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We read every message and usually reply within a few working days.
What to include
- Reporting an error? Tell us which calculator, the values you entered (and whether you used US or UK units), the result you got and what you expected.
- Suggesting a calculator? Describe the project and the measurements you would enter. Ideas from readers shape what we build next.
- Business or advertising enquiry? Put “Business” in the subject line.
We cannot give professional or structural advice for specific projects. For anything that affects the safety of a building, please consult a qualified professional or your local building control office.