Privacy Policy
Last updated: September 23, 2026
The short version
This site doesn't have accounts, doesn't use tracking cookies, and doesn't run analytics or ad scripts. Our calculators run entirely in your browser, and nothing you type into them is sent to us.
Calculators
Everything you enter into our tools (age, weight, height, body fat and so on) is processed by JavaScript on your own device. It isn't transmitted to or stored on our server.
If you use a "Copy share link" button, your inputs are included in that link's address so the page can reload your numbers. Anyone you share the link with can see those values, so only share it with people you're comfortable with.
Information collected automatically
Like almost every website, our hosting provider keeps standard server logs, which can include your IP address, browser type, the page requested, and the time of the request. These logs are used for security and to keep the site running, and are handled under the hosting provider's own policies.
Our pages load fonts from Google Fonts, which means your browser connects to Google's servers to download them. Google's handling of that request is covered by the Google Privacy Policy.
Purchases, downloads, and tips
Our guides and free downloads are delivered through Gumroad, and tips go through Buy Me a Coffee. When you click through to either, you're on their site, and any information you give them (like your email address or payment details) is handled under their privacy policies:
If you download a product or join our email list through Gumroad, we receive the email address you provide so we can deliver what you asked for and send occasional related emails. Every email includes an unsubscribe link, and we never sell your email address.
Children
This site is intended for adults and isn't directed at children under 13.
Health information
Our tools and guides are for general information only and aren't medical advice. Talk to a qualified healthcare professional before making significant changes to your diet, especially if you have a medical condition or take medication.
Changes
If this policy changes, we'll update the date at the top of this page.
Contact
Questions? Email hello@zeroplantco.com.