SaaS Unit Economics Calculator

Free v1.0.0

Calculate your infrastructure cost per customer or API call. Get data-driven insights on pricing, margins, and profitability for bootstrapped SaaS.

What You Get

Transform cloud bills into actionable per-customer metrics. Understand true cost to serve, identify unprofitable customers, and price with confidence based on real infrastructure costs.

The Problem

Bootstrapped SaaS founders struggle to calculate true cost per customer because they lack proper cost allocation. Without this data, pricing decisions are guesses, unprofitable customers subsidize profitable ones, features with high infrastructure costs go unidentified, and scaling becomes a leap of faith rather than a calculated decision.

The Solution

This skill provides a systematic framework for calculating infrastructure unit economics. It separates fixed from variable costs, allocates costs across customer segments or API calls, calculates true per-customer or per-unit metrics with margin analysis, and provides optimization recommendations with dollar impact. Users input their business model (B2B SaaS, API-first, or freemium), customer count, revenue, and cloud costs. A Python script performs accurate financial calculations including cost per customer/unit, gross margin percentages, fixed vs variable breakdown, customer tier analysis, and scaling projections. Claude then interprets results, identifies optimization opportunities (right-sizing, reserved instances, architectural changes), and provides a measurement framework with tagging strategy for ongoing tracking.

How It Works

  1. 1 Describe your SaaS model in JSON format (B2B, API-first, or freemium) with customer count, revenue, and infrastructure costs
  2. 2 Run the Python calculator script using uv to compute unit economics with fixed/variable breakdown and scaling projections
  3. 3 Review calculation results showing cost per customer/call, margins, and profitability by segment
  4. 4 Receive Claude's interpretation of what the numbers mean for your business stage and pricing sustainability
  5. 5 Get optimization recommendations with specific AWS/cloud cost reductions and dollar savings estimates
  6. 6 Implement measurement framework with tagging strategy and monthly review process for ongoing tracking

What You'll Need

  • Monthly cloud infrastructure costs (total and breakdown by service if available)
  • Customer count and revenue model (per customer or per API call)
  • Business model type (B2B SaaS, API-first, or freemium)
  • Python 3.10+ (automatically handled by uv)
  • Basic understanding of which cloud services are used

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