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Contact

Email [email protected]. Say which calculator or guide you mean, and what looked wrong.

We do not take design appointments through this address. Corrections to a worked example are welcome.

What to send

Write if a worked case on a page does not match the formula printed above it. Name the page, the inputs and the result you saw. Do not send a project model, a personal file, or a drawing for checking. This site does not review appointments and does not return a design.

The inbox is [email protected]. A message is ordinary correspondence. It is not a shared container and it has no CDE state.

What to write beside the result

A review can only check this figure if the inputs sit next to it. Write the value, the unit and the assumption the form used. A diameter in millimetres and a diameter in metres are not the same reading. A force in kilonewtons divided as if it were newtons is a thousand-fold error.

The result is the arithmetic on this page. It is not a utilisation, not a selected product, and not a clause from a standard. If the number is going into a shared container, name the page, the date and the inputs. The file-name checker does not read the calculation.