Add 18% GST
Input: Base amount: INR 1,000 at 18%
Output: GST INR 180, total INR 1,180
1000 x 0.18 = 180 tax, then 1000 + 180 = 1180.
GST calculator India
Enter an amount, pick a GST rate, and choose whether the amount includes GST or excludes GST.
- Base amount
- INR 0
- GST amount
- INR 0
- Total amount
- INR 0
- CGST (50%)
- INR 0
- SGST (50%)
- INR 0
Formula and algorithm
- Add GST: total = base x (1 + rate/100)
- Remove GST: base = total / (1 + rate/100)
- GST amount = total - base. For intra-state split, CGST = SGST = GST/2.
Worked examples
Remove 18% GST
Input: Total amount: INR 1,180 at 18%
Output: Base INR 1,000, GST INR 180
1180 / 1.18 = 1000 base amount.
Add 5% GST
Input: Base amount: INR 2,500 at 5%
Output: GST INR 125, total INR 2,625
2500 x 0.05 = 125, then 2625 total.
FAQ
Which GST rates are supported?
0%, 3%, 5%, 12%, 18%, and 28% are available in the selector.
Does this calculator decide tax applicability?
No. It only computes arithmetic after you pick the rate.
Why show CGST and SGST split?
For intra-state transactions, GST is commonly split equally into CGST and SGST.
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Updated: June 7, 2026