What do you need help with ?

We have provided some helpful easy to use product calculators to help you out with your next project. Just select a category below and follow the simple instructions and we’ll work out the quantity you require for the job. Easy!

Decking calculator

Bricks & blocks calculator

Decorative aggregates calculator

Floorboards calculator

Cladding calculator

Paving calculator


The results from these product calculators should only be used as a rough guide as exact conversions will depend largely on a number of factors that are beyond M&J Builders Merchants control. These vary from on site conditions such as: varying levels, moisture content of products, personal preference of desired amount of material to be used, individual’s percentage calculation of waste/damages and a number of further factors. M&J Builders Merchants cannot be held contractually responsible for any surplus or shortfall found on site. If in doubt speak to your M&J representative who can advise on individual requirements to a greater extent, however, the final decision of the amount of material required will ultimately be the customers' responsibility.