Understanding Throughput
How we calculate. Throughput (req/s) = successful requests ÷ test duration in seconds. See our methodology and accuracy policy .
Real-world scenario: A typical Throughput case uses successful requests 180000 and duration (seconds) 600. Enter the same figures below to reproduce the worked path.
What is Throughput?
Throughput is a core load-test KPI. Pair it with error rate and response time—high throughput with rising errors is not a win.
- Count successes only unless you explicitly report attempted throughput
- Steady-state windows beat full-run averages that include ramp-up
- State units clearly (req/s, txn/min, messages/s)
The Formula
Worked Example
Common Use Cases
- Load tests: report sustained capacity
- SLA talks: compare measured vs target TPS
- Tuning: track throughput after config changes
Pro Tips
- Exclude warm-up from the duration window
- Watch saturation when throughput plateaus while latency climbs
- Separate read vs write workloads when patterns differ
| Scenario | When to use |
|---|---|
| Percent of a number | Finding a part of a whole (tax, tip, score) |
| Percent change | Comparing old vs new values |
Limitations: Throughput figures are educational performance-testing aids—not contractual capacity guarantees. Validate with calibrated load tools and production telemetry.
Common mistakes
- Swapping part and whole: The denominator must be the full total, not a subset.
- Rounding too early: Carry extra decimal places through multi-step work before rounding the final percent.
- Mixing percent and decimal forms: Enter rates in the format the calculator labels expect.
The worked example for throughput calculator was verified with the calculator form on this page—enter the same values to confirm the result.
When to use this calculator
- Use this page when your wording matches throughput calculator and the form labels on screen.
- Use percent of a number for “what is X% of Y?” problems.
- Use number is what percent when you know part and whole and need the percent.
Still unsure about throughput calculator? Start with the quick answer above, then open the linked calculator that matches your wording.
❓ Frequently Asked Questions
How do I use this throughput calculator calculator?
For throughput calculator, enter the values labeled on the form, then press Calculate. Compare the result to the worked example on this page.
What formula does this page use?
See the quick answer and formula box above for throughput calculator—the same percentage calculator expression is applied to your inputs.
What if my result looks wrong?
When checking throughput calculator, re-check part vs whole (or rate vs base), rounding, and whether percents were entered as 25 rather than 0.25 when the form expects percents.
Authoritative References
For performance and quality engineering context, consult:
- ISTQB — performance testing syllabus topics
- W3C Navigation Timing — browser performance timing
- CMG / capacity forums — capacity and performance practice communities