Contact
Found a mistake, or want a calculator we don't have yet? We'd like to hear it.
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Needed before launch: a real contact email address
Reporting a mistake
Tell us which calculator, the numbers you entered, and what you expected to see.
If you have a source for the right figure, such as a data sheet or a supplier's spec, include it.
Suggesting a calculator
Tell us the project and what you need to know. The most-asked requests get built first.