You're running ads. Your dashboard is full of numbers. CPC is low. CTR looks decent. But your bank account isn’t celebrating . Here’s the hard truth in 2025: Not all PPC metrics matter equally. Vanity metrics like clicks and impressions might look nice in a report — but they rarely tell you if your campaigns are profitable. If you want to scale your paid ads (whether it's Google, Meta, Amazon, or beyond), you need to laser-focus on the five metrics that actually predict profitability . In this blog, we’ll break down each one — and how to use it to make smarter, faster ad decisions. 1. Customer Acquisition Cost (CAC) “How much are you paying to get a paying customer?” This is the most important metric. It tells you if your PPC campaign is sustainable. Formula: 📊 Total Ad Spend ÷ Number of New Customers If your CAC is higher than your average order value or customer lifetime value, you’re not making money — you’re buying losses . Pro Tip: Track CAC per chann...