CPM, CPC and CTR calculator

CPM (Cost Per Mille) measures the price paid for every 1,000 impressions of your ad. Across major platforms like Meta, TikTok and YouTube, real-time auctions price ad space on impressions rather than clicks.

CPM reflects market competition, audience rarity, and seasonal demand. While a lower CPM means broader reach for the same money, cheap impressions from low-intent placements rarely convert. True efficiency combines an appropriate CPM with high conversion intent.

Cost Per Click (CPC) reflects the cost of acquiring one site visit, while Click-Through Rate (CTR) gauges the resonance of your message and creative. On platforms with quality-scoring auctions like Google Ads, higher CTR directly reduces your CPC.

Improving CTR through compelling ad copy and clear value propositions allows you to capture more traffic from the same impression volume without bidding higher.

Conversion rate (CVR) is the percentage of clicks that result in an order or qualified lead. Cost Per Acquisition (CPA) is total ad spend divided by completed conversions.

Even if your CPC remains flat, doubling your website conversion rate from 1% to 2% cuts your CPA exactly in half. That is why landing page work belongs in every ad optimisation plan, not just bids and budgets.

All performance metrics are algebraically linked: "CPC = CPM ÷ (10 × CTR)". When CTR doubles at a constant CPM, CPC drops by 50%.

However, budget projections cannot assume infinite linearity. As budgets scale up, ad frequency rises, creative fatigue sets in, and marginal CPCs usually climb. Treat budget forecasts as baseline targets rather than guaranteed outcomes.