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Digital advertising runs on numbers. CPM tells you what you are paying for attention. CTR tells you how compelling your creative is. ROAS tells you whether your campaigns are profitable. POAS goes one step further and measures profitability directly. Every metric answers a specific question, and understanding all of them together is what separates good media buyers from great ones.

This site gives you free calculators for every core paid media metric - CPM, CTR, CPC, ROAS, POAS, CPL, Frequency and Break-even ROAS. Each calculator works in all directions: give it any two values and it will find the third. No accounts, no paywalls, no limits.

CPMCost Per MilleCost per 1,000 impressions. The standard buying unit for awareness campaigns. CTRClick-Through RatePercentage who clicked after seeing your ad. A direct signal of creative relevance. CPCCost Per ClickWhat you pay per click. The core efficiency metric for traffic campaigns. ROASReturn on Ad SpendRevenue per dollar spent. The primary KPI for e-commerce advertising. POASProfit on Ad SpendProfit per dollar spent. More accurate than ROAS for variable-margin businesses. CPLCost Per LeadWhat you pay per lead. The primary KPI for B2B and lead gen campaigns. FreqFrequencyAverage times a person sees your ad. Too low means low recall. Too high means fatigue. BEBreak-even ROASThe minimum ROAS needed to cover costs. Every campaign needs a target floor.