EpiFive
All free tools

GST calculator: add or remove GST

Choose whether your amount is before or after GST, pick the rate, and get the GST amount, the total and the CGST/SGST or IGST split, ready to copy into an invoice or quote.

Runs in your browser. The amounts you enter are not sent to or stored by EpiFive.

यह पेज हिंदी में पढ़ें: GST कैलकुलेटर

What do you have?
GST rate
Supply type
Amount before GST₹10,000.00
GST @ 18%₹1,800.00
Total amount₹11,800.00
CGST @ 9%₹900.00
SGST / UTGST @ 9%₹900.00

How to use it

  1. Pick Price without GST if you want to add tax, or Price with GST if the amount already includes it (an MRP or a bill total).
  2. Type the amount and choose the rate. Use Other for rates such as 0.25% or 1.5%.
  3. Choose Within the state for CGST + SGST, or Between states for IGST.
  4. Copy the breakdown into your invoice, quotation or WhatsApp message.

The formulas

  • Adding GST: GST = amount × rate ÷ 100; total = amount + GST.
  • Removing GST: base = amount × 100 ÷ (100 + rate); GST = amount − base.
  • CGST = SGST = GST ÷ 2. IGST = the full GST.

GST added to and included in common amounts, with the CGST, SGST and IGST split. All GST tables.

  • Percentage calculator: X% of Y, X is what percent of Y, and percentage increase or decrease, with the working shown.
  • EMI calculator: Monthly EMI, total interest and a year-by-year repayment table for home, car and personal loans.
  • FD calculator: Fixed deposit maturity amount and interest earned, compounded quarterly like Indian banks.
  • QR code generator: QR codes for links, text, Wi-Fi and UPI payments, as PNG or SVG. No sign-up, no expiry.

Related guides

Questions people ask

How do I add GST to a price?

Multiply the price by the rate and add it: GST = price × rate ÷ 100. For ₹1,000 at 18%, GST is ₹180 and the total is ₹1,180. Within a state that ₹180 is split into ₹90 CGST and ₹90 SGST.

How do I remove GST from an inclusive amount?

Divide by (100 + rate) and multiply by 100: base = amount × 100 ÷ (100 + rate). For ₹1,180 including 18% GST, the base is ₹1,000 and the GST is ₹180. Do not simply take 18% off ₹1,180; that gives the wrong answer.

What are the GST rates now?

Since 22 September 2025 (GST 2.0), most goods and services are taxed at 5% or 18%, with 40% for luxury and sin goods such as pan masala, aerated drinks and large cars. The 12% and 28% slabs were removed for most items; the calculator keeps them for older invoices. Special rates such as 3% on gold still apply. Check the CBIC rate notifications for your HSN or SAC code.

When do I charge CGST + SGST and when IGST?

For a sale within the same state (intra-state), you charge CGST and SGST, each at half the rate. For a sale to another state (inter-state) or an export, you charge IGST at the full rate. Union territories without a legislature use UTGST instead of SGST.

Is GST charged on the discounted price?

Yes, when the discount is shown on the invoice at the time of sale. GST is calculated on the transaction value after that discount.