GST Calculator
Use this free online tool to get instant results. Fast, secure, and easy to use.
How to Use GST Calculator
1
Choose Calculation Mode
Select "Add GST" (find total from base price) or "Remove GST" (find base from total price).
2
Enter Amount
Input the price. For adding: enter pre-GST amount. For removing: enter total amount inclusive of GST.
3
Select GST Rate
Choose from standard rates (5%, 12%, 18%, 28%) or enter custom rate. Pick correct category for your item.
4
Get Breakdown
See CGST, SGST/IGST split, and final amounts. Copy results for invoices or tax filing.
📋 India GST Slabs
- 0%: Essential goods (milk, bread, fresh fruits)
- 5%: Basic necessities (sugar, tea, edible oil)
- 12%: Processed foods, mobile phones
- 18%: Most goods and services (default rate)
- 28%: Luxury items (cars, tobacco, premium goods)
Frequently Asked Questions
What's the difference between CGST, SGST, and IGST?
CGST (Central) + SGST (State) apply for intra-state sales (within same state). IGST applies for inter-state sales (different states). Our calculator auto-splits based on your selection.
How do I calculate GST from total amount?
Use "Remove GST" mode. Enter total amount (e.g., 1180 for 18% GST). Result: Base = 1000, GST = 180. Formula: GST Amount = (Total × Rate) / (100 + Rate)
Can I use this for other countries?
Yes! Enter custom tax rate. Works for VAT, sales tax, or any percentage-based tax system worldwide. Just adjust rate to match your country's tax percentage.
Is this calculator accurate for invoicing?
Mathematically accurate to 2 decimal places. For legal invoices, verify with your accountant as rounding rules may vary by jurisdiction and transaction type.
What if I have multiple items with different GST rates?
Calculate each item separately, then sum the totals. Or use our "Multiple Items" mode if available, where you can add rows with different rates and quantities.