TPS Calculator

What is the TPS Calculator?

The TPS Calculator estimates the transactions per second (TPS) and transactions per hour (TPH) your load test will generate. TPS is the most common way to express throughput in performance testing, so this calculator is useful both before a test, to check that your script and user count will hit the target, and after a test, to sanity-check the throughput you saw.

How it works

Each user completes one iteration every (response time + pacing + think time) seconds, and produces a fixed number of transactions per iteration. Multiplying users by transactions and dividing by the time per iteration gives the sustained transaction rate.

Formula to calculate TPS and TPH

Where:

• Users — Number of concurrent virtual users (threads).
• Transactions per Iteration — Transactions the script executes in one iteration.
• Response Time — End-to-end time to complete one iteration, in seconds.
• Pacing — Delay between two iterations, in seconds (0 if none).
• Think Time — Sum of all think times in the script, in seconds (0 if none).

Example of TPS calculation

A banking script logs in, checks the balance, views a statement, makes a transfer and logs out: 5 transactions per iteration.

Inputs

• Users = 100
• Response Time = 4 seconds
• Transactions per Iteration = 5
• Pacing = 4 seconds
• Think Time = 2 seconds

Step-by-step

1. Time per iteration = 4 + 4 + 2 = 10 seconds
2. TPS = (100 × 5) ÷ 10 = 50
3. TPH = 50 × 3600 = 180,000

Common mistakes to avoid

• Counting "iterations per second" when the script actually runs multiple transactions per iteration — use the transactions field to get real TPS.

• Leaving pacing and think time both at 0 when your script genuinely has delays, which overstates achievable TPS.

• Comparing TPS across scripts with different transaction counts per iteration without normalizing first.