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DIYSums team: We build free calculators that turn a DIY project into an exact shopping list. Quantities come from published product sizes and official guidance, so you buy the right amount first time.

DIYSums team is the publisher. The site is maintained by its team and does not assign the tools to an individual or claim professional credentials.

Tool pages explain their calculation method, identify source material and show a last-updated date where configured. That date describes the page update, it is not a promise that every supplier’s product or local rule remains unchanged.

No independent expert review is claimed. For structural, electrical, fire-safety or other regulated decisions, check the governing requirements and consult a suitably qualified professional.