Contact DIYSum
Questions about the website, a calculator, or something that looks incorrect are welcome.
Please do not send sensitive personal, financial or payment information. DIYSum does not need that information to help with calculator or website questions.
Calculator feedback
If you are reporting a calculation issue, include the calculator name, the values you entered and the result you expected. Do not include private or confidential information.
Project questions
DIYSum can explain how its calculators work, but it does not provide engineering, code, structural, installation or other professional project advice.