Contact

Found a bug, an outdated rate, or want to suggest a calculator? We genuinely want to hear it.

What to include

• Reporting a calculation issue? Tell us which tool, what you entered, what you got, and what you expected — we'll investigate and note any correction on the tool's page.
• Suggesting a new calculator? Describe the project decision you're trying to make ("how many pavers for a patio") — the best tools come straight from these requests.
• Advertising or partnership inquiries? Please note ads never influence our formulas or data, and we don't do paid placements inside calculators.