Free ToolAI Profitability
AI API Margin Calculator
Enter your monthly numbers to see your LLM gross margin, cost per customer, and AI API profitability — instantly, no signup required.
Your monthly numbers
Total revenue from all customers this month
$
Total LLM API bill this month
$
Number of paying customers this month
Optional — enables cost-per-request metric
Select the model driving most of your API spend
🟢
HealthyYour AI margin is healthy (above 60%)
Gross Margin
70.0%
(Revenue − API spend) / Revenue
Margin per Customer
$350
Revenue/cust − cost/cust
Revenue per Customer
$500
Cost per Customer
$150
GPT-4o API
Break-even Customers
6
customers needed to cover API spend at current pricing
Cost per Request
$0.3
based on 500 req/customer/month
Summary
Monthly revenue$10,000
LLM API spend− $3,000
Gross profit$7,000
Gross margin70.0%
MarginTrace
See margin by customer — not just in aggregate
This calculator shows blended numbers. MarginTrace connects to your real OpenAI and Stripe data to show margin per customer — so you know exactly which customers are profitable.
Start free on MarginTraceFor estimation only. Not financial advice. Results depend on the accuracy of the values you enter.