Paving Slab Calculator

Calculate exactly how many slabs you need for your new patio or path, factoring in the mortar joints and cutting waste.

Patio Dimensions & Slab Type

Results

Total Patio Area: 0.00 m²
Base Slabs (No waste): 0
Total Slabs to Order: (Includes 10% allowance) 0
Sizes given are nominal. Project packs with multiple slab sizes cannot be calculated this way.
Browse Paving Slabs at Wickes

Frequently Asked Questions

How big should the gap between patio slabs be?

For standard concrete or natural stone paving flags, a mortar joint gap of 10mm to 15mm is standard to allow for pointing and minor variations in slab size.

How much waste should I allow for paving?

It is highly recommended to add a 10% waste allowance. You will inevitably need to cut slabs for the edges or around drains, and breakages during transit or laying are common.

Can I lay paving slabs touching each other?

No, paving slabs should never be butt-jointed (touching). They will rub against each other and chip/spall the edges. Always leave a joint for pointing.

What goes under paving slabs?

A standard UK patio requires a compacted sub-base of MOT Type 1 aggregate (approx 100mm), topped with a full wet bed of sharp sand and cement mortar (approx 30-50mm) to lay the slabs onto.