GST Calculator – Calculate GST, CGST, SGST, and IGST Instantly
GST (Goods and Services Tax) is a crucial part of modern taxation systems, especially in countries like India. Whether you're a business owner, accountant, student, or consumer, calculating GST manually can be confusing and time-consuming. Our GST Calculator helps you compute GST amount, total price, tax-exclusive price, tax-inclusive price, and split GST values (CGST, SGST, and IGST) instantly — all with a single click.
If your input contains extra spaces or unwanted formatting, clean it using Remove Extra Spaces. For generating random test values, try Random Number Generator.
What Is GST?
GST is an indirect tax applied on the supply of goods and services. It replaces multiple tax systems such as VAT, service tax, excise duty, etc. GST is divided into:
- CGST: Central GST (applied by the central government)
- SGST: State GST (applied by the state government)
- IGST: Integrated GST (applied on interstate transactions)
In most cases, CGST and SGST are split equally from the total GST percentage. For example, 18% GST = 9% CGST + 9% SGST.
Why Use an Online GST Calculator?
Calculating GST manually can lead to errors, especially when dealing with price-inclusive GST, multiple slabs, or business invoices. An online GST Calculator helps you:
- Avoid calculation mistakes in business billing.
- Save time with instant GST results.
- Understand price breakdown for any product or service.
- Simplify accounting for invoices and returns.
- Calculate both GST-inclusive and exclusive prices.
If you need percentage-based calculations, use Percentage Calculator.
GST Slabs Supported
Our GST Calculator supports all major GST slabs used in billing and business calculations:
- 5%
- 12%
- 18% (most common)
- 28%
Custom GST values can also be entered for advanced billing scenarios.
Types of GST Calculations Supported
The GST Calculator supports both forward and reverse GST calculations:
- GST Exclusive Calculation: Calculate GST amount and final price when GST is added.
- GST Inclusive Calculation: Calculate base price and GST amount when price already includes tax.
- GST Breakdown: Separate total GST into CGST and SGST.
- IGST Calculation: For interstate goods and service transactions.
- Custom GST Percentage: Enter your own GST rate.
If you want to format outputs or generate JSON-based billing data, use JSON Formatter & Minifier.
How GST Calculations Work
GST depends on whether the price already includes tax or not. Here’s the basic formula:
1. GST Exclusive (Add GST)
Final Price = Original Price + GST Amount GST Amount = (Original Price × GST %) ÷ 100
2. GST Inclusive (Remove GST)
Original Price = (Final Price × 100) ÷ (100 + GST %) GST Amount = Final Price − Original Price
For CGST and SGST split: Each = GST Amount ÷ 2
Our tool performs these calculations instantly to give fully accurate results.
Main Features of Our GST Calculator
This calculator is perfect for customers, shopkeepers, accountants, business owners, and tax professionals. Features include:
- Instant GST Calculation: Results appear immediately.
- Supports All GST Slabs: 5%, 12%, 18%, 28%, custom.
- CGST/SGST Split: Automatically divides GST into equal parts.
- IGST Support: One-click interstate GST calculation.
- GST Inclusive & Exclusive: Calculate both types easily.
- User-Friendly Design: Clean interface for all users.
- No Installation: 100% browser-based.
- Mobile Friendly: Works on phones, tablets, and desktops.
- Free & Unlimited: No sign-up required.
If you need a simple calculator for basic math, try Simple Calculator.
How to Use the GST Calculator (Step-by-Step Guide)
Follow these easy steps:
- Enter the original price or tax-inclusive price.
- Select the GST percentage.
- Choose between “GST Inclusive” or “GST Exclusive.”
- Click “Calculate” to get results.
- The tool displays GST amount, final price, CGST, SGST, and IGST.
If your input contains wrong formatting like “1000 18%”, fix it using Remove Extra Spaces.
Common Uses of the GST Calculator
The GST Calculator is used in many fields:
- Shops & Retail Stores: Add GST to product prices.
- Business Owners: Create tax invoices.
- Freelancers: Calculate GST for service charges.
- Students: Understand GST concepts.
- Customers: Check the GST on bills and receipts.
- E-commerce Sellers: Calculate GST-inclusive product pricing.
- Accountants: Simplify GST breakdown and reporting.
Frequently Asked Questions (FAQs)
1. Is the GST Calculator free?
Yes — it is 100% free and available without registration.
2. Can I calculate GST-inclusive price?
Yes — the tool supports both inclusive and exclusive calculations.
3. Does the tool support CGST, SGST, and IGST?
Yes — it provides a complete GST breakdown.
4. Can I enter decimal values?
Yes — the calculator supports decimal inputs like 1999.50.
5. Does it store my data?
No — all calculations occur locally in your browser.
Conclusion
Our GST Calculator provides a fast, easy, and reliable way to calculate GST, total price, GST amount, CGST, SGST, and IGST. Whether you are billing customers, checking product prices, or learning how GST works, this tool delivers accurate results instantly. For more useful tools, explore Percentage Calculator, Simple Calculator, or Remove Extra Spaces. Calculate GST instantly — simple, accurate, and completely free!