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Babushka Market is independently published and each calculator is reviewed as a practical planning aid. Clear corrections make the tools better for everyone.

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If a formula, unit, assumption or worked example looks wrong, email hello@babushka-market.com. Include the calculator URL, the values you entered and the result you expected.

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Use the same address for privacy questions, accessibility feedback and relevant commercial enquiries. We do not accept paid edits to calculator results or methodology.