How is GST calculated in India?

GST is calculated as a percentage of the taxable value. For 18% GST on ₹1,000: GST = ₹180, total = ₹1,180. For intra-state it splits into CGST + SGST (9% each). For inter-state the full 18% is charged as IGST.

What are the GST rate slabs in India?

India has 5 GST slabs: 0% (essential items), 5% (basic necessities), 12% (processed food, computers), 18% (most services and goods), 28% (luxury items like cars, ACs).

What is GST inclusive vs GST exclusive?

GST exclusive: tax is added on top of the price. GST inclusive: tax is already included in the shown price. For ₹1,180 inclusive at 18%: taxable value = ₹1,000, GST = ₹180.

When to charge CGST+SGST vs IGST?

Charge CGST+SGST when buyer and seller are in the same state. Charge IGST when they are in different states or for exports.

Is GST applicable on all goods and services?

Most goods and services attract GST but some are exempt: fresh vegetables, milk, eggs, healthcare, and education. Petroleum and alcohol are outside GST.

Free Tool

Free GST Calculator India — CGST, SGST & IGST

Calculate GST instantly for any amount. Get CGST/SGST breakdown for intra-state and IGST for inter-state transactions. All 5 GST slabs supported.

Enter Amount (₹)

GST Rate

Calculation Type

Transaction Type

Taxable Amount:₹0.00

CGST (9%):₹0.00

SGST (9%):₹0.00

Total Invoice Value:₹0.00

GST Rate Reference 2026

GST Rate	Common Items	Examples
0%	Essential goods	Fresh vegetables, milk, eggs, salt, books
5%	Basic necessities	Packaged food, footwear under ₹1,000, edible oils, medicines
12%	Standard goods	Computers, mobiles, processed food, butter, ghee
18%	Most goods & services	Restaurant food, IT services, telecom, CCTV, paint
28%	Luxury & sin goods	Cars, motorcycles, ACs, tobacco, cement

Understanding GST Calculation in India

The Goods and Services Tax (GST) is a crucial indirect tax levied on the supply of goods and services across India. For Indian business owners, ensuring accurate GST calculation is not just about compliance—it is essential for protecting profit margins and facilitating seamless Input Tax Credit (ITC) for your buyers. With our free online calculator, you can instantly determine the exact taxable value and tax components for your invoices.

How to Calculate GST Step by Step

Calculating GST correctly means knowing whether the price you are starting with is GST Exclusive or GST Inclusive. For example, if you sell a product for ₹5,000 (exclusive of 18% GST), the calculation is straightforward: ₹5,000 × 18% = ₹900. Your final invoice value becomes ₹5,900. However, if you want your final price to definitely be ₹5,000 (inclusive of 18% GST), the math steps backward: ₹5,000 / 1.18 = ₹4,237.28. The remaining ₹762.72 is your collected GST.

CGST vs SGST vs IGST

When generating an invoice, determining the correct tax bucket is legally vital. If the buyer and the seller reside in the same state (Intra-state), the total GST rate is split equally into Central GST (CGST) and State GST (SGST). For example, an 18% rate becomes 9% CGST and 9% SGST. Conversely, if you are selling to a customer outside your state (Inter-state), the entire 18% is captured dynamically under Integrated GST (IGST).

Common Mistakes & How Udyog Helps

Manual tax calculation frequently leads to rounding errors, selecting the wrong HSN code rate slab, or mistakenly applying CGST/SGST on an inter-state sale. These minor mathematical missteps can lead to massive compliance penalties during auditing. Fortunately, modern automated software solves this. When you use Udyog Billing Software, you never have to calculate GST manually again. Udyog automatically reads the state code from the buyer's GSTIN, computes the exact inclusive or exclusive values, and generates a flawless, compliant invoice in just 8 seconds.

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