GST Calculator
Add or remove GST at any rate, with the CGST/SGST/IGST split.
Total including GST
11,800.00
GST at 18%
Taxable value
10,000.00
Total GST
1,800.00
CGST
900.00
9%
SGST
900.00
9%
Invoice total
11,800.00
GST = amount × 18 ÷ 100 = 1,800.00
- Intra-state supply splits the rate evenly between Central and State GST.
- GST rates are revised by the GST Council. Confirm the current rate for your HSN or SAC code before invoicing.
What does GST Calculator do?
Calculate GST on any amount at 0.25%, 3%, 5%, 12%, 18% or 28%, or a custom rate. Works in both directions — add GST to a net amount, or extract the GST already included in a gross amount — and splits the tax into CGST, SGST and IGST for invoicing.
How to Use GST Calculator
- 1Enter the amountEither the net price or the GST-inclusive price.
- 2Choose add or removeAdd GST calculates forward; remove GST works backwards.
- 3Pick the GST rateTap a standard slab or type a custom percentage.
- 4Choose the supply typeIntra-state splits into CGST and SGST; inter-state uses IGST.
Key Features
- Add GST to a net price or strip GST out of a GST-inclusive price
- One-tap rate buttons for the standard slabs plus a custom rate field
- Automatic CGST and SGST split for intra-state supply
- IGST shown in full for inter-state supply
- Quantity support so you can total a line item straight into an invoice
Frequently Asked Questions
How do I remove GST from a total?
Divide the gross amount by (1 + rate ÷ 100). For ₹1,180 including 18% GST: 1180 ÷ 1.18 = ₹1,000 net, so the GST is ₹180. Simply taking 18% of ₹1,180 gives ₹212.40, which is wrong.
What is the difference between CGST, SGST and IGST?
For a supply within one state the tax is split evenly between Central GST and State GST — 18% becomes 9% CGST plus 9% SGST. For a supply between states the whole 18% is charged as Integrated GST.
What are the standard GST rates in India?
The main slabs are 5%, 12%, 18% and 28%, with 0.25% and 3% used for rough gemstones and gold. Rates are revised by the GST Council, so confirm the current rate for your HSN or SAC code before invoicing.
Can I use this for VAT in other countries?
Yes. The arithmetic for adding and removing a value-added tax is identical; just enter your local rate and ignore the CGST/SGST split.
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