AI Cost Leak Calculator
Enter your AI bill and customer mix. See exactly how much is going to free users, underpriced heavy users, and unattributed spend — and what PerUnit recovers.
Your numbers
Your combined OpenAI / Anthropic / Google bill
Users who actively use AI features
What your typical paid customer pays per month
What this assumes
Free tier gets a proportional share of AI spend. Top 20% of paid users drive ~80% of paid-user AI cost (Pareto). ~30% of spend is unattributed without per-customer tracking. Savings estimates use conservative recovery rates (35% on free tier, 60% on repricing, 20% on invisible).
Where your AI spend goes
Monthly spend breakdown
Free tier drain
Your free tier consumes $1,500.00/month with $0 revenue.
Capping the top 20% of free-tier consumers saves ~$525.00/month.
Underpriced heavy users
Your heavy users are within margin at $49.00/month. No repricing opportunity here.
Invisible spend
~30% of your AI bill isn't attributed to any customer or feature. You can't optimize what you can't see.
Conservative 20% optimization opportunity = $300.00/month.
Total recoverable with PerUnit
$825.00/month
17% of your AI bill
PerUnit cost
$99/month
Estimated payback
4 days
Annual net savings
$8,712.00(733% ROI)
Estimates based on industry benchmarks. Actual savings depend on your product, pricing, and how you act on the data PerUnit surfaces.
This calculator shows the leaks. PerUnit shows you exactly which customers and features are causing them.
Connect your OpenAI, Anthropic, and Google accounts. Get cost by customer, feature, and pricing tier — with Stripe revenue alongside. No pipelines, no engineering.
Get early access to PerUnitFrequently asked questions
- How accurate is this AI savings calculator?
- The calculator uses industry benchmarks: free tiers typically consume a proportional share of AI spend, top 20% of paid users drive ~80% of paid-user cost (Pareto principle), and ~30% of spend is unattributed without per-customer tracking. Your actual numbers will vary — PerUnit gives you the real breakdown from your provider APIs.
- What does 'invisible spend' mean?
- Invisible spend is the portion of your AI bill that isn't attributed to any specific customer or feature. Without cost attribution, you can't see which requests came from which user. PerUnit connects your usage data to customer IDs so you can see exactly where every dollar goes.
- Why would my heavy users be unprofitable?
- If you charge a flat monthly price, heavy AI users cost more to serve than light users — but they pay the same. When one user's AI cost exceeds what they pay you, that customer is generating negative margin. Usage-based pricing or higher tiers for power users fixes this.
- How does PerUnit help me recover these savings?
- PerUnit connects directly to your OpenAI, Anthropic, and Google accounts and attributes costs by customer, feature, and pricing tier. Once you see which customers and features drive spend, you can gate AI on free tiers, add usage overages, reprice plans, or route to cheaper models — decisions that are impossible without the data.
- Do I need to build a data pipeline to use PerUnit?
- No. PerUnit syncs directly with your AI provider APIs. You connect your accounts, tag customer IDs in your API calls (or use our SDK), and get the breakdown. No logging infrastructure, no data warehouse, no engineering months.