Does it support multiple GST tiers?
It focuses on a single rate at a time. Run the calculation separately for each tier if your invoice mixes taxable and non-taxable items.
Step-by-step walkthrough
GST Calculator Guide
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Before you start
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
- gst
- tax inclusive
- tax exclusive
Detailed procedure
Step 1
Enter the amount you know (net or gross).
Step 2
Provide the GST rate for your region.
Step 3
Choose whether to add GST or remove it, then read net, tax, and gross outputs.
Teaching & troubleshooting tips
Can I change currencies?
Yes. The math is percentage based, so simply enter figures in your preferred currency and read the results in the same unit.