calcengines.com has run 10 ads on Google Search that Ad Repository users have come across, first spotted on 18 Sept 2026 and most recently on 29 Oct 2026. 100% of the creatives are text-only ads. They were seen most in Kenya. On search, they appear for terms such as “conversion folates ng ml en nmol l”, “troponin t conversion pg ml to ng ml”, “tibc conversion ug%2Fdl to umol%2Fl”.