GST Calculator – Calculate GST Online
Calculate GST instantly with our free online GST Calculator. Add or remove GST, choose a GST rate, and see the tax amount, CGST, SGST, and total price instantly.
Calculate GST Inclusive Price
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Your calculations are performed directly in your browser. ToolDec does not require registration or upload your calculation data to a server.
How to Use the GST Calculator
- Select Add GST (to calculate tax on net price) or Remove GST (to deduct tax from gross price).
- Enter the amount in Indian Rupees (₹) or click a quick-amount button.
- Select the applicable GST rate (0%, 5%, 12%, 18%, 28%) or choose Custom to enter a custom percentage.
- Choose whether the transaction is intrastate (CGST + SGST) or interstate (IGST).
- View the breakdown of tax, original price, and total amount updated instantly.
What is GST?
Goods and Services Tax (GST) is a comprehensive, multi-stage, destination-based indirect tax levied on every value addition in India. It replaced many older indirect taxes like VAT, Service Tax, and Excise Duty to create a single unified national market.
What is CGST?
CGST stands for Central Goods and Services Tax. It is collected by the Central Government on intrastate transactions (sales made within the same state).
What is SGST?
SGST stands for State Goods and Services Tax. It is collected by the respective State Government on intrastate transactions alongside CGST.
What is IGST?
IGST stands for Integrated Goods and Services Tax. It is collected by the Central Government for interstate supply of goods and services (sales made between two different states or union territories).
How is GST Calculated?
Formula to Add GST (GST Exclusive):
GST Amount = Amount × (GST Rate / 100)
Total Amount = Amount + GST Amount
Formula to Remove GST (GST Inclusive):
Original Amount = (Inclusive Amount × 100) / (100 + GST Rate)
GST Amount = Inclusive Amount - Original Amount
ToolDec GST Calculator Features
Free GST Calculator
100% free tool with unlimited instant calculations.
Add & Remove GST
Switch seamlessly between GST inclusive and exclusive modes.
CGST & SGST Split
Automatically splits tax equally between Central and State GST.
IGST Calculator
Full support for interstate tax calculations.
Custom GST Rates
Calculate custom tax percentages from 0% to 100% easily.
Instant Calculation
Real-time results with no page reloads or delays.
Copy & Reset
Copy formatted calculation summaries with one click.
Calculation History
Automatically keeps track of your last 5 calculations locally.
Mobile Friendly
Optimized for smartphones, tablets, and desktops.
No Registration
Use instantly without logins, signups, or popups.
Browser Based
100% safe, fast client-side JavaScript calculation.
Frequently Asked Questions (FAQ)
What is a GST Calculator?
A GST Calculator is an online utility that enables businesses and consumers to determine the exact amount of Goods and Services Tax payable on a transaction.
How do I calculate GST on an amount?
Select 'Add GST', input your base amount, select the GST rate percentage, and the calculator automatically computes the GST amount and total price.
How do I remove GST from an inclusive price?
Select 'Remove GST', enter the total inclusive price, choose the GST slab, and the tool extracts the original pre-tax price and tax component.
What are CGST and SGST?
CGST and SGST apply to intrastate transactions. When CGST + SGST is selected, the total GST amount is divided into equal halves (50% each).
What is IGST?
IGST applies to transactions conducted across state lines. The entire tax component is treated as IGST without splitting into CGST/SGST.
What are the common GST rates in India?
Standard GST tax rates in India are categorized under 0%, 5%, 12%, 18%, and 28% tax slabs.
Can I use a custom GST rate?
Yes. Select 'Custom GST Rate' from the rate dropdown and type any valid custom percentage.
Is this GST Calculator free?
Yes, ToolDec GST Calculator is completely free with no usage limits.
Does the calculator store my data?
No. All calculations run strictly inside your web browser. No data is stored or transmitted to external servers.
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