Free Online GST Calculator India 2026

Instantly calculate CGST, SGST & IGST on any amount. Built for freelancers, startups and businesses billing under India's GST 2.0 framework.

Please enter an amount up to ₹1,00,00,00,000 (100 Crore) for an accurate breakdown.
Choose Exclusive if your amount does not yet include GST, or Inclusive if it already does.
Inter-State Transaction Applies IGST instead of CGST/SGST

Standard Calculation

Calculated under GST 2.0 slabs.

₹0.00

Actual Amount

₹0.00

GST Amount

₹0.00

Total Amount
Base Amount ₹0.00
CGST (9%) ₹0.00
SGST (9%) ₹0.00
IGST (18%) ₹0.00
Total Tax Amount ₹0.00
Total Billed

₹0.00

Amount in Words:

Zero Rupees Only

Engineered for strict architectural compliance.
Designed in Visakhapatnam for high-performance B2B operations.

What Is GST And Why Does It Matter For Your Business?

The Goods and Services Tax (GST) is India's unified indirect tax system that replaced multiple state and central levies with a single tax applied on the supply of goods and services. Every invoice you raise, whether for a product sale or a service like web development, consulting or design, needs to reflect the correct GST component so your business stays compliant and your customers see transparent, accurate billing.

Manually calculating tax splits across CGST, SGST and IGST for every invoice is time-consuming and error-prone. This free GST Calculator removes the guesswork: enter an amount, pick a rate slab, choose Inclusive or Exclusive, and get an instant, accurate breakdown you can save as a PDF for your records or share with clients.

No signup required Works on mobile & desktop Supports GST 2.0 slabs Downloadable PDF receipt

GST Rate Slabs In India 2026

India's GST 2.0 structure simplifies taxation into four principal slabs. Here's a quick reference for the rate that typically applies to common categories.

GST Slab Typical Category CGST + SGST IGST
3% Essential goods, select precious items 1.5% + 1.5% 3%
5% Daily essentials, basic packaged goods 2.5% + 2.5% 5%
18% Standard goods & most professional services 9% + 9% 18%
40% Luxury & sin goods 20% + 20% 40%

Rates vary by specific HSN/SAC code and government notifications. Always confirm the exact slab applicable to your product or service with your CA or the official GST portal before filing.

How To Use This GST Calculator

01
Enter Amount

Type in your base price or total invoice value.

02
Choose Calculation Type

Exclusive adds GST, while Inclusive removes GST from the total.

03
Select GST Slab

Select 3%, 5%, 18% or 40% based on your category.

04
Download Receipt

Export a clean PDF summary for your records.

CGST vs SGST vs IGST Explained

Understand how GST is divided between the Central Government, State Government and inter-state transactions.

CGST
Central Government

Central Goods and Services Tax, collected by the Central Government on intra-state sales.

SGST
State Government

State Goods and Services Tax, collected by the respective State Government on intra-state sales.

IGST
Inter-State Tax

Integrated Goods and Services Tax, applied as a single tax on inter-state and export transactions.

Same State CGST + SGST
Different State IGST
HOW GST IS CALCULATED

GST Calculation Formula

The calculation depends on whether GST needs to be added to your amount or extracted from an existing GST-inclusive price.

01
GST EXCLUSIVE
Add GST
BASE AMOUNT ₹10,000
+
GST @ 18% ₹1,800
=
TOTAL ₹11,800
FORMULA
GST Amount = Base Amount × (Rate ÷ 100)
Total Amount = Base Amount + GST Amount

Example: ₹10,000 + 18% GST = ₹11,800

02
GST INCLUSIVE
Remove GST
TOTAL AMOUNT ₹11,800
−
GST @ 18% ₹1,800
=
BASE AMOUNT ₹10,000
FORMULA
Base Amount = Total Amount ÷ (1 + Rate ÷ 100)
GST Amount = Total Amount − Base Amount

Example: ₹11,800 including 18% GST = ₹10,000 base amount

Which formula should you use?

Use Exclusive when your quoted price does not include GST. Use Inclusive when the amount already contains GST and you need to find the original taxable value.

Frequently Asked Questions

A GST Calculator is an online tool that computes the Goods and Services Tax on a transaction amount. Enter your base amount or total invoice amount, choose the applicable GST slab, and the calculator instantly splits out CGST, SGST or IGST along with the final payable amount.

Under the GST 2.0 structure, the primary slabs are 3%, 5%, 18% and 40%, applied depending on the category of goods or services being billed.

CGST and SGST are charged together in equal halves on intra-state transactions and are collected by the central and state governments respectively. IGST is charged as a single tax on inter-state transactions and is collected by the central government.

To remove GST from a total amount, divide the total by (1 + GST rate ÷ 100) to get the base amount, then subtract that from the total to get the tax amount. This calculator does this automatically in "Inclusive" mode.

Yes, this GST calculator by Zenar Innovations is completely free, requires no signup, and works directly in your browser.

Yes, toggling the "Inter-State Transaction" switch changes the output from CGST plus SGST to a single IGST figure at the same overall rate.
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