How to Calculate GST

What is GST?

GST (Goods and Services Tax) is India's unified indirect tax that replaced multiple cascading taxes (VAT, service tax, excise duty) in 2017. GST has five main slabs: 0%, 5%, 12%, 18%, and 28%. Most services are taxed at 18%; essential goods at 0–5%.

Formula

GST amount = Original price × GST rate / 100

GST: GST price / (1 + GST rate/100) — GST price / (1 + GST rate/100)

Step-by-Step Guide

1GST amount = Original price × GST rate / 100
2Price inclusive of GST = Original price × (1 + GST rate/100)
3Original price from GST-inclusive price = GST price / (1 + GST rate/100)
4CGST = SGST = GST/2 (for intra-state transactions)

Worked Examples

Input

₹10,000 item at 18% GST

Result

GST: ₹1,800 → Total: ₹11,800

CGST ₹900 + SGST ₹900

Input

MRP ₹11,800 inclusive of 18% GST

Result

Base price: ₹10,000

11,800 / 1.18 = 10,000

Frequently Asked Questions

What is Gst?

GST (Goods and Services Tax) is India\. Use this calculator for accurate, instant results.

How accurate is the Gst calculator?

The calculator uses the standard published formula for gst. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Gst calculator use?

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the Gst calculator use?

The core formula is: GST amount = Original price × GST rate / 100. Each step in the calculation is shown so you can verify the result manually.

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