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To report a wrong calculation, broken source or accessibility problem, include the page and non-personal inputs you used. Do not send personal or financial records.
A result differs from an official source
Send the calculator name, non-personal input values and a link to the current official source if you have one.
Speech or installation does not work
Arabic speech requires an ar-EG voice on your device. For installation, use a current browser and choose Install app or Add to Home Screen from its menu.
Local data and deletion
There is no user account. Private browsing, changing browsers or clearing this site's storage removes locally saved preferences and checklist state.
Public support channel
Support, corrections and privacy requests: quietorbit4827@proton.me.
Last updated: 29 August 2026