Terms

By using OpenTools you agree to these terms. The calculators provide planning estimates to help you think through a task; they are not professional, engineering, building-code, or financial advice.

No warranty

Results depend entirely on the values you enter and on the assumptions stated on each tool. Accuracy for your specific project, material, supplier, or jurisdiction is not guaranteed. The site and its tools are provided “as is” without warranty of any kind.

Verify before you act

Before purchasing materials, signing a contract, or making a decision with cost or safety consequences, confirm quantities, prices, and suitability with the relevant supplier or a qualified professional.

External sources

Each tool links to references for transparency. Those third-party sites are not under our control, and we are not responsible for their content or accuracy.

Changes

We may add, change, or remove tools, data, and these terms at any time. Continued use after a change means you accept the updated terms.