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GST Calculator

Calculate Goods and Services Tax (GST) effortlessly. Quickly calculate GST for intra-state (CGST + SGST) or inter-state (IGST) transactions.

₹
₹100₹1,000,000
%
0%40%
Tax Mode:
Calculation Results
Total Invoice Amount
₹11,800
Total GST: ₹1,800 (18%)
CGST (Central 50%)
₹900
SGST (State 50%)
₹900
IGST (Inter-state 100%)
₹1,800
Pre-Tax Base Amount
₹10,000
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How to use the GST Calculator

  1. 1Enter the base invoice amount.
  2. 2Select the GST slab rate (5%, 12%, 18%, or 28%, or enter a custom rate).
  3. 3Choose whether the price is GST Exclusive (adding tax) or GST Inclusive (extracting tax).

How GST is Calculated

For GST exclusive amounts, GST is calculated by multiplying base price by the rate. For GST inclusive amounts, base price = Total / (1 + Rate / 100). For intra-state supply, GST is split 50:50 into CGST and SGST.

Mathematical Formula
GST Exclusive: GST Amount = Base × (Rate / 100) GST Inclusive: Base Amount = Total / (1 + Rate / 100) CGST = SGST = GST Amount / 2
Formula Variables & Logic
  • Base Amount is the pre-tax price.
  • CGST is Central GST, SGST is State GST, and IGST is Integrated GST.
Worked Example: GST Calculation for Electronics at 18%
Sample Calculation
Scenario: An invoice of ₹50,000 before taxes is subject to 18% GST.
Step-by-step breakdown
  1. 1GST Amount = ₹50,000 × 0.18 = ₹9,000
  2. 2Total Gross Amount = ₹50,000 + ₹9,000 = ₹59,000
  3. 3Intra-state split: CGST (9%) = ₹4,500, SGST (9%) = ₹4,500
Estimated Result
Total Gross is ₹59,000 (CGST: ₹4,500, SGST: ₹4,500).

Rules, Assumptions & Statutory Scope

India & GST JurisdictionsFY 2025-26
Key Calculation Assumptions
  • Standard Indian GST slabs: 5%, 12%, 18%, 28%. Intra-state transactions divide GST equally between CGST and SGST.
Official sources: GST goods and services rates – CBIC
GST rates and classifications are subject to GST Council notifications. Always reconcile calculations with your ERP or GST practitioner.

What affects GST results

  • Applicable HSN/SAC code tax slab.
  • Supply type: Intra-state (CGST + SGST) vs Inter-state (IGST).
  • Composition scheme or exemption status.
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Frequently Asked Questions

What is the difference between CGST, SGST, and IGST?

CGST (Central) and SGST (State) apply equally to intra-state transactions within the same state. IGST (Integrated) applies to inter-state transactions.

How do I extract GST from an MRP or inclusive price?

Divide the total inclusive price by (1 + Tax Rate / 100). For 18% GST, divide by 1.18 to find the original pre-tax value.

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Disclaimer: GST rates and classifications are subject to GST Council notifications. Always reconcile calculations with your ERP or GST practitioner.