About DIY Material Calc

DIY Material Calc provides fast, accurate calculators for DIY materials based on sourced data from UK manufacturers and suppliers.

Our approach

Every constant we use—bag yields, coverage rates, board sizes, joist spacing—comes from a primary source with a verified URL and check date. We show you the formula and source for every calculation.

Our calculations include manufacturer-recommended waste allowances so you don't run short. All estimates are for ordering materials, not structural design. For structural work, always check building regulations and consult a qualified professional.

Sources

We use data from:

• Tarmac Blue Circle (concrete and Postcrete)
• British Gypsum (plasterboard)
• Wickes, B&Q, and Travis Perkins (product specifications)
• TDCA Code of Practice (decking standards)
• Heidelberg Materials UK (concrete guidance)

All sources were verified on 26 October 2026.

Contact

For questions or corrections, visit our contact page.