Advertising & disclosure

How the site makes money

Display advertising, served by Google AdSense. That's the entire business model.

What we don't do

• No affiliate links (if this ever changes, it appears here first, per-link, with the label).
• No sponsored placements, no "recommended" products, no lead-selling.
• No paid reviews. There is nothing on this site to review.

Ads don't touch the numbers

Ad code loads after the page and is isolated from the calculator engine. Advertisers never see your inputs (your inputs never leave your browser at all — see Privacy). Ad placement is automatic via Google; we don't choose what you see.

Independence policy

Ad revenue is a flat function of traffic. Writing "SRS is bad" earns exactly the same as "SRS is good" — which is the only way a calculator site can be trusted. When we're wrong, we log it on the Corrections page.