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What to include
- Found a wrong number? Tell us which calculator and the exact inputs you used, so we can reproduce and fix it.
- Requesting a calculator?Describe what it should compute and who it's for.
- Business or advertising inquiry?Include your company and how you'd like to work together.
Response time
We aim to reply within a few business days. Please note we cannot provide personalized financial, tax, medical, or legal advice — our calculators are for general information only.