GST Calculator
Add or remove GST from any amount. Supports all Indian GST slabs
GST Calculation
GST Breakdown
About GST Calculator
Our GST calculator helps you compute Goods and Services Tax for all Indian GST slabs (0%, 3%, 5%, 12%, 18%, 28%). Perfect for businesses, accountants, and consumers to calculate tax on purchases, sales, and invoices.
The calculator supports both Add GST (calculate tax on original price) and Remove GST (extract original price from GST-inclusive amount), plus intra-state (CGST+SGST) and inter-state (IGST) transactions.
How to Use This GST Calculator
Step 1: Enter the amount (price of product/service).
Step 2: Select the GST rate (0%, 3%, 5%, 12%, 18%, or 28%).
Step 3: Choose calculation type — Add GST (tax on original) or Remove GST (extract from total).
Step 4: Select transaction type — Intra-State (CGST+SGST) or Inter-State (IGST).
Step 5: Click "Calculate GST" to see the tax breakdown.
Step 6: Use the Reset button to clear all inputs and calculate a different scenario.
Why Use a GST Calculator?
✓ Business Invoicing
Generate accurate GST invoices for customers. Calculate CGST, SGST, or IGST correctly based on transaction type.
✓ Tax Compliance
Ensure correct GST calculation for GST return filing (GSTR-1, GSTR-3B). Avoid penalties for incorrect tax calculation.
✓ Input Tax Credit
Calculate GST on purchases to claim input tax credit. Reduce your net GST liability legally.
✓ Price Comparison
Compare GST-inclusive vs GST-exclusive prices. Know the actual tax you're paying as a consumer.
GST Rate Slabs by Category
| GST Rate | Product / Service Category |
|---|---|
| 0% | Fresh milk, eggs, vegetables, bread, salt, books, healthcare, education |
| 3% | Gold, silver, precious metals, jewellery |
| 5% | Packed food, tea, coffee, edible oil, sugar, medicine, railway tickets |
| 12% | Processed food, butter, ghee, dry fruits, cell phones, Ayurvedic medicines |
| 18% | Soaps, hair oil, toothpaste, AC, fridge, washing machine, computers, restaurant bills, telecom, financial services |
| 28% | Cars (+1-22% cess), tobacco, aerated drinks, high-end motorcycles, luxury goods |
GST Registration Thresholds (India)
| Category | Threshold Limit |
|---|---|
| Goods (Normal States) | ₹40 lakhs |
| Goods (Special Category States) | ₹20 lakhs |
| Services | ₹20 lakhs |
| Special Category States (Services) | ₹10 lakhs |
*Special category states: Himachal Pradesh, Uttarakhand, North-Eastern states, Jammu & Kashmir
GST Formula
Add GST
GST Amount = Original Price × (GST Rate ÷ 100)
Total Price = Original Price + GST Amount
Remove GST
Original Price = Total Price ÷ (1 + GST Rate ÷ 100)
GST Amount = Total Price - Original Price
GST Return Filing Guide
| Return Form | Due Date | Details |
|---|---|---|
| GSTR-1 | 11th of next month | Outward supplies (sales) |
| GSTR-3B | 20th of next month | Monthly summary return |
| GSTR-9 | December 31st | Annual return |
| CMP-08 | 18th of next month | Composition scheme |
Frequently Asked Questions
Built and maintained by Sanjay Singh · Founder, Numrexo
Builds and maintains the calculators on Numrexo. Each tool's formula is documented on its page, and any reference source it relies on is listed under Method and references.
Last updated: · Calculations run in your browser. Nothing you enter is sent to us or stored.
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