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Financial Calculators

GST Calculator

Calculate Goods and Services Tax for an invoice. Add GST to a base price, or extract it from a GST-inclusive amount, and see how it splits between CGST and SGST (sales within a state) or IGST (sales between states).

Calculation
$
%
Total incl. GST₹2,950.00
GST amount
₹450.00
CGST (9%)
₹225.00
SGST/UTGST (9%)
₹225.00
Base amount
₹2,500.00
Step-by-step working
  1. GST = ₹2,500.00 × 18% = ₹450.00
  2. Total = ₹2,500.00 + ₹450.00 = ₹2,950.00

Since 22 September 2025, most goods and services fall in the 5% or 18% slabs, with 40% for a short list of luxury and sin goods; 0%, 0.25% and 3% apply to specific items. Check the current rate for your HSN/SAC code.

How to use the GST Calculator

  1. Choose whether the amount is before GST (add) or includes GST (remove).
  2. Enter the amount and the GST rate for your product or service.
  3. Choose intra-state or inter-state supply.
  4. Press Calculate.

Formula

Add GST: GST = Amount × Rate ÷ 100; Total = Amount + GST

Remove GST: Base = Total × 100 ÷ (100 + Rate); GST = Total − Base

Intra-state: CGST = SGST = GST ÷ 2. Inter-state: IGST = full GST.

Examples

  • ₹2,500 + 18% GST = ₹2,950; CGST ₹225 + SGST ₹225.
  • ₹1,050 inclusive of 5% GST → base ₹1,000, GST ₹50.

Frequently asked questions

When is IGST charged instead of CGST and SGST?

IGST applies when the supplier and the place of supply are in different states or union territories, and on imports. Supplies within one state attract CGST plus SGST (or UTGST).

Is this valid for filing returns?

It gives the arithmetic. Your tax liability depends on classification, input tax credit and other rules, so confirm with a tax professional for filings.

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