About this tool
This GST calculator helps you work out Goods and Services Tax on any amount in seconds — whether you're billing a client, checking an invoice, or estimating the final price of a purchase. Enter the amount, pick the applicable GST rate, and choose whether GST needs to be added on top (exclusive) or is already included in the price (inclusive). The tool instantly splits the tax into CGST and SGST for intra-state transactions.
Following the September 2025 GST reform, India moved to a simplified two-slab structure of 5% and 18%, with a 0% rate for essential items and a special 40% rate for luxury and sin goods. This calculator supports all current slabs so your numbers stay accurate for FY 2026-27 billing and compliance.
How to use it
- Enter the amount in the Amount field.
- Select the GST rate that applies to your goods or service (0%, 5%, 18%, or 40%).
- Choose whether the amount already includes GST (Include GST) or GST needs to be added (Exclude GST).
- Read off the CGST, SGST, total GST, and final amount instantly.
Frequently asked questions
What are the current GST rates in India?
Since the September 2025 GST reform, India uses a simplified structure: 0% for essential items, 5% and 18% as the two standard slabs for most goods and services, and a special 40% rate for luxury and sin goods like tobacco and high-end cars.
How is CGST and SGST calculated?
For a transaction within the same state, the total GST amount is split equally between CGST (collected by the central government) and SGST (collected by the state government). For example, on 18% GST, you'd see 9% CGST and 9% SGST.
How do I remove GST from a total amount?
Select 'Include GST', enter the final (tax-inclusive) amount, and pick the GST rate. The calculator extracts the original taxable value and shows you the exact GST amount that was charged.
Is this GST calculator free to use?
Yes, it's completely free with no signup, and every calculation runs instantly in your browser.
Does this calculator handle IGST for inter-state sales?
This version calculates CGST/SGST for intra-state supply. For inter-state transactions, the full GST rate applies as IGST rather than being split.