GST Calculator India

Compute CGST, SGST, IGST splits and invoice totals easily.

Base Amount (INR - ₹)

₹

GST Slabs

Calculation Action

Transaction Region

Tax Computation Details

Net Amount (Excluded)₹0.00

CGST (9%)₹0.00

SGST (9%)₹0.00

Total GST Tax₹0.00

Total Gross Amount (Receipt Total)

₹0.00

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Features

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GST Returns

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App Rating

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About This Calculator & Guide

The Indian GST Calculator is a specialized financial utility designed to compute the Goods and Services Tax (GST) applicable to products and services in India. Introduced on July 1, 2017, the GST unified India's complex multi-layered indirect taxation system into a single tax regime. This tool is pre-configured with the standard Indian tax slab thresholds, enabling business owners, accountants, and buyers to calculate tax values instantly.

How the GST Calculation Engine Works

GST calculations are based on two actions: adding tax to a net price (inclusive calculation) or removing tax from a gross price to find the original value (exclusive calculation). The formulas are structured as follows:

1. Formula to Add GST (Inclusive Calculation)

To find the gross receipt total after adding tax to the base price:

GST Amount = (Base Price × GST Rate) ÷ 100
Gross Amount = Base Price + GST Amount

Worked Example: If the base price of a service is ₹10,000 and the tax slab is 18%, the calculation is: GST = (10,000 × 18) ÷ 100 = ₹1,800. The final gross invoice receipt total is ₹11,800.

2. Formula to Remove GST (Exclusive Calculation)

To reverse-calculate the net base price when only the receipt total is known:

Net Amount = Gross Price ÷ (1 + (GST Rate ÷ 100))
GST Tax Amount = Gross Price - Net Amount

Worked Example: If an item costs ₹11,800 gross (inclusive of 18% GST), the original base price is: Net = 11,800 ÷ (1 + 0.18) = ₹10,000. The tax component is ₹1,800.

Understanding CGST, SGST, and IGST Splits

GST is divided into sub-components based on where transactions occur. This split is critical for compliance and GSTR billing filings:

CGST (Central Goods and Services Tax): Collected by the Central Government on intra-state transactions (sales within the same state).
SGST (State Goods and Services Tax): Collected by the State Government on intra-state transactions. On intra-state sales, the active GST slab is split 50/50. For example, an 18% GST charge is split into 9% CGST and 9% SGST.
IGST (Integrated Goods and Services Tax): Collected by the Central Government on inter-state transactions (sales between different states). The entire tax rate applies to the IGST component (e.g. 18% full IGST).

Indian GST Slab Structure

The GST Council has structured goods and services into five tax rates:

0% (Nil Rated): Essential items like fresh vegetables, milk, grains, and salt.
5%: Common items like sugar, tea, coffee, edible oil, and domestic coal.
12%: Standard items like processed foods, butter, cheese, and cell phones.
18% (Standard Rate): Most industrial goods, IT services, capital goods, and restaurants. This is the default setting for this calculator.
28% (Demerit/Luxury Slabs): Luxury cars, aerated drinks, cigarettes, and consumer appliances.

Frequently Asked Questions

How do I split GST into CGST and SGST?+

When a sale occurs within the same state, the GST rate is divided equally between the Central (CGST) and State (SGST) governments. For example, if the GST rate is 18%, the CGST is 9% and the SGST is 9%.

When does IGST apply instead of CGST/SGST?+

IGST (Integrated GST) applies to inter-state transactions, where the supplier and the customer are located in different states. The full GST percentage is allocated to IGST.

How do I calculate GST back to the net price?+

To calculate the price excluding GST, divide the gross amount by (1 + GST rate/100). For example, if a product is ₹1,180 inclusive of 18% GST: ₹1,180 / 1.18 = ₹1,000 net price.