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GST Calculator India — CGST, SGST & IGST Breakdown Online Free

Calculate GST for any amount and rate instantly. Get CGST + SGST breakdown for intra-state transactions or IGST for inter-state. Supports all Indian GST rates with step-by-step formula. Free, no sign-up, works in browser.

GST Calculator India — Add GST to base price
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Results update instantly · Keyboard: Esc to clear · Ctrl+Enter to copy

Please enter both amount and GST rate.

Quick examples

What Is GST and How Does a GST Calculator Work?

GST (Goods and Services Tax) is India's unified indirect tax system, introduced on 1 July 2017 under the CGST Act 2017. It replaced a complex web of central and state taxes — VAT, service tax, excise duty, and more — with a single, destination-based tax rate system.

Our GST calculator India uses the standard GST calculation formula to compute tax amounts instantly. You can add GST to a base price (exclusive to inclusive) or remove GST from a total price (inclusive to exclusive). The tool automatically applies India's GST regulations to split the tax into CGST + SGST for intra-state or IGST for inter-state transactions.

Whether you're a business owner raising invoices, a consumer verifying charges, or a student learning tax calculation — this GST calculator online free gives you accurate results with full transparency.

GST Calculation Formula — Add & Remove GST

There are two standard GST calculation formulas used in India:

➕ Adding GST (Exclusive → Inclusive)

GST Amount = Base Price × GST Rate ÷ 100Total = Base Price + GST Amount

Example: Add 18% GST to ₹1,000 → GST = ₹180 → Total = ₹1,180

➖ Removing GST (Inclusive → Exclusive)

Base = Total ÷ (1 + GST Rate ÷ 100)GST = Total − Base Amount

Example: Remove 18% from ₹1,180 → Base = ₹1,000 → GST = ₹180

CGST, SGST, IGST — Understanding the GST Split

India's GST has a dual structure — the tax revenue is shared between the Central and State governments. Our CGST SGST IGST calculator automatically applies the correct split based on your transaction type:

CGST + SGST (Intra-state transactions)
When the supplier and buyer are in the same state, GST is split equally. For an 18% rate: CGST = 9% (goes to Central Government) + SGST = 9% (goes to State Government). Our GST calculator with CGST SGST breakdown shows both components clearly.
IGST (Inter-state transactions)
When goods or services move between different states, the full GST is collected as IGST by the Central Government. The Centre then apportions the state's share to the destination state. No CGST or SGST applies. E-commerce transactions and imports also attract IGST.
UTGST (Union Territory GST)
For transactions in Union Territories without legislatures (Chandigarh, Dadra & Nagar Haveli, Daman & Diu, Lakshadweep, Andaman & Nicobar Islands), UTGST replaces SGST. The rate and calculation are identical to SGST.

GST Rates in India — All Rate Slabs Explained

India's GST Council periodically reviews and revises GST rates in India. The main slabs and their applicable categories are:

0%Exempt

Fresh vegetables, milk, eggs, salt, bread, prasad, books, contraceptives

5%Essential Goods

Frozen vegetables, coffee, edible oils, economy class flights, railways, life-saving drugs

12%Standard Goods

Processed food, butter, cheese, fruit juices, business class flights, mobile phones, fertilisers

18%Most Services & Goods

Restaurants (AC), hotels, IT services, financial services, banking, insurance, hair care, cement

28%Luxury / Demerit

Cars, motorcycles above 350cc, tobacco, gutka, aerated drinks, casinos, gaming, cement (certain)

Special rates also exist: 0.1% (diamonds), 0.25% (rough precious stones), 1.5% (cut and polished diamonds), 3% (gold, silver), 6% (services in certain categories), 7.5% (some textile machinery). Always verify the applicable HSN/SAC code and current rate on the official CBIC portal before raising invoices.

When to Use the GST Calculator India

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Raising GST Invoices

Calculate the exact GST amount and total invoice value for your customers. Add the correct CGST/SGST or IGST based on the buyer's state.

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Verifying Purchase Bills

Check if the GST charged on a vendor or supplier invoice is correct. Use the 'Remove GST' mode to verify the pre-tax base amount.

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Real Estate & Construction

Calculate 5% GST on affordable housing (₹45 lakh or less) or 18% on construction services. Cement attracts 28% GST — factor this into project cost estimates.

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Vehicle Purchases

Cars attract 28% GST plus an additional Compensation Cess of 1–22% depending on engine capacity and type. Use this GST calculator for the base 28% component.

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IT & Software Services

Software services, IT consulting, and cloud services attract 18% GST. For B2B invoices, your client can claim this as Input Tax Credit (ITC) — keep proper documentation.

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Restaurant Bills

AC restaurants charge 5% GST (no ITC). Non-AC restaurants charge 5% GST. Hotels charging ₹7,500+ per night may charge 18% on food. Our GST calculator online free handles all rates.

Frequently Asked Questions — GST Calculator India

What is the GST calculator formula?+
To add GST: Total = Base Price + (Base Price × GST Rate / 100). To remove GST from an inclusive price: Base Price = Inclusive Price / (1 + GST Rate / 100). For example, to add 18% GST to ₹1,000: GST = ₹1,000 × 18/100 = ₹180. Total = ₹1,180.
How to add 18% GST to 1000 rupees?+
GST amount = ₹1,000 × 18 ÷ 100 = ₹180. Total price including GST = ₹1,000 + ₹180 = ₹1,180. For intra-state transactions: CGST = ₹90 (9%) + SGST = ₹90 (9%). For inter-state: IGST = ₹180 (18%). Use the 'Add GST' mode in our GST calculator online free to compute this instantly.
What is the difference between CGST, SGST, and IGST?+
CGST (Central GST) and SGST (State GST) apply to intra-state transactions — when buyer and seller are in the same state. The GST is split equally: half to the Central Government (CGST) and half to the State Government (SGST). IGST (Integrated GST) applies to inter-state transactions across different states. The full GST is collected by the Centre and then apportioned to the destination state.
How to remove GST from price calculator — what is the formula?+
To remove GST from an inclusive price: Base Price = Inclusive Price ÷ (1 + GST Rate ÷ 100). Example: Remove 18% GST from ₹1,180. Base = ₹1,180 ÷ 1.18 = ₹1,000. GST embedded = ₹1,180 − ₹1,000 = ₹180. Use the 'Remove GST' mode in our GST inclusive exclusive calculator above.
What are the current GST rates in India?+
India's GST Council has defined five main GST rate slabs: 0% (exempt items like fresh vegetables, milk, eggs), 5% (essential goods — basic food, transport, healthcare), 12% (processed food, business-class flights, some construction materials), 18% (most services like restaurants with AC, financial services, IT services, manufactured goods), 28% (luxury and demerit goods — cars, tobacco, aerated drinks, casinos). Some special rates like 0.1%, 0.25%, 1.5%, 3%, 6%, 7.5% also exist for specific commodities.
What is GST inclusive vs GST exclusive?+
GST exclusive price (also called base price) is the price before GST is added. GST inclusive price is the final price that already includes GST. When a shopkeeper lists a product at ₹1,180 (GST inclusive at 18%), the actual base price is ₹1,000. Our GST inclusive exclusive calculator handles both directions — add GST to a base price, or extract the base price from an inclusive total.
Is Input Tax Credit (ITC) available on all GST payments?+
GST registered businesses can claim Input Tax Credit on GST paid for business purchases, reducing their overall GST liability. However, ITC is not available on certain items under GST regulations: personal use goods, motor vehicles (with exceptions), food, beverages, and club memberships. Always keep proper GST invoices (with GSTIN of supplier) to claim ITC.
How is the GST calculator online free useful for businesses?+
Our GST calculator India helps businesses: (1) Calculate correct invoice amounts for customers, (2) Verify GST amounts on vendor invoices, (3) Determine base price when only the GST-inclusive price is available, (4) Understand CGST/SGST vs IGST split based on transaction type, (5) Calculate Input Tax Credit amounts. All calculations comply with the standard GST calculation formula under CGST Act 2017.
Can I use this GST calculator for HSN-specific rates?+
Yes. Our GST calculator supports all Indian GST rates including 0.1%, 0.25%, 1%, 1.5%, 3%, 5%, 6%, 7.5%, 12%, 18%, and 28%. Simply type in any custom rate that applies to your specific HSN code or SAC code. The calculator works for all goods and services covered under India's GST regulations.

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