UK DIY materials

Buy the right amount, first time.

Estimate concrete bags, deck boards and plasterboard sheets before you buy.

Concrete calculator

Cubic metres and bags for slabs, footings, round holes and fence posts.

Deck boards, joists and linear metres of timber, with TDCA span guidance.

Sheets for walls and ceilings using both layout and area methods.

For structural work, always check building regulations and consult a qualified professional.

Yields and sizes come from Tarmac Blue Circle, British Gypsum, Wickes and the TDCA Code of Practice.

Every result shows the formula and links to the source, so you can check it yourself.

Recommended waste allowances are built in so you don’t run short halfway through the job.