How to use the GST Calculator
- Enter the amount.
- Pick a GST rate or type a custom one.
- Choose Add GST or Remove GST.
- Choose within state or between states to see the split.
Features
Add or remove GST
Works for both exclusive and inclusive prices.
CGST, SGST and IGST
See the split for intra-state and inter-state supply.
Any rate
Quick buttons for common slabs, plus a custom rate field.
Instant
Results update as you type.
GST formulas
Adding GST: GST = Amount × Rate ÷ 100, and Total = Amount + GST.
Removing GST: Base = Total × 100 ÷ (100 + Rate), and GST = Total − Base.
For supply within a state the GST is split equally into CGST and SGST. For supply between states the whole amount is IGST.
Which GST rate applies?
GST rates in India were restructured in 2025 into main slabs of 5% and 18%, with a higher 40% rate for specified goods, while some items carry special rates such as 3% or 0.25%. Rates depend on the exact product or service and its HSN or SAC code, so always confirm the current rate on the official GST portal or with a tax professional.
Frequently asked questions
How do I calculate GST on an amount?
Enter the amount, choose the rate and select Add GST. The calculator shows the GST and the total.
How do I remove GST from a total price?
Enter the total, choose the rate and select Remove GST to see the base price and tax.
What is the difference between CGST, SGST and IGST?
CGST and SGST apply to sales within a state and are split equally. IGST applies to sales between states.
Are the rate buttons up to date?
They cover common slabs. Rates can change, so use the custom rate field and verify the applicable rate for your item.
Is this tax advice?
No. It is a calculator. Consult a qualified professional for tax decisions.