🧾 GST Calculator

How GST Is Calculated

The Goods and Services Tax (GST) is India's single indirect tax on the supply of goods and services. Businesses add GST to their prices, collect it from customers, and deposit it with the government after adjusting for the tax already paid on their own purchases (input tax credit). Common rate slabs are 0%, 5%, 12%, 18% and 28%.

This GST calculator works both ways. To add GST to a base price: GST amount = price × rate ÷ 100. To remove GST from a GST-inclusive price: base = inclusive price × 100 ÷ (100 + rate). For sales within a state the tax splits equally into CGST and SGST; for inter-state sales a single IGST applies.

For example, on a ₹10,000 product at 18% GST, the tax is ₹1,800 (₹900 CGST + ₹900 SGST) and the final price is ₹11,800. If a ₹11,800 price already includes 18% GST, the base value is ₹10,000 and the tax is ₹1,800. Enter your amount and slab to compute all of this instantly.

Key points to remember

• Within a state, GST splits into CGST + SGST equally.
• Between states, a single IGST is charged instead.
• Keep valid tax invoices to claim input tax credit.

Frequently asked questions

CGST and SGST are charged on sales within a state (going to the centre and state); IGST is charged on inter-state sales.

Divide the inclusive price by (100 + rate) and multiply by 100 to get the base value.