📊 GST Calculator India
Add GST, remove GST, get CGST/SGST/IGST split, and build multi-item invoices — all 5 slabs compared instantly as you type.
Enter the total price including GST. The base price and GST will be extracted.
What is GST?
GST (Goods and Services Tax) is India's unified indirect tax that replaced a complex web of central and state taxes — VAT, service tax, excise duty, CST and more — on 1 July 2017. It is a destination-based, multi-stage tax levied on every value addition in the supply chain. The final GST burden falls on the end consumer, while businesses at every stage claim credit for GST paid on their inputs (ITC).
India operates a dual GST structure: the Centre collects CGST and the States collect SGST on intra-state transactions. On inter-state transactions, a single IGST is levied, which is then shared between the centre and the destination state. This calculator handles all four scenarios — add GST, remove GST, CGST/SGST split, and IGST.
How to Calculate GST in India
Adding GST (exclusive price → inclusive price): Use the "Add GST" tab. Enter the base price (before GST) and select the applicable slab. The formula is:
- GST Amount = Base Price × (GST Rate ÷ 100)
- Total Price = Base Price + GST Amount
- Example: ₹1,000 × 18% = ₹180 GST → Total ₹1,180
Reverse GST Calculator — How it Works
Removing GST (inclusive price → base price): Use the "Remove GST" tab. Enter the total price including GST. The reverse GST formula is:
- Base Price = Total Price ÷ (1 + GST Rate ÷ 100)
- GST Amount = Total Price − Base Price
- Example: ₹1,180 ÷ 1.18 = ₹1,000 base. GST = ₹180
This is essential when you receive a GST-inclusive invoice and need to separate the tax component for accounting or ITC claims.
CGST vs SGST vs IGST — What's the Difference?
India's GST has three components that apply depending on whether a transaction is within a state or crosses state boundaries:
- CGST — Central GST. Collected by the central government on intra-state supplies. Always equal to SGST.
- SGST — State GST. Collected by the state government on intra-state supplies. Equal to CGST.
- IGST — Integrated GST. Applies to inter-state transactions and imports. Collected by the centre and distributed to the destination state.
When a business in Mumbai sells to a customer in Mumbai: 18% GST = 9% CGST + 9% SGST. When the same business sells to a customer in Delhi: 18% IGST (no split). Use the CGST/SGST/IGST tab to calculate the exact breakdown for your transaction.
GST Slabs in India (2024–25)
| Slab | Common Items |
|---|---|
| 0% | Fresh vegetables, milk, eggs, unprocessed food grains, books, newspapers, residential rent |
| 5% | Restaurants (non-AC), basic clothing (<₹1,000), medicines (essential), sugar, tea, coffee |
| 12% | Processed food, mobile phones, computers, business-class air travel, agarbatti |
| 18% | AC restaurants, electronics, hotel rooms (₹2,500–₹7,500/night), capital goods, most services |
| 28% | Luxury cars, aerated drinks, tobacco, luxury hotels (>₹7,500/night), casinos |
GST Composition Scheme Explained
The composition scheme is a simplified GST option for small businesses with annual turnover below ₹1.5 crore (₹75 lakh for certain states and services). Instead of filing quarterly GST returns with full ITC accounting, eligible businesses pay a flat tax on their gross turnover:
- Manufacturers & Traders: 1% of annual turnover
- Restaurants (not serving alcohol): 5% of annual turnover
- Other service providers: 6% of annual turnover
The advantage is dramatically reduced compliance burden — one quarterly return instead of monthly filings. The key trade-off: composition dealers cannot collect GST from customers, cannot claim ITC, and cannot supply goods inter-state. Use the Composition Scheme Calculator above to estimate your liability.
Frequently Asked Questions
How to calculate GST on a price in India?
Multiply the base price by the GST rate and divide by 100. GST Amount = Price × Rate ÷ 100. Total = Price + GST. Example: 18% GST on ₹1,000 = ₹180, total ₹1,180. Use the "Add GST" tab — enter the base amount, select the rate (or click a slab card), and all values update instantly.
How to remove GST from a GST-inclusive price?
Use the "Remove GST" tab. Enter the total GST-inclusive price and select the rate. Formula: Base = Total ÷ (1 + Rate/100). GST = Total − Base. Example: ₹1,180 with 18% GST → Base = ₹1,180 ÷ 1.18 = ₹1,000. GST = ₹180. The formula is shown below the result for verification.
What is the difference between CGST and SGST?
Both apply to intra-state (within the same state) transactions, splitting the GST equally. 18% GST = 9% CGST (paid to the Centre) + 9% SGST (paid to the State). For inter-state transactions, only IGST applies at the full rate (18%), collected by the Centre and shared with the destination state. Use the "CGST / SGST / IGST" tab to see the breakdown.
What are the 5 GST slabs in India?
India has five GST slabs: 0% (essential goods — food grains, milk, vegetables, books), 5% (restaurants, basic clothing, medicines), 12% (processed foods, mobile phones, computers), 18% (most manufactured goods, electronics, AC restaurants, hotels ₹2,500–₹7,500), and 28% (luxury goods, cars, aerated drinks, tobacco). The slab comparison grid at the top of this tool shows all five simultaneously for any amount you enter.
What is IGST and when is it applicable?
IGST (Integrated GST) applies to inter-state supplies — when goods or services move from one state to another — and on imports. The full GST rate is charged as IGST collected by the Centre. The destination state's share is then transferred by the Centre. Select "Inter-State (IGST)" in the CGST/SGST/IGST tab to calculate IGST for your transaction.
What is the GST composition scheme?
A simplified tax option for small businesses with turnover below ₹1.5 crore. Instead of complex monthly GST filings, they pay a flat rate: 1% for manufacturers/traders, 5% for restaurants, 6% for other services. The major limitation: no Input Tax Credit (ITC) can be claimed, and inter-state sales are not permitted. Use the Composition Scheme Calculator section to estimate your annual and quarterly liability.
How to calculate reverse GST?
Reverse GST means extracting the base price from a GST-inclusive total. Formula: Base = Total ÷ (1 + GST Rate ÷ 100). Then GST = Total − Base. Example: ₹1,770 inclusive of 18% GST → Base = ₹1,770 ÷ 1.18 = ₹1,500. GST = ₹270. The "Remove GST" tab handles this automatically — just enter the inclusive amount.