Free calculators and tools for everyone. EMI, SIP, GST, BMI, PDF converter and more — fast, simple, always free.

No registration. No tracking. No data stored. Your Data Stays with You.

Need to quickly calculate GST on a price? Whether you are a business owner adding GST to your invoice or a consumer checking the GST component in a bill you received, this free tool does the job in seconds.

This GST Calculator lets you add GST to any amount or remove GST from a GST-inclusive price. Select the applicable tax rate — 0%, 5%, 12%, 18% or 28% — and instantly get the CGST, SGST and IGST breakdown along with a complete invoice summary you can copy in one click.

How to Use the GST Calculator

Step 1 — Choose your mode Select Add GST if you have a base price and want to calculate the final price including GST. Select Remove GST if you have a GST-inclusive price and want to find the original base price and GST amount.

Step 2 — Enter the amount Type the amount in the input field. For Add GST mode, enter the original price before tax. For Remove GST mode, enter the total price including GST.

Step 3 — Select GST rate Click the applicable rate — 0%, 5%, 12%, 18% or 28%. The most common rate for most goods and services is 18%.

Step 4 — Read your results The calculator instantly shows the base amount, total GST, CGST and SGST split (for intrastate transactions) or full IGST (for interstate transactions), and the final payable amount.

Step 5 — Copy invoice summary Click the Copy Invoice Summary button to copy the complete GST breakdown to your clipboard — ready to paste into any invoice, email or document.

What is GST and How Does It Work?

GST stands for Goods and Services Tax. It is a comprehensive indirect tax levied on the supply of goods and services across India. GST replaced a complex web of central and state taxes including VAT, service tax, central excise duty and octroi from 1 July 2017.

The key principle of GST — one nation, one tax:

Before GST, a product passing through manufacturer → distributor → retailer attracted multiple taxes at each stage. GST replaced all of these with a single unified tax collected only on the value added at each stage. This eliminated the cascading effect of tax on tax.

Two types of GST in India:

CGST and SGST — When a transaction happens within the same state (intrastate), the GST is split equally between the central government (CGST) and the state government (SGST). For example, 18% GST on an intrastate transaction means 9% CGST + 9% SGST.

IGST — When a transaction crosses state boundaries (interstate), the full GST rate is charged as Integrated GST (IGST) which is collected by the central government and shared with the destination state.

GST Calculation Formula

Adding GST to a price:

GST Amount = Original Price × GST Rate / 100 Final Price = Original Price + GST Amount

Example: Mobile phone costing ₹20,000 with 12% GST

GST = 20,000 × 12 / 100 = ₹2,400 Final price = 20,000 + 2,400 = ₹22,400 CGST = ₹1,200 | SGST = ₹1,200

Removing GST from a GST-inclusive price:

Original Price = Inclusive Price × 100 / (100 + GST Rate) GST Amount = Inclusive Price − Original Price

Example: You paid ₹11,800 for a service. GST rate is 18%.

Original Price = 11,800 × 100 / 118 = ₹10,000 GST Amount = 11,800 − 10,000 = ₹1,800 CGST = ₹900 | SGST = ₹900

What is Input Tax Credit Under GST?

One of the most important features of GST for businesses is Input Tax Credit (ITC). It means a business can deduct the GST it paid on purchases from the GST it must pay on sales.

Example:

  • A manufacturer buys raw materials worth ₹1,00,000 + 18% GST = ₹18,000 GST paid

  • Sells finished goods worth ₹2,00,000 + 18% GST = ₹36,000 GST collected

  • GST payable to government = ₹36,000 − ₹18,000 = ₹18,000 only

This ensures GST is effectively paid only on the value added at each stage of the supply chain, not on the entire price multiple times.

Frequently Asked Questions

Q1. How do I calculate GST on a ₹10,000 item at 18%? GST amount = ₹10,000 × 18/100 = ₹1,800. Final price = ₹11,800. CGST = ₹900, SGST = ₹900. Use our calculator above to get this instantly for any amount and rate.

Q2. What is the GST on mobile phones in India? Mobile phones attract 12% GST in India. On a phone costing ₹20,000 (excluding GST), the GST is ₹2,400, making the final price ₹22,400. CGST = ₹1,200 and SGST = ₹1,200 for intrastate sales.

Q3. What is the GST on restaurants in India? Non-AC restaurants charge 5% GST. AC restaurants charge 5% GST as well since the 2019 revision. However, restaurants in 5-star hotels charge 18% GST. Alcohol served at restaurants is subject to state excise duty and not GST.

Q4. How do I remove GST from an inclusive price? To remove 18% GST from an inclusive price of ₹11,800: divide by 1.18 = ₹10,000 (original price). GST = ₹1,800. For 12%: divide by 1.12. For 5%: divide by 1.05. Use the "Remove GST" mode in our calculator above for instant results.

Q5. What is the difference between CGST, SGST and IGST? CGST (Central GST) and SGST (State GST) are both charged at half the applicable rate on intrastate (within same state) transactions. IGST (Integrated GST) at the full rate is charged on interstate (between states) transactions. For example, 18% GST on intrastate = 9% CGST + 9% SGST. The same 18% on interstate = 18% IGST.

Q6. Is GST charged on exports? No. Exports are zero-rated under GST, meaning the GST rate is 0%. Exporters can also claim a refund of input tax credit on materials used to produce exported goods. This makes Indian exports competitive in international markets.

Q7. What is reverse charge mechanism in GST? Under reverse charge, the recipient of goods or services pays GST directly to the government instead of the supplier. This applies in specific cases such as services from an unregistered dealer to a registered business, import of services and certain notified categories of goods.

Q8. What is the GST on home loan processing fees and insurance? Home loan processing fees attract 18% GST. Life insurance premiums attract 18% GST on the risk premium component. Health insurance premiums also attract 18% GST. Term insurance policies attract 18% GST on the total premium.

Q9. Is there GST on salary or PF contributions? No. Salaries paid to employees are not subject to GST as employment services are outside the scope of GST. Similarly PF, gratuity and ESI contributions are not subject to GST.

Q10. How often do GST rates change? GST rates are revised by the GST Council which meets approximately 3 to 4 times per year. Rate changes are announced by the GST Council and take effect from the notified date. Our calculator is updated to reflect the current applicable rates. Always verify the latest rates from the official GST portal at gstin.gov.in for critical business decisions.