Contact

Tell us what needs attention

Babushka Market is an independent website. Reports of errors are the most useful feedback it receives, because they make the calculators better for everyone.

Calculator methods and corrections

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.

Privacy and partnerships

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