How it is calculated
Total monthly cost is the sum of the lines. Each unit cost is total ÷ volume. Lines are shown as a percentage of the total so you can see where to optimize first. Example inputs are placeholders: replace them with your own bill.
How to use unit costs
- Pick one primary unit that matches how you earn money (per customer, per order, per API call).
- Record it monthly alongside revenue per unit.
- Investigate when cost per unit rises for two months in a row.
- Include staff time: cheap infrastructure that needs a day a week of engineering is not cheap.
How we test this tool
Unit tests check totals, per-unit division, a zero volume returning “n/a” rather than infinity, and shares that add to 100%.
Frequently asked questions
Which unit should I track?
The one closest to revenue: per paying customer for SaaS, per order for e-commerce, per thousand API calls for APIs.
Related
Inputs stay in your browser. Tool maths last reviewed ; the unit tests that pin these formulas are listed in the evidence hub.