Confirm the rate
GST rates depend on the classification of the goods or services, so verify the applicable HSN or SAC treatment.
Money Tools · Taxation
GST Calculator
Add GST to a base price or remove GST from a tax-inclusive price in one click. Get the net amount, GST amount, gross amount and the CGST/SGST or IGST split instantly.
Amount details
Tax
Ledger
Ledger
Entry No. 01 — Gross amount
₹1,180
total amount including GST
Net amount₹1,000
Total GST₹180
CGST (9%)₹90
SGST (9%)₹90
GST rate applied is based on the slab selected — verify the correct HSN/SAC rate for your specific goods or service.
Avoid invoice mistakes
Inclusive and exclusive GST calculations
When an amount is GST exclusive, tax is added to the base value. When a quoted price already includes GST, the taxable value must be extracted using the applicable rate—it is not correct to subtract the GST percentage directly from the final price. This calculator handles both directions.
Identify the supply
Intra-state supplies usually split tax into CGST and SGST; inter-state supplies generally use IGST.
Keep invoice values clear
Show taxable value, tax rate, tax amount and final total separately for easier reconciliation.
Rounding practices and special GST rules can create small differences in real invoices. Businesses should reconcile calculated figures with their accounting records and current statutory requirements.
How it works
How to use the GST calculator
Choose Add or Remove GST
"Add GST" starts from a price before tax; "Remove GST" starts from a price that already includes tax.
Enter the amount
Type or slide to the relevant rupee value.
Select the GST rate
Pick the slab that applies to your goods or service — 5%, 12%, 18% or 28%.
Choose the supply type
Intra‑state sales split GST equally into CGST and SGST; inter‑state sales are charged fully as IGST.
Understanding GST
How GST is calculated in India
The Goods and Services Tax (GST) is India's unified indirect tax on the supply of goods and services, replacing a patchwork of earlier state and central taxes. Businesses charge GST on top of the base price and remit it to the government, claiming credit for GST already paid on their own purchases.
| Scenario | Formula |
|---|---|
| Adding GST to a base price | GST amount = Base × Rate ÷ 100; Gross = Base + GST |
| Removing GST from an inclusive price | Net = Gross ÷ (1 + Rate ÷ 100); GST = Gross − Net |
CGST, SGST and IGST explained
When a sale happens within the same state, GST is split equally between the Central Government (CGST) and the State Government (SGST) — for an 18% rate, that's 9% CGST + 9% SGST. When a sale happens between two different states, the entire amount is instead charged as IGST (Integrated GST), which is later apportioned between the centre and the destination state.
FAQ
Frequently asked questions
What are the current GST slabs in India?
The main slabs are 5%, 12%, 18% and 28%, with some essentials at 0% and certain luxury/sin goods attracting additional cess. This calculator covers 5%, 12%, 18% and 28%.
What is the formula to calculate GST?
To add GST: GST amount = (Amount × Rate) ÷ 100, Gross = Amount + GST. To remove GST: Net = Gross ÷ (1 + Rate ÷ 100).
What's the difference between CGST, SGST and IGST?
Intra-state sales split GST equally into CGST and SGST. Inter-state sales are charged entirely as IGST instead.
How do I find the price before GST from a GST-inclusive price?
Divide the inclusive price by (1 + Rate ÷ 100). E.g. ₹118 inclusive of 18% GST = ₹118 ÷ 1.18 = ₹100 base price.
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