Contact

Have a question about a guide or calculator, spotted a mistake, or want to ask about your membership or a store order? Send us a message and we will read it. Replies go to the email address you give, and we use it only to answer you (see the privacy policy).

Other ways to reach us

• Suggest a guide or tool: use the Suggest a Topic or Tool form.
• Find a store order: look it up with your order number and email.
• Your account or membership: manage them from your account page.
• Spotted something wrong on a page? Every guide and tool ends with a short “Was this page helpful?” question, and you can leave a note there.

Who we are

Engineer Underground is operated by Engineer Underground, LLC, in the Phoenix, Arizona area, and was started by Nick Peterson, a mechanical engineer. Read more about us, or see how we write and check our pages.