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Spotted an error in a calculation, have a tool you'd like us to build, or have a question about our methodology? We read every message.
Report a calculation issue
If you believe a result is incorrect, please tell us the calculator, the exact inputs you used, and what result you expected. This lets us reproduce and fix the issue quickly.
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Tell us what you're trying to calculate and why — the more specific the use case, the more useful the tool we build will be.