# Technical Debt Cost Calculator

> Value technical debt as remediation cost and annual carrying cost.

Page: https://freecalculator.tech/tools/technical-debt-cost-calculator
Last reviewed: 2026-09-16

## Formula

Principal = Remediation hours × Loaded cost per hour; Technical debt ratio = Principal ÷ (Build hours × Loaded cost per hour); Annual interest = Extra hours lost per month × 12 × Loaded cost per hour

- Principal = Remediation hours × Loaded cost per hour; Technical debt ratio = Principal ÷ (Build hours × Loaded cost per hour); Annual interest = Extra hours lost per month × 12 × Loaded cost per hour.
- Inputs used: Currency, Hours to remediate the debt, Loaded cost per engineer hour, Hours it took to build the system (optional), Extra hours lost each month to the debt (optional).
- Edge handling: Hours to remediate the debt is required.; Hours to remediate the debt cannot be negative.; Hours to remediate the debt must be no more than 1000000000.; Loaded cost per engineer hour is required.; Loaded cost per engineer hour cannot be negative..

## Inputs

- Currency
- Hours to remediate the debt
- Loaded cost per engineer hour
- Hours it took to build the system (optional)
- Extra hours lost each month to the debt (optional)

## Worked example: 1,800 hours of remediation on a 24,000 hour system

Remediation cost and the debt ratio, both from your own measured effort.
1. Start with Currency: USD, Hours to remediate the debt: 1800, Loaded cost per engineer hour: 85, Hours it took to build the system (optional): 24000, Extra hours lost each month to the debt (optional): 40.
2. Apply the method: Principal = Remediation hours × Loaded cost per hour; Technical debt ratio = Principal ÷ (Build hours × Loaded cost per hour); Annual interest = Extra hours lost per month × 12 × Loaded cost per hour.
3. Remediation cost and the debt ratio, both from your own measured effort.

## Common questions

### Where does this formula come from?

SEI, Technical Debt — the principal is the cost of remediating the debt; the interest is the extra effort paid on every change until it is remediated. See the source link on this page.

### What kind of calculation is this?

The principal is the cost of remediating the debt; the interest is the extra effort paid each year until it is remediated. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### What are its limits?

Only as good as the remediation estimate behind it. The debt ratio needs a comparable build-effort figure to mean anything.

### How do I use the Technical Debt Cost Calculator?

Enter the required values for Currency, Hours to remediate the debt, Loaded cost per engineer hour, Hours it took to build the system (optional), Extra hours lost each month to the debt (optional). The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the Technical Debt Cost Calculator use?

Principal = Remediation hours × Loaded cost per hour; Technical debt ratio = Principal ÷ (Build hours × Loaded cost per hour); Annual interest = Extra hours lost per month × 12 × Loaded cost per hour The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### Can the Technical Debt Cost Calculator be used for exact decisions?

Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.

## Limitations and assumptions

- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this technical debt cost calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- Carnegie Mellon University, Software Engineering Institute — https://www.sei.cmu.edu/our-work/technical-debt/

## Cite this page

- APA: Free Calculator. (2026, September 16). Technical Debt Cost Calculator. https://freecalculator.tech/tools/technical-debt-cost-calculator
- MLA: "Technical Debt Cost Calculator." Free Calculator, 16 Sept. 2026, https://freecalculator.tech/tools/technical-debt-cost-calculator.
- Link: Technical Debt Cost Calculator — Free Calculator, https://freecalculator.tech/tools/technical-debt-cost-calculator