Use this free online GST calculator to add or remove GST from any price in seconds. It covers all Indian GST slabs from 0% to 40% (updated for the GST 2.0 reform), including special rates, and shows the CGST/SGST split so you always know the exact tax and final amount.
GST Calculator
Add or remove GST instantly — updated for GST 2.0 slabs (0% to 40%) with CGST/SGST split.
| Base amount (excl. GST) | |
| GST amount | |
| CGST (half) | |
| SGST (half) | |
| Total payable |
| Rate | Typically applies to |
|---|---|
| 0% | Fresh food grains, milk, bread, books, education & health services |
| 5% | Essential goods — packaged foods, footwear under ₹2,500, small restaurants, life-saving drugs |
| 18% | Standard rate — most goods & services including electronics, IT services, soaps, AC restaurants |
| 40% | Luxury & sin goods — high-end cars, tobacco, aerated drinks, premium hotels, betting & casinos |
Note: Under the GST 2.0 reform (effective 22 September 2025), the 12% and 28% slabs were abolished. Most items moved to 5% or 18%, while luxury and sin goods now attract 40%. CGST + SGST applies to intra-state sales (each is half the GST rate); inter-state sales attract IGST at the full rate.
How to use this GST calculator
Start by picking the tab that matches your need. Use "Add GST" when you have a base price and want to charge tax on top of it; switch to "Remove GST" when you have a price that already includes tax and want to see the base value. Then type your amount into the amount field and choose the GST rate that applies to your item.
Select a preset slab such as 5%, 12%, 18%, or 28% from the dropdown, or choose "Custom rate" to enter any other percentage. Press the calculate button and the tool instantly displays the base amount, the GST amount, and the CGST/SGST split (each is half of the total GST for sales within a state), along with the final figure you need.
When should you use each mode of this GST calculator? Pick "Add GST" when you are billing a customer on a tax-exclusive price — for example, goods worth ₹1,000 at 18% GST give a total of ₹1,180. Pick "Remove GST" when you want to break down a tax-inclusive bill to find the base price and the tax amount hidden inside it. If you work with numbers often, try our CGPA to Percentage Calculator for quick academic conversions, and bookmark this GST calculator for tax math. It follows the standard slabs notified by the CBIC (Central Board of Indirect Taxes and Customs).
What Is a GST Calculator?
A GST calculator is a free online tool that instantly adds or removes Goods and Services Tax from any amount. Instead of doing manual percentage math, you enter the base price (or the tax-inclusive price), pick the GST slab, and the calculator shows the tax amount, the CGST/SGST split, and the final total in one click.
For businesses, it speeds up invoicing and quoting. For shoppers, it reveals how much tax is hidden inside a price tag. For students and accountants, it is a quick way to verify GST math without errors.
GST Slabs in India (Updated for GST 2.0)
Under the GST 2.0 reform effective 22 September 2025, India now has four main GST slabs. The old 12% and 28% slabs were abolished — most goods moved to 5% or 18%, while luxury and sin goods now attract 40%.
| GST Rate | Applies To (Examples) |
|---|---|
| 0% | Fresh food, milk, bread, books, education & healthcare services |
| 5% | Essential goods — packaged foods, footwear under ₹2,500, economy hotels, life-saving drugs |
| 18% | Standard rate — electronics, IT services, soaps, restaurants, most services |
| 40% | Luxury & sin goods — premium cars, tobacco, aerated drinks, casinos, high-end hotels |
Special rates of 0.1%, 0.25%, 1%, 1.5%, 3%, 6% and 7.5% continue to apply to specific items such as gold, diamonds and composition-scheme dealers.
GST Calculation Formulas (With Examples)
To add GST: GST Amount = Base Price × (GST Rate ÷ 100). Total = Base Price + GST Amount.
Example: Base ₹1,000 at 18% → GST = ₹180, Total = ₹1,180.
To remove GST: Base Price = Total Price ÷ (1 + GST Rate ÷ 100). GST Amount = Total − Base.
Example: Total ₹1,180 at 18% → Base = ₹1,000, GST = ₹180.
CGST/SGST split: For intra-state sales, CGST = SGST = GST Amount ÷ 2.
Example: ₹180 GST → CGST ₹90 + SGST ₹90.
CGST vs SGST vs IGST
CGST (Central GST) and SGST (State GST) apply when the buyer and seller are in the same state — each is charged at half the total GST rate. IGST (Integrated GST) applies to inter-state sales at the full rate and goes to the central government.
Example: A ₹1,000 item at 18% GST sold within Maharashtra → CGST ₹90 + SGST ₹90. The same item sold from Maharashtra to Delhi → IGST ₹180.
Who Should Use This GST Calculator?
Business owners & freelancers: Generate GST-inclusive quotes and verify tax on purchase bills.
Online shoppers: Check how much GST is included in the price you pay.
Accountants & CA students: Quickly verify GST calculations and understand slab impacts.
Anyone: Convert between tax-exclusive and tax-inclusive prices in seconds — no signup needed.
FAQs
How do I remove GST from a price?
Switch to the Remove GST tab, enter the GST-inclusive amount and the rate, then click Remove GST. The base price is found with: Base = Total × 100 ÷ (100 + GST%).
What are the GST slabs in India?
India has four main GST slabs — 5%, 12%, 18% and 28% — plus 0% for exempt items and special rates like 0.1%, 0.25%, 1%, 1.5%, 3% and 6% for specific goods such as gold and rough diamonds. This calculator includes all of them plus a custom-rate option.
What is the difference between CGST, SGST and IGST?
CGST and SGST apply to sales within the same state — each is half the total GST rate. IGST applies to inter-state sales at the full rate. The calculator shows the CGST/SGST split for intra-state transactions.
Is this GST calculator free and accurate?
Yes, it is completely free and uses the standard GST formulas. Rates follow the GST Council slabs, but for official invoices always verify the applicable rate on cbic.gov.in, as slabs can change.