GST Calculator
Calculate GST (Goods and Services Tax) instantly. Add GST to a net amount to get the gross total, or remove GST from a gross amount to get the net amount. Supports any GST rate (e.g., 5%, 10%, 18%).
Calculation Type
Enter the net (pre-tax) amount to calculate GST and total (gross) amount.
Enter amount and GST rate to see results
Table of Contents
What is GST?
GST (Goods and Services Tax) is a value-added tax levied on most goods and services sold for domestic consumption. It is used in many countries worldwide, including India, Australia, Canada, New Zealand, Singapore, and Malaysia. GST is typically collected at each stage of the supply chain, with businesses able to claim credits for GST paid on their inputs.
When pricing products or reviewing invoices, you often need to either add GST to a net (pre-tax) amount to get the total price a customer pays, or remove GST from a gross (inclusive) amount to find the net amount and the tax component. This calculator does both in real time.
Key terms:
- Net amount: Price before GST (exclusive of tax)
- Gross amount: Total price including GST (inclusive of tax)
- GST amount: The tax portion (net × rate when adding; gross − net when removing)
How it Works
Our GST calculator supports two modes:
- Add GST (Net → Gross): Enter the net (pre-tax) amount and GST rate. The calculator shows the GST amount and the gross (total) amount.
- Remove GST (Gross → Net): Enter the gross (inclusive) amount and GST rate. The calculator shows the GST amount and the net (pre-tax) amount.
You can use preset GST rates (5%, 10%, 12%, 15%, 18%) or enter any custom rate. Results update automatically as you type. All calculations run in your browser; no data is sent to any server.
GST Formulas
Add GST (Net → Gross)
GST Amount = Net Amount × (Rate ÷ 100)
Gross Amount = Net Amount + GST Amount
Example: Net $100 at 10% GST → GST = $10, Gross = $110.
Remove GST (Gross → Net)
Net Amount = Gross Amount ÷ (1 + Rate ÷ 100)
GST Amount = Gross Amount − Net Amount
Example: Gross $110 at 10% GST → Net = $100, GST = $10.
Common Use Cases
- Invoicing: Add GST to net prices to show customers the total amount due
- Expense claims: Remove GST from receipts to get the net amount and tax portion
- Pricing: Work out selling prices (gross) from cost (net) plus GST
- Accounting: Split gross payments into net revenue and GST for bookkeeping
- Quotes: Quote net and gross amounts for different GST rates (e.g., 5% vs 18%)
- International: Use any rate for different countries (e.g., 5% Canada, 18% India)
Examples
Example 1: Add 10% GST
Net amount: $100
GST rate: 10%
GST: $100 × 0.10 = $10
Gross: $100 + $10 = $110
Example 2: Remove 18% GST
Gross amount: $1,180
GST rate: 18%
Net: $1,180 ÷ 1.18 = $1,000
GST: $1,180 − $1,000 = $180
Example 3: Add 5% GST (e.g. Canada)
Net amount: $50
GST rate: 5%
GST: $50 × 0.05 = $2.50
Gross: $50 + $2.50 = $52.50
Frequently Asked Questions
Net is the amount before GST (exclusive of tax). Gross is the total amount including GST (inclusive of tax). For example, a $100 net amount with 10% GST has a gross amount of $110.
Yes. The same math applies to VAT (Value Added Tax) and other percentage-based sales taxes. Enter your local rate (e.g., 20% VAT in the UK) and use Add GST or Remove GST as needed.
These are common GST/VAT rates: 5% (e.g. Canada GST), 10% (e.g. Australia), 12% and 18% (e.g. India). You can enter any rate you need for your country or scenario.
Results are shown to two decimal places. For official tax or accounting purposes, check your jurisdiction’s rounding rules (e.g. round to nearest cent, or per line item).
No. All calculations run in your browser. We do not send or store your amounts or rates on any server.