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Last updated: October 17, 2026

Do you have a question about the calculator, have you found a bug or would you like to suggest an improvement? Fill in the form and we will get back to you as soon as possible.

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• Check the frequently asked questions: your question may already be answered.
• If you are reporting a bug, tell us the numbers you entered, the result you expected and the browser or device you are using.
• If you share a link to your calculation, we can reproduce the problem faster.

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