GST Calculator

Add GST to a base price or reverse-calculate from a GST-inclusive amount. Covers all standard Indian GST rates with full CGST/SGST or IGST split.

Amount & Rate

Mode

Base Price (excl. GST)

₹

GST Rate

Transaction Type

Your Result

◎

Fill in the details and
your result appears here.

Total with GST

₹—

Base Price—

GST Amount—

Total (incl. GST)—

CGST—

SGST—

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Did You Know?

GST on e-commerce

When you buy from Amazon or Flipkart, the seller charges GST and the platform collects TCS (Tax Collected at Source) at 1% on top. Both show in your invoice.

How to use this calculator

Choose mode

Add GST if you have a base price. Remove GST if you have the final price.

Enter amount

Type the price in rupees.

Select GST rate

Pick 5%, 12%, 18%, 28% or Custom for any other rate.

Choose transaction type

Intra-state splits into CGST+SGST. Inter-state shows IGST.

The formula explained

Two modes — Add or Remove GST:

Add: Total = Base × (1 + Rate/100)

Remove: Base = Total ÷ (1 + Rate/100)

For intra-state transactions, GST splits equally into CGST and SGST. For inter-state, the full amount is collected as IGST.

Frequently Asked Questions

What is CGST and SGST?

For intra-state sales, GST is split equally between Centre (CGST) and State (SGST). Each gets half the applicable rate.

What is IGST?

Inter-State GST — collected by the Centre on cross-state transactions and later distributed to the destination state.

How do I reverse-calculate GST?

Use Remove GST mode. Formula: Base = Inclusive Price ÷ (1 + Rate/100). For 18% on ₹1180 → Base = 1180 ÷ 1.18 = ₹1000.

Which items attract 28% GST?

Luxury items: premium cars, motorcycles above 350cc, tobacco products, aerated drinks, and online gaming/casinos.