Four calculators for the decisions behind a Google Ads account, using your own margins and costs rather than industry averages: the core PPC metrics (CPC, CTR, CPA and ROAS from any two figures), the maximum CPC bid you can afford from your conversion rate and target cost, the target ROAS that keeps a campaign at the CPA you need, and whether server-side tagging would pay for itself at your traffic level. Each one runs in the browser and stores nothing.