50 Specialist Calculators
Instant Results - No Sign-Up
Free to Use
Professional tools for serious builders

A new patio or deck is one of the most popular garden projects in the UK - transforming an outdoor space and adding usable living area to any home. Whether you are laying natural stone flags, concrete paving slabs or softwood decking boards, getting the material quantities right from the start avoids expensive over-ordering and multiple builder's merchant trips. The sub-base is often the most under-estimated element: a properly prepared MOT Type 1 or hardcore bed is what determines how long your patio lasts, so it is critical to calculate the compacted volume correctly.

This project kit walks you through every material stage in the right order - from paving quantities and sub-base aggregate through to edging haunching concrete, jointing sand and any adhesive or pointing mortar. Enter your patio or deck dimensions once and every calculator in the checklist opens pre-loaded with your measurements. Your progress saves automatically so you can work through each step at your own pace.

What this kit covers

Work through these 5 calculators in order. Each one uses your patio or deck dimensions to pre-fill the key inputs - just refine the details and save each result to your project.

1
Paving & Decking Calculator
Calculate the number of paving slabs or deck boards needed for your area, including cutting waste and pattern allowances.
Open calculator
2
Aggregate & Ballast
Work out the MOT Type 1 or hardcore sub-base quantities and sharp sand bedding layer for laying slabs or decking footings.
Open calculator
3
Concrete Volume
Calculate concrete for any edging haunching, post footings or step foundations within your patio project.
Open calculator
4
Gravel & Stone
If using gravel borders, decorative stone or jointing sand, calculate the tonnes or bags needed.
Open calculator
5
Adhesive & Grout
Calculate paving adhesive or pointing mortar quantities for bedding and jointing the slabs.
Open calculator

Start this project

Enter your patio or deck dimensions and we'll create a project with pre-filled starting points for each calculator.

Typically 100-150mm for patios, 200mm for driveways

Saves to My Projects. Free accounts get 1 project - go Pro for unlimited.

No free project slots

Your free account is limited to 1 saved project. To start this kit you can delete an existing project to free up a slot, or upgrade to Pro for unlimited projects.

Delete this project? This cannot be undone.