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Questions, corrections or ideas for a new calculator? We'd like to hear from you.

We usually reply within 2–3 business days.

What to include

Corrections: the page link, the number you think is wrong, and a source if you have one.
Calculator ideas: the project you'd like to estimate and what you'd want to enter.
Partnerships and advertising: your company name and a short description of your proposal.

We can't give quotes for specific jobs or recommend individual contractors.