Base Amount
$0.00
GST Calculator
Use our free GST Calculator to add GST to a price or remove GST from an inclusive amount quickly and accurately.
Finance Utility
GST Calculator
$
%
Final Total (Inc. GST)
$0.00
Live Metrics
GST Amount
$0.00
Final Total
$0.00
100% Secure & Private
Processed locally in your browser. No data is sent to our servers.
How to use
Use this gst tax calculator in three simple steps
Our workflow is designed to be straightforward, allowing you to complete your task in seconds.
01
Pick add or remove GST
Choose whether you want to add GST to a net price or pull GST out of a tax-inclusive total.
02
Enter your amount and rate
Type in the price and set any GST or tax percentage you need, from 5% to 28% or a custom value.
03
Read the breakdown
The tool shows the base amount, the exact tax portion, and the final total the moment you type.
Add or Extract
Calculate price with tax, or find the base price pre-tax.
Custom Rates
Easily adjust the default 18% to any regional standard.
Gross & Net Breakdowns
Isolates exact tax payload for easy ledger recording.
Offline Business
Your invoices and numbers are never tracked remotely.
Use cases
Useful for different workflows
Business Invoices
Calculate GST inclusions or exclusions on sales invoices.
Expense Audit
Verify tax lines inside vendor billing receipts.
Tax Budgeting
Forecast tax provisions in financial dashboards.
Tool guide
GST Calculator
The GST Calculator is an essential tool for business owners, freelancers, and consumers who need to quickly calculate GST-inclusive or GST-exclusive prices. It handles the complex reverse-math of tax extraction instantly.
Whether you are generating an invoice, verifying a bill, or setting prices for your products, this tool ensures accuracy and saves you from manually calculating tax formulas.
Why Use the GST Calculator?
- Instantly toggle between adding and removing GST.
- Extract the exact tax amount from a final receipt.
- Customizable percentage rates to match any country's tax laws.
- Clean, mobile-responsive layout for quick calculations anywhere.
GST formula with examples
Adding and removing GST use two different formulas. Use the first when you have a net price, and the second when you have a GST-inclusive total.
Add GST:GST = Amount × Rate ÷ 100
Remove GST:Base = Total ÷ (1 + Rate ÷ 100)
Example: adding 10% GST to a $100 net price gives $10 GST and a $110 total. Reversing it, a $110 GST-inclusive total at 10% breaks down to a $100 base and $10 GST. The remove-GST math is not simply 10% of the total, which is why the reverse formula matters.
Common GST rates by country
GST and equivalent value-added tax rates vary by country. Enter any custom rate in the tool, or use this table as a quick reference for standard rates.
| Country | Standard rate | Tax name |
|---|---|---|
| Australia | 10% | GST |
| India | 5% / 12% / 18% / 28% | GST (slab-based) |
| New Zealand | 15% | GST |
| Canada | 5% (plus provincial) | GST / HST |
| Singapore | 9% | GST |
| United Kingdom | 20% | VAT |
FAQ
Frequently asked questions
What is GST?
GST stands for Goods and Services Tax. It is a value-added tax levied on most goods and services sold for domestic consumption.
How do I add GST to a price?
Select the 'Add GST' option, enter the base amount, input the GST percentage, and the calculator will automatically compute the GST amount and final total.
How do I remove GST from a total amount?
Select the 'Remove GST' option, enter the total inclusive amount, input the GST rate, and the tool will extract the base amount and the GST portion.
Can I change the GST percentage?
Yes, you can input any custom percentage into the GST Rate field to match your local tax laws.
Is this GST calculator useful for invoices?
Absolutely. Businesses often use this tool to calculate the exact GST to charge on an invoice, or to reverse-calculate the base price from a GST-inclusive receipt.
Can I use it for VAT or sales tax instead of GST?
Yes. The math is the same for any percentage-based tax, so you can enter a VAT or local sales-tax rate and the results still hold.
Are my numbers sent anywhere?
No. Every calculation runs in your browser, so the amounts and rates you enter are never uploaded, saved, or tracked.
From our blog
GST Calculator: Add or Remove Tax in Seconds
Read the full guide behind the GST Calculator and get the most out of it.
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