📚 Software testing calculators
The software testing cluster focuses on QA metrics and Agile planning tools used by testers and SQA leads: defect leakage and DRE, coverage and execution progress, fail and rejection rates, reopen rate, automation coverage and ROI, plus sprint velocity, burndown/burnup, capacity, release forecasting, and risk-based allocation.
Build topical authority in software testing, Agile QA, and performance testing: defect metrics, automation ROI, sprint velocity/capacity, plus throughput, concurrency, latency, error rate, Apdex, and load sizing. Each page keeps one formula and a worked example you can verify in the form.
Key facts
| Primary audience | QA engineers, SDETs, SQA leads, scrum masters, and release managers |
|---|---|
| Core formulas | Part÷whole×100 for metrics; velocity/capacity/effort models for Agile planning |
| Category | Software testing / quality assurance / Agile QA |
| Related hubs | Professional KPIs (pass rate, defect density) and Statistics |
Definitions
Defect leakage
Share of defects found after release (or late phase) relative to all defects found for the release window.
Sprint velocity
Average story points (or equivalent units) completed per sprint over a recent sample.
Release readiness
Share of exit-criteria checklist items met with evidence before go-live.
Formulas
- Leakage %: (post-release defects ÷ total defects) × 100
- Velocity: total points completed ÷ number of sprints
- Burndown remaining %: (remaining ÷ planned) × 100
- Capacity hours: (people × days × hours/day) − PTO − meetings
Comparison table
| Topic | Guidance |
|---|---|
| Leakage vs DRE | Leakage emphasizes escapes; DRE emphasizes pre-release catch rate—often complementary. |
| Burndown vs burnup | Burndown tracks remaining commitment; burnup tracks completion against changing total scope. |
| Throughput vs concurrency | Throughput is work completed per second; concurrency is how many requests are in flight (Little’s Law links them). |
Glossary references
Reinforce entities by pairing percent language with conversion pages when learners mix fractions, decimals, and ratios.
❓ Frequently Asked Questions
Are these ISTQB-official formulas?
They follow common industry definitions used in QA reporting. Confirm naming with your org’s quality glossary before executive dashboards.
Where is test pass rate?
Test pass rate lives under Professional KPIs and is linked from this hub to avoid duplicate thin pages.
Do you cover performance testing metrics?
Yes—Wave 3 adds throughput, concurrent users, response time, error rate, server load, Apdex, latency budget, SLA pass rate, peak-load sizing, and network utilization.