UUser Acquisition Cost (UAC)

User Acquisition Cost (UAC) is a key performance metric that measures how much you spend on marketing and advertising to gain a single new user or customer. It's calculated by dividing your total marketing spend over a period by the number of new users acquired during that same timeframe. For a mobile app, this might mean the cost per install; for a website, the cost per new visitor or sign-up; for an e-commerce business, the cost per new customer.

Understanding UAC matters because it directly impacts your business profitability and growth strategy. If your customer lifetime value (CLV) is significantly higher than your UAC, you're operating a sustainable, profitable acquisition model. If UAC is climbing whilst CLV remains flat, your marketing efficiency is declining and you need to optimise your approach. Many businesses make the mistake of chasing growth without monitoring this metric, leading to unprofitable customer acquisition that drains resources.

UAC varies significantly across channels and platforms. Google Ads, Meta Ads, and LinkedIn typically have different cost-per-acquisition rates depending on your industry, audience targeting, and campaign quality. The metric also varies by stage: acquiring your first thousand users usually costs more per unit than acquiring your millionth, because of improved targeting, brand recognition, and optimisation data. This is why understanding which channels deliver the lowest UAC for your business is crucial.

To improve UAC, you need to focus on three areas: refining your audience targeting to reach genuinely interested prospects, optimising your conversion funnel so more people who click actually become users, and testing different creative approaches to see what resonates. A/B testing, attribution modelling, and regular cohort analysis help identify which campaigns and channels deserve more budget and which need to be paused or redesigned.