Terms of Use

Estimates only

All calculator results are estimates for general planning purposes. They are not engineering, structural, building-control, fire-safety or other professional advice.

Verify before purchase or work

You are responsible for checking dimensions, product specifications, manufacturer instructions, regulations and professional requirements relevant to your project.

Availability

We aim to keep the site useful and accurate but do not guarantee uninterrupted access or that every result will suit every project.

Last updated: 24 August 2026.