GST Calculator
Calculate GST (CGST + SGST) for any amount at any rate.
Parameters & Inputs
Calculated Breakdown
No calculation yet
Set your values on the left and click Calculate to view instantaneous results.
About GST Calculator
GST Calculator adds or removes Goods and Services Tax from an amount, showing the net price, the tax component and the gross total.
Removing GST is the case people get wrong: a 118 gross at 18% is not 100 minus 18%, it is 118 / 1.18 = 100.
How to use GST Calculator
- 1
Choose a direction
Add GST to a net amount, or extract GST from a gross amount.
- 2
Enter the rate
Common slabs are 5, 12, 18 and 28 percent.
- 3
Read the split
For intra-state sales the tax is shown as CGST + SGST halves; inter-state is a single IGST.
Questions about GST Calculator
How do I remove GST from a total?
Divide by (1 + rate/100). At 18%, 1180 becomes 1000 net with 180 tax.
Is GST charged on the discounted price?
Yes. Apply the discount first, then compute GST on the net amount.
What is the difference between CGST/SGST and IGST?
Intra-state sales split the rate between central and state. Inter-state sales use the full rate as IGST.
Does this work for VAT?
The arithmetic is identical; only the label and the rates differ by country.
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Last updated November 2026. Files are processed on FilePlume's own hardware and deleted within 60 minutes; nothing is used for training.