Support
the site

Why this page exists

Calculate has no ads, no paywall and no premium tier — and the plan is to keep it that way. If one of the 70 calculators saved you a headache and you feel like putting a coffee in the tip jar, this is the place. Entirely optional; the tools stay free either way.

The tip jar (coming soon)

A one-tap "buy me a coffee" option is on its way. Until it lands, the support below costs nothing — and honestly helps more.

Free ways to help

Genuinely as valuable: share a calculator with someone who needs it, link to a page from your site or classroom resources, or send corrections and ideas to business@luck.fyi. Every link and every fixed mistake makes the site better.