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How to Use
1 Enter the amount before GST (for Add GST) or the gross amount including GST (for Remove GST)
2 Enter the GST rate — 5%, 12%, 18%, and 28% are the standard Indian slabs
3 Select GST type: CGST + SGST for intra-state, or IGST for inter-state transactions
4 Click Calculate GST to see the full breakdown instantly
5 Use the results for your billing, invoicing, or accounting
Features
Add GST to get the tax-inclusive total in one click
Remove GST from a gross amount to back-calculate base and tax
CGST + SGST split shown for intra-state; IGST for inter-state
Amount in words output for invoices and billing documents
Flexible rounding — 2 decimal places, nearest rupee, or no rounding
100% client-side — nothing is ever sent to a server
Why it Matters
Accurate GST calculation is essential for every Indian business. Errors in tax can lead to compliance issues, audit queries, and financial penalties. This calculator eliminates manual math and ensures your invoices, purchase orders, and expense reports show the right CGST, SGST, and IGST split every time.
★★★★★
Use Cases
Invoicing
Calculate exact GST for customer invoices and billing
Business Accounting
Verify vendor tax amounts and reconcile expense reports
E-commerce Sellers
Compute tax on product listings and marketplace fees
Freelancers
Add GST to service invoices and check your tax liability
How to use
Enter the amount (in INR).
Pick the GST rate — 5%, 12%, 18%, or 28% are the four standard Indian slabs.
Choose Add GST to apply tax, Remove GST to back-calculate from a gross amount, or Check Total to verify a full breakdown.
Pick CGST + SGST for intra-state transactions, or IGST for inter-state.
Understanding GST types
Type
Used for
Split
CGST + SGST
Intra-state (seller and buyer in same state)
Equal halves of total GST
IGST
Inter-state (seller and buyer in different states)
Full GST as single line
Common GST slabs in India
Rate
Category
5%
Essential goods — food, medicine, basic services
12%
Standard goods — processed food, business services
18%
Most goods and services — electronics, restaurants
28%
Luxury goods — cars, tobacco, aerated drinks
Privacy
All calculations happen locally in your browser. No amount, rate, or result is ever sent to any server.
Frequently Asked Questions
How is CGST/SGST/IGST split?
Intra-state: CGST and SGST split the GST equally (e.g. 18% GST = 9% CGST + 9% SGST). Inter-state: full amount as IGST.
Can I remove GST from a total?
Yes — switch to the Remove GST tab and enter the gross (tax-inclusive) amount. We back-calculate base and tax.
What is Check Total?
Check Total shows you the full breakdown of any amount at any rate — useful when you want to verify an invoice total without changing the mode.
Are calculations precise?
We round to two decimals (paise precision) by default. The Round Off option lets you round to the nearest rupee or keep full precision.
Which GST slabs are common in India?
India has four main GST slabs: 5% (essential goods), 12% (standard goods), 18% (most services and goods), and 28% (luxury and sin goods). Use the quick chips to switch between them.
Is anything sent to a server?
No. The calculator runs entirely in your browser. Nothing leaves the page.