GST Calculator
Calculate GST amounts instantly for all Indian tax slabs. Supports inclusive & exclusive modes with CGST/SGST and IGST breakdown.
Amount
The entered amount does not include GST. We will add the tax.
GST Rate
Tax Type
For transactions within the same state. Tax is split equally into CGST and SGST.
Results
Enter an amount to calculate GST
How to Calculate GST Online
- 1
Enter the Amount
Type the product price or total amount into the input field. You can enter any value in Indian Rupees.
- 2
Select the GST Rate
Choose the applicable GST slab from the dropdown — 0%, 0.25%, 3%, 5%, 12%, 18%, or 28%. Pick the rate that matches your product's HSN code.
- 3
Choose Inclusive or Exclusive
Select whether your entered amount already includes GST (inclusive/reverse calculation) or is the base price before GST (exclusive).
- 4
Select State for Tax Split
Choose intra-state for a CGST + SGST breakdown (both buyer and seller in the same state) or inter-state for IGST calculation.
- 5
View Your Results
The calculator instantly displays the base amount, total GST, final amount, and the CGST/SGST or IGST split — ready for your invoice or billing.
Why Use Our GST Calculator?
All GST Slabs
Supports every standard Indian GST rate — 0%, 0.25%, 3%, 5%, 12%, 18%, and 28% — so you always get the right calculation.
Instant Results
Results update as you type. Switch between inclusive/exclusive modes and intra/inter-state in a single click.
100% Free
No signup, no ads, no limits. Use it as many times as you need for invoicing, billing, or tax planning.
Frequently Asked Questions
What is GST?
GST (Goods and Services Tax) is an indirect tax in India that replaced multiple taxes like VAT, excise duty, and service tax. It is levied on the supply of goods and services across India. GST has 4 main slabs: 5%, 12%, 18%, and 28%.
How to calculate GST on a product?
To calculate GST on a product, multiply the price by the GST rate divided by 100. For example, for a product priced at ₹1,000 with 18% GST: GST amount = ₹1,000 × 18/100 = ₹180. Total price = ₹1,000 + ₹180 = ₹1,180.
What is the difference between CGST, SGST, and IGST?
CGST (Central GST) and SGST (State GST) apply to intra-state transactions — the GST rate is split equally between the two. For example, 18% GST becomes 9% CGST + 9% SGST. IGST (Integrated GST) applies to inter-state transactions — the full GST rate goes to the central government.
How to calculate GST from total amount (inclusive)?
To reverse-calculate GST from a GST-inclusive amount, use the formula: GST Amount = Total Price × GST Rate / (100 + GST Rate). For example, if the total price is ₹1,180 and GST rate is 18%: GST = 1,180 × 18 / 118 = ₹180. The base price is ₹1,000.
Is this GST calculator free?
Yes, this GST calculator is 100% free to use. There is no signup required, no ads, and no usage limits. You can calculate GST amounts as many times as you need for invoicing, billing, or tax planning.
Which GST slab applies to my product?
The GST slab depends on the HSN (Harmonized System of Nomenclature) code of your product. Common rates: 5% for essential items, 12% for processed food and standard goods, 18% for most goods and services, and 28% for luxury and demerit items like automobiles and tobacco.
Related Free Tools
Explore more free tools built for Indian businesses.
Invoice Generator
Create professional GST invoices in seconds with automatic tax calculation.
Profit Margin Calculator
Calculate profit margins, markups, and break-even points for your products.
COD vs Prepaid Calculator
Compare cash-on-delivery vs prepaid economics and find your optimal mix.
Free QR Code Generator
Generate QR codes for UPI payments, URLs, text, and more — free and instant.
Built by StoreBase
Need a full online store?
Launch yours free on StoreBase — automatic GST invoicing, UPI & card payments, product catalog, and everything Indian businesses need to sell online.
Get started free