Privacy
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The calculator runs in your browser. The numbers you enter are not sent to us. They appear in the page address so you can share a result.
The fonts are loaded from Google Fonts, so Google receives your IP address when the page loads, as it does for any site using its fonts.
When you follow a link to a tool, that tool’s site may set cookies, including one that records that you came from here. What happens there is covered by that tool’s privacy policy.