About the GST Calculator
GST Calculator does the math for you. Enter your values in the format shown and the result appears immediately — no spreadsheets, no formulas to remember, and nothing is uploaded to a server.
How GST works
Tax (GST/VAT) is added on top of the amount:
tax = amount × (rate / 100)total = amount + tax
Worked example — 00 at 18% GST:
- Tax: 1000 × 0.18 = 180
- Total including tax: 1000 + 180 = 1180
How to use
- Enter your values as shown in the input box.
- The result is calculated instantly.
- Click Copy to use it.
Examples
| Input | Result |
|---|---|
00, 18% | 0 tax, 80 total |
, 5% | .50 tax, .50 total |
Common uses
- Quick everyday math.
- Double-checking figures fast.
- Schoolwork and homework.
- Finance, health and planning.
Frequently asked questions
Is my data uploaded?
No — the calculation runs entirely in your browser, so your data stays private.
Is it free?
Yes — completely free with no sign-up.