GST Calculator

How GST Calculation Works

GST (Goods and Services Tax) is India's indirect tax system that replaced multiple taxes. It is levied at each stage of the supply chain with input tax credit available.

Adding GST

Net Price	₹10,000
CGST 9%	₹900
SGST 9%	₹900
IGST 18%	₹1,800
Total GST	₹1,800
Total Amount	₹11,800

GST Amount = Original Price × GST Rate / 100
Total Price = Original Price + GST Amount

Removing GST (Extracting from Total)

Net Price = Total Price × 100 / (100 + GST Rate)
GST Amount = Total Price - Net Price

CGST vs SGST vs IGST

Intra-State (within same state): GST is split equally into CGST (Central) and SGST (State).

Inter-State (different states): Full GST is charged as IGST (Integrated GST).

Frequently Asked Questions

What are the current GST rates in India?

India has four main GST slabs: 5%, 12%, 18%, and 28%. Essential items attract 5%, standard goods 12-18%, and luxury/sin goods 28%. Some items like fresh food are exempt (0% GST).

What is the difference between CGST, SGST and IGST?

CGST (Central GST) and SGST (State GST) are charged equally on intra-state transactions. IGST (Integrated GST) is charged on inter-state transactions and equals CGST + SGST combined.

How to calculate GST from total amount?

To extract GST from total: GST Amount = Total - (Total × 100) / (100 + GST Rate). For example, for ₹11,800 with 18% GST: Net = 11800 × 100/118 = ₹10,000, GST = ₹1,800.

What is a GST calculator and how is GST calculated?

A GST calculator adds GST to a base price or strips GST out of a GST-inclusive price: GST amount = base × rate ÷ 100, and base = inclusive price × 100 ÷ (100 + rate).

SnoopTool's GST calculator handles both directions and splits the tax into CGST and SGST for intra-state supply, or shows a single IGST figure for inter-state supply. It supports every Indian GST slab.

GST Calculator: key facts

Reference facts for the SnoopTool GST Calculator, a free browser-based tool.
GST slabs in India	0%, 5%, 12%, 18%, 28%
Add GST (exclusive → inclusive)	Total = base × (1 + rate ÷ 100)
Remove GST (inclusive → base)	Base = total × 100 ÷ (100 + rate)
Intra-state split	CGST = SGST = half the GST amount
Inter-state	One IGST line equal to the full GST amount

Why use the SnoopTool GST Calculator?

Quote a customer an inclusive price without guessing the tax component.
Reverse-engineer the pre-tax value from an invoice total for bookkeeping.
Split tax into CGST/SGST correctly for intra-state invoices.
Check a supplier's invoice arithmetic in seconds.

How to use the GST Calculator (step by step)

Enter the amount. Type the price you have — either before or after GST.
Choose add or remove. Select 'Add GST' for an exclusive price, 'Remove GST' for an inclusive one.
Pick the GST rate. Select 5%, 12%, 18% or 28%, or enter a custom rate.
Read the breakdown. The base amount, GST amount and CGST/SGST or IGST split appear instantly.

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GST Details

GST Breakdown

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