GST Calculator
Add or remove GST at any rate and see the CGST/SGST split.
1,000
Net (before tax)
180
GST amount
1,180
Gross (after tax)
Tax breakdown
| CGST (9%) — intra-state | 90 |
| SGST (9%) — intra-state | 90 |
| IGST (18%) — inter-state | 180 |
Formula used: GST = net × rate ÷ 100; gross = net + GST
About GST Calculator
Goods and Services Tax is charged as a percentage of the taxable value, and the everyday confusion is whether a quoted price already includes it.
This calculator works in both directions - adding tax to a net price or extracting it from a gross price - and breaks the result into CGST, SGST or IGST for invoicing.
Frequently asked questions
What is the reverse GST formula?
To strip tax from an inclusive price, divide by (1 + rate/100). The difference is the tax component.
How is CGST and SGST split?
For intra-state supply the total is split equally between central and state GST. Inter-state supply uses a single IGST at the full rate.
Which rates are supported?
The standard slabs of 0, 5, 12, 18 and 28 percent, plus any custom rate you enter.