VUH - Virtual User Hour

What is VUH?

Virtual User Hour (VUH) is a credit system for running load tests.

‘VUH’ plans will use VUH as test credits, instead of test counts.

‘VUH’ plans offer greater flexibility than ‘Test Count’ plans. Their flexible consumption model—where you pay only for what you use—provides additional advantages compared to ‘Test Count’ plans.

1 VUH corresponds to 1 virtual user running test for 1 hour.

1.000 virtual users running test for 1 hour would result in 1.000 VUH usage

Loadium calculates VUH consumption by rounding up to 30-minute intervals, rather than a full hour, to provide better cost flexibility.

For example, a test with 1.000 virtual users running for 15 minutes (ceiled to 30 minutes) would result in 500 VUH usage (instead of 1.000 VUH).

How to Calculate VUH?

• Tests between 0–30 minutes will consume VUH at a 0.5x rate.

• Tests between 30–60 minutes will consume VUH at a 1x rate.

• Beyond 60 minutes, usage will continue in 30-minute increments at an additional 0.5x each block.

You may calculate the VUH with the formula below:

How do I determine how much VUH I need?

Below are a few steps and considerations that can help you estimate how much Virtual User Hour (VUH) capacity you’ll need:

1. Identify Test Goals and Parameters

   1. Determine the purpose and scale of your load test. Are you testing peak traffic scenarios, or trying to validate performance under normal load?

   2. Pin down the number of virtual users (VUs) you want to run and the test duration (minutes or hours per test).

2. Use Historical or Similar Test Data

   1. If you’ve performed load tests before, review those metrics. How many virtual users did you employ? How long did each test last?

   2. If you’re unsure, look at your website or application’s typical traffic patterns and consider a safety margin for unexpected spikes.

3. Factor in Test Frequency

   1. Plan for how often you’ll run these tests—monthly, weekly, or daily. Frequent, smaller tests might allow for better control.

4. Leave Room for Adjustments

   1. You may want to allow extra VUH for retests or extended durations if you need to tweak parameters or confirm results.

   2. Having a bit of buffer capacity can save time and ensure you don’t run out of VUH mid-test.

Example for 10,000 VUH Usage:

• Test Series A:

  • 500 Users for 30 min, 6 runs

  • VUH per run: 250

  • Total: 1,500 VUH

• Test Series B

  • 1,000 Users for 60 min, 3 runs

  • VUH per run: 1,000

  • Total: 3,000 VUH

• Test Series C

  • 2,000 Users for 30 min, 3 runs

  • VUH per run: 1,000

  • Total: 3,000 VUH

• Test Series D

  • 5,000 Users for 30 min, 1 run

  • VUH per run: 2,500

  • Total: 2,500 VUH

Grand Total VUH

1,500 + 3,000 + 3,000 + 2,500 = 10,000 VUH

When will you charge my usage from my account?

Before running a load test, you can see how many VUH will be charged from your account under the test parameters slider. When you run the test, the usage will be charged.

We have a prepaid option for VUH. After purchasing VUH, you can see the number of VUH in your account and run your performance tests.

Will I exceed my package limit?

Since we have a prepaid option, you can’t exceed your limit in your package.