GST calculator

Work out GST in seconds. Add GST to a price, or find the price before GST from a total, with the CGST and SGST (or IGST) split shown for you.

Your price does not include GST yet. We add GST on top.

₹

10 thousand rupees

%

Tap a common rate or type any rate.

Total including GST

₹11,800.00

Price before GST
₹10,000.00
CGST @ 9%
₹900.00
SGST @ 9%
₹900.00
Total GST
₹1,800.00
Total including GST
₹11,800.00

How to use

  1. Choose "Add GST" if your price is before tax, or "Remove GST" if it already includes GST.
  2. Enter the amount in rupees.
  3. Tap a GST rate, or type any rate.
  4. Tick the box for a sale to another state to see IGST instead of CGST + SGST.

GST on ₹1,000.00 at common rates

GST rateCGST + SGSTGST amountTotal
5%2.5% + 2.5%₹50.00₹1,050.00
18%9% + 9%₹180.00₹1,180.00
40%20% + 20%₹400.00₹1,400.00

The GST formulas

Adding GST (price before tax):

GST = Amount × Rate ÷ 100  ·  Total = Amount + GST

Removing GST (price already includes tax):

Price before GST = Total × 100 ÷ (100 + Rate)  ·  GST = Total − Price before GST

A common mistake when removing GST

If a bill of ₹1,180.00 includes 18% GST, taking 18% off the total gives₹967.60, which is wrong. The 18% was added to the price before tax, not to the total. The correct price before GST is ₹1,000.00, and the GST is ₹180.00. Use "Remove GST" in the calculator to get this right every time.

CGST, SGST and IGST

  • Within one state: GST is split equally into CGST (central) and SGST (state). At 18%, that is 9% + 9%. In union territories without a legislature, UTGST replaces SGST.
  • Between states: the full rate is charged as IGST.

Current GST rate slabs

Since 22 September 2025, most items are taxed at 5% or 18%, with40% for luxury and sin goods. Gold and silver use a special 3% rate, and rough diamonds and some precious stones 0.25%. Many essentials are exempt.

GST rates and rules can change. This calculator is for quick estimates; for invoices and tax filing, confirm the rate for your item on the official CBIC website or with a tax professional.

Frequently asked questions

How do I add GST to a price?

Multiply the price by the GST rate and divide by 100, then add it to the price. For ₹1,000 at 18%: GST = 1,000 × 18 ÷ 100 = ₹180, so the total is ₹1,180.

How do I remove GST from a price that already includes it?

Divide the total by (100 + rate) and multiply by 100. For ₹1,180 including 18% GST: 1,180 × 100 ÷ 118 = ₹1,000 before GST, and the GST is ₹180. Simply taking 18% off the total gives the wrong answer.

What is the difference between CGST, SGST and IGST?

For a sale within the same state, GST is split equally: half is CGST (central) and half is SGST (state), so 18% becomes 9% + 9%. For a sale to another state, the full rate is charged as IGST (integrated GST).

What are the current GST rates?

Since 22 September 2025, most goods and services fall under 5% or 18%, with 40% for luxury and sin goods such as tobacco. Special rates include 3% for gold and silver and 0.25% for rough diamonds and some precious stones, and some essentials are exempt. Rates can change, so check the rate for your item on the official CBIC website.

Is this calculator free?

Yes, completely free with no sign-up. The calculation happens on your device.

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