How do I calculate GST from the total amount?

To extract GST from a GST-inclusive price, use the formula: GST Amount = Total × (GST Rate ÷ (100 + GST Rate)). For example, if your total is ₹1,180 with 18% GST, the calculation would be: GST = 1,180 × (18 ÷ 118) = ₹180, and the base price would be ₹1,000.

What is the difference between CGST and SGST?

CGST (Central GST) and SGST (State GST) are components of GST charged on intra-state transactions (within the same state). The total GST is split equally between the central government (CGST) and state government (SGST). For example, 18% GST becomes 9% CGST + 9% SGST. For inter-state transactions, IGST (Integrated GST) is charged instead.

What are the current GST rates in India?

India has multiple GST slabs: 0% for essential goods like milk and fresh vegetables; 5% for basic necessities like sugar and tea; 12% for processed foods and standard goods; 18% for most goods and services (the most common rate); and 28% for luxury items like automobiles and cement. Some goods also have special rates of 0.25% (rough diamonds) and 3% (gold and precious metals).

When is IGST charged instead of CGST and SGST?

IGST (Integrated Goods and Services Tax) is charged on inter-state transactions, meaning when the supplier and buyer are in different states. For intra-state transactions (supplier and buyer in the same state), CGST and SGST are charged. IGST is collected entirely by the central government and later distributed between central and state governments.

How do I add GST to a price?

To add GST to a base price, use the formula: Total Amount = Base Amount × (1 + GST Rate ÷ 100). For example, to add 18% GST to ₹1,000: Total = 1,000 × 1.18 = ₹1,180. The GST amount alone would be ₹180.

Is the GST calculator free to use?

Yes, this GST calculator is completely free to use with no registration required. You can calculate GST for unlimited transactions, access all features including CGST/SGST/IGST breakdowns, custom rate entry, and visual charts without any cost.

What is GST-inclusive vs GST-exclusive?

GST-exclusive means the GST is not included in the stated price and will be added on top. GST-inclusive means the GST is already included in the price. For example, if an item costs ₹1,000 GST-exclusive at 18%, you pay ₹1,180 total. If it's ₹1,180 GST-inclusive at 18%, the base price is ₹1,000 and GST is ₹180.

Can I use this calculator for countries other than India?

Yes, this calculator supports GST calculations for multiple countries including India, Australia (10% GST), Singapore (9% GST), New Zealand (15% GST), and Malaysia (SST system). You can enter custom GST rates for any country that uses a goods and services tax system.

How accurate is the GST calculator?

The GST calculator provides accurate results following official rounding rules specified in Section 170 of the CGST Act. It rounds GST amounts to two decimal places and handles edge cases like zero-rated goods correctly. However, for official tax filing purposes, always verify calculations with a qualified tax professional.

Do I need to register for GST in India?

In India, businesses with an annual turnover exceeding ₹40 lakhs (₹20 lakhs for special category states) must register for GST. E-commerce operators and certain service providers must register regardless of turnover. Registration is done online through the GST portal using your PAN, business details, and address proof.

GST Calculator Online - Free India CGST SGST IGST Calculator 2025

GST Calculator - Calculate Goods and Services Tax Online

Calculate GST instantly with our free online calculator. Get accurate CGST, SGST, and IGST breakdowns, add or remove GST from any amount, and access custom rate calculations for India, Australia, Singapore, and more—all in seconds.

CGST/SGST/IGST

Auto split by state type

Breakdown + invoice

Clear split + multi-item totals

Inclusive / Exclusive

Switch modes instantly

Custom rates

0-100% with validation

Description

Qty

Price

GST %

Total

₹11,800.00

GST: 1,800.00

How to Use the GST Calculator

Step 1: Enter Your Amount
Type the base price (GST-exclusive) or final price (GST-inclusive) in the amount field. Enter values up to ₹999,999,999,999.99.

Step 2: Select GST Rate
Choose from preset rates (5%, 12%, 18%, 28% for India) or enter a custom rate (0-100%) for other countries or special cases.

Step 3: Choose Calculation Type
Toggle between:

GST Exclusive: Add GST to your base amount
GST Inclusive: Extract GST from your total amount

Step 4: Select Transaction Type (India only)
Choose:

Intra-State: Same state transaction (shows CGST + SGST breakdown)
Inter-State: Different state transaction (shows IGST)

Step 5: View Results
Your results appear instantly with:

Total GST Amount
Base/Net Amount
Final Amount
CGST/SGST or IGST breakdown

Pro Tip: Click the copy icon next to any result to instantly copy it to your clipboard for invoices or documentation.

What is GST?

Goods and Services Tax (GST) is a comprehensive, multi-stage, destination-based indirect tax levied on the supply of goods and services. It replaced multiple cascading taxes like VAT, service tax, excise duty, and state levies to create a unified taxation system.

GST Implementation Around the World

India introduced GST on July 1, 2017, revolutionizing the country's indirect tax structure. The Indian GST model is unique with three components: CGST (Central GST) collected by the central government, SGST (State GST) collected by state governments for intra-state supplies, and IGST (Integrated GST) for inter-state transactions.

Australia implemented a 10% GST on July 1, 2000, replacing the federal wholesale sales tax system. Australian GST is simpler than India's model, with a single flat rate and exemptions for basic food, healthcare, and education.

Singapore first introduced GST in 1994 at 3%, gradually increasing to the current 9% (as of January 2024). Singapore's GST system is known for its efficiency and high compliance rates.

New Zealand was the pioneer, implementing GST at 10% in 1986, now at 15%. It's considered one of the most comprehensive GST systems globally, with minimal exemptions.

Malaysia had GST from April 2015 to May 2018 at 6% before reverting to the Sales and Services Tax (SST) system with separate rates for sales tax (5-10%) and service tax (6%).

Why GST Matters

GST eliminates the "tax on tax" cascading effect, where taxes paid at earlier stages of production couldn't be claimed as credits. This reduces the overall tax burden, simplifies compliance, and makes products more competitive. For businesses, GST creates a unified market across regions, eliminating border checkpoints and interstate tax complications.

How to Calculate GST: Complete Formula Guide

Understanding GST calculations is crucial for accurate invoicing, tax filing, and financial planning. Here are the essential formulas with practical examples.

Formula 1: Adding GST (Exclusive)

GST Amount = Base Amount × (GST Rate ÷ 100)

Total Amount = Base Amount + GST Amount

Example: selling a laptop for ₹50,000 at 18% GST.
GST = 50,000 × 0.18 = ₹9,000
Total = 50,000 + 9,000 = ₹59,000

Formula 2: Removing GST (Inclusive)

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

GST Amount = Total Amount - Base Amount

Example: paid ₹5,900 (inclusive) at 18% GST.
Base = 5,900 ÷ 1.18 = ₹5,000
GST = 5,900 - 5,000 = ₹900

Formula 3: CGST and SGST Split (India Intra-State)

For transactions within the same state in India:
CGST = Total GST Amount ÷ 2
SGST = Total GST Amount ÷ 2

Formula 4: IGST (India Inter-State)

For transactions between different states:
IGST = Total GST Amount

Step-by-Step GST Calculation Guide

Scenario 1: Calculating Invoice Total (Adding GST)

Situation: You're a freelance graphic designer in Bangalore billing a local client for services worth ₹25,000. GST rate for design services is 18%.

Step 1: Identify base amount = ₹25,000
Step 2: Determine GST rate = 18%
Step 3: GST = 25,000 × 0.18 = ₹4,500
Step 4: CGST = ₹2,250, SGST = ₹2,250
Step 5: Total = 25,000 + 4,500 = ₹29,500

Scenario 2: Finding Original Price (Removing GST)

Situation: You bought office supplies for ₹8,260 (total bill) with 18% GST. You need to know the actual product cost.

Step 1: Identify total amount = ₹8,260
Step 2: Determine GST rate = 18%
Step 3: Base = 8,260 ÷ 1.18 = ₹7,000
Step 4: GST = 8,260 - 7,000 = ₹1,260

GST Rates: Complete Breakdown by Country

India GST Rate Structure

India operates a multi-tiered GST system with different rates for various categories:

Nil Rate (0%): Essential food items, Healthcare, Educational services.
0.25% GST: Rough diamonds and precious stones.
3% GST: Gold, silver, and platinum.
5% GST: Basic necessities, Common services, Coal, medicines.
12% GST: Processed foods, Standard goods (mobiles, computers), Business class air travel.
18% GST (Most Common): IT services, consulting, Biscuits, soaps, Capital goods.
28% GST (Luxury Category): Luxury items, Sin goods (Tobacco), Consumer durables (ACs).

Australia GST

Standard Rate: 10%. Applied to most goods. 0% for basic food, healthcare, education.

Singapore GST

Current Rate: 9% (as of 2024). Applied uniformly. 0% for exports.

New Zealand GST

Standard Rate: 15%. Comprehensive coverage with minimal exemptions.

Malaysia (SST)

Sales Tax: 5-10%. Service Tax: 6%.

Practical Tips for GST Calculation

1. Use the Right Formula: Before invoicing? Use GST-exclusive. After receiving a bill? Use GST-inclusive.

2. Round Correctly: In India, round tax components to 2 decimals for invoices, and to the nearest rupee for tax liability (Section 170 CGST Act).

3. Verify GST Numbers: Ensure valid GSTIN before claiming Input Tax Credit.

4. Understand Place of Supply: Determines IGST vs CGST+SGST.

5. Track Input Tax Credit: Claim ITC on business expenses, but know blocked credits (personal use, food, etc.).

GST Calculator - Calculate Goods and Services Tax Online

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