Do Your Own Math

Privacy policy

Last reviewed: 19 October 2026

The short version: this site is a set of calculators and guides. It has no accounts, no newsletter, no comment forms and no advertising network. We collect as close to nothing as a website can.

What we collect

Affiliate links

Outbound product links are plain links to the retailer: no affiliate code and no commission. When you follow one, the retailer's own privacy policy applies on its site. How this site is funded is explained on how we make money.

Links to other sites

We link to certifiers, manufacturers, studies and retailers so you can check our sources. Their sites have their own privacy practices; we are not responsible for them.

Children

The site is general-audience information and is not directed at children under 16. We knowingly collect no personal data from anyone, children included.

Your rights

Because we hold no personal data about you, there is nothing for us to export, correct or delete. If you believe that is wrong in your case, use the contact route on the about page and we will look.

Changes

If the way the site works changes — for instance if we ever add a newsletter — this page will change first, and the date at the top will move. Material changes are also listed on the changes page.