Last updated 2026
This site runs entirely in your browser. The numbers and dates you type are processed locally and never leave your device. There is no backend, no analytics, no tracking pixels, and no third-party cookies.
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The site stores two small preferences in your browser's local storage — your theme choice and a counter that rotates the tip line — which are not transmitted anywhere and contain no personal data. You can clear them at any time from your browser settings.
The "Support on Ko-fi" button opens Ko-fi (operated by Ko-fi Labs Ltd.) in an embedded frame or new tab. Ko-fi handles any payments and applies its own privacy policy.
The tools on this site are provided "as is" for general informational purposes only. Results are produced from your inputs using standard formulas and are not verified, stored, or transmitted.
Nothing here is financial, tax, accounting, legal, or investment advice. Before relying on a calculation for business, tax, contract, payroll, or other consequential decisions, please verify the result with a qualified professional.
Date calculations follow ISO 8601 (week 1 contains the first Thursday of the year, weeks start Monday). "Business days" means Monday through Friday and does not account for public holidays.
To the maximum extent permitted by applicable law, the operator disclaims all warranties and is not liable for any damages arising from use of this site.
Questions or concerns: privacy@hako.to