Contact DIYSums

Email hello@diysums.com to report a calculator issue, suggest a source correction or share an idea for a new calculator.

To help us check a problem, tell us the tool, the country version, the input values you used and the result you expected. For source corrections, include the relevant source link. Please do not include passwords, payment details or other sensitive personal information.

We cannot give advice about a specific project. For structural, electrical, planning or other regulated work, ask a suitably qualified professional or your local authority.