Paid Ad ROI & CPI Calculator
Evaluate your campaign economics. Calculate your Cost Per Acquisition (CAC), Return on Ad Spend (ROAS), and identify the maximum Cost Per Click you can afford.
Campaign Inputs
Your ad spend is higher than the customer lifetime value. Try optimizing your landing page conversion rate or improving your ad CTR to get a lower CPC.
You are losing money on every user you acquire. Optimize conversions.
If your CPC exceeds this limit on TikTok or Meta, the campaign will instantly run at a loss.
How is this calculated?
Your CAC is determined by multiplying the number of ad clicks required to generate one paying customer (which is 1 / (Landing Page Conversion % * Signup to Paid Conversion %)) by your Cost Per Click (CPC). CPI is computed as CPC / Landing Page Conversion %. Optimizing your ad creative decreases the CPC bid rate, directly lowering your customer acquisition costs.
Lower your CAC with slideshow video ads
High-CTR video carousels convert up to 3× better than generic static templates. SlidesTok helps you turn screenshots, logos, and testimonials into high-engagement slideshows for TikTok and Reels ads, lowering CPC costs.