how to lay patio paving.
Or, if you need assistance regarding your patio installation, please don’t hesitate to contact us (01993 608 824) for free and friendly advice.