Tax
GST Calculator
Instantly add GST to any amount or extract the GST already included in a gross price. Splits into CGST + SGST too.
GST inputs
Mode
Standard GST slabs
18%Total (incl. GST)
₹1,180
- Base amount
- ₹1,000
- GST @ 18%
- ₹180
- CGST
- ₹90
- SGST / UTGST
- ₹90
9%
9%
For inter-state supplies, GST is charged as IGST at the full rate instead of CGST + SGST.
Amount split
- Base
- GST
Total: ₹1.2K
Formula
How the math works
Add: GST = amount × rate/100. Remove: base = gross ÷ (1 + rate/100)
- amount
- Your input amount
- rate
- GST rate in % (0/3/5/12/18/28)
- CGST/SGST
- For intra-state supplies each = GST/2
Method
How it works
- 1
Choose “Add” to compute GST on top of a base amount, or “Remove” to peel GST out of a gross figure.
- 2
Type the amount and pick one of India’s six standard GST slabs — or set a custom rate.
- 3
CalcPe shows base, GST, CGST and SGST breakdown.
Worked example
A quick walkthrough
Inputs
₹5,000 invoice value at 18% GST, mode = add.
Steps
- GST = 5,000 × 18 / 100 = ₹900
- Total = 5,000 + 900 = ₹5,900
- CGST = ₹450, SGST = ₹450
Result
Total ₹5,900 with ₹450 CGST + ₹450 SGST.
Why use it
Why CalcPe’s GST Calculator
- Instantly split any invoice into base + GST components.
- Reverse-engineer the base amount from a gross MRP.
- Correct CGST/SGST split for intra-state supply (or full IGST for inter-state).
- Handy for freelancers, shopkeepers, accountants and consumers.
FAQ
Frequently asked questions
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