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If a calculator gives you an answer that looks wrong, this is the fastest way to get it fixed: tell us which calculator, what you typed in, and what result you expected versus what you got. A specific example ("mortgage calculator, $250,000 at 6.5% for 30 years, expected about $1,580/month, got a different number") gets looked at and fixed much faster than a general "it's broken" — since it lets us reproduce the exact issue instead of guessing at what went wrong.
This is a small, independently-run site — one person handling development, content, and support — so replies may take a few days rather than a few hours. Bug reports about actual calculation errors get priority over general feedback, since a wrong answer affects everyone using that calculator, not just the person who noticed it. We appreciate your patience either way.