How much more expensive is a production bug vs a design bug?

IBM/NIST studies: requirements = 1x, design = 5x, code = 10x, integration = 15x, QA = 25x, production = 50-100x. A $100 requirements bug costs $5,000-10,000 to fix in production.

What is the ROI of unit testing?

Unit testing costs 15-35% extra development time but reduces defect escape rate by 60-80%. ROI depends on production bug cost: at $5,000/production bug, preventing 1 bug/month justifies a 2-person testing team.

How do you measure defect prevention ROI?

ROI = (Production bugs prevented x average bug fix cost) / Testing investment. Track defect density (bugs/KLOC) over time. Each 50% reduction typically represents 2-5x testing investment ROI.

Bug Fix Cost vs Prevention Ratio Calculator

Calculate the cost multiplier of fixing bugs at different SDLC stages. Design: 1x. Development: 5x. QA: 10x. Production: 50-100x. Quantify the ROI of testing.

AI & SaaS Tools

SaaS Metrics

AI Compute

AI ROI

LTV:CAC Ratio

ARPU ($/month)

Monthly Churn %

CAC ($)

Gross Margin %

LTV

$3500

LTV:CAC

11.67

Payback

2.9 mo

Health

Healthy ✓

Benchmark: LTV:CAC ≥ 3 is healthy. Payback under 12 months is excellent. Under 1 means you lose money on each customer.

How to Use

Enter the values for the scenario you are assessing. Calculate the cost multiplier of fixing bugs at different SDLC stages. Design: 1x. Development: 5x. QA: 10x. Production: 50-100x. Quantify the ROI of testing. Use the bug fix vs prevention cost result to inform your calculation.

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Bug Fix Cost vs Prevention Ratio Calculator

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Frequently Asked Questions

How much more expensive is a production bug vs a design bug?

What is the ROI of unit testing?

How do you measure defect prevention ROI?