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GST Calculator – Add or Remove GST and Sales Tax

Enter an amount, pick a rate and choose whether the amount includes tax. You get the net amount, the tax and the total, with a CGST and SGST or IGST split for India.

Tax system

The amount I have

Tax rate

Type of sale

Enter an amount to see the tax breakdown.

Rates follow the GST slabs in force since 22 September 2025 (5%, 18% and 40%, with 3% for gold and jewellery). Check the rate for your item's HSN/SAC code before invoicing.

How to calculate GST

  1. Choose the tax system: India GST, Pakistan sales tax or Custom.
  2. Enter the amount.
  3. Say what the amount is: "Excludes tax" to add tax on top, or "Includes tax" to work out how much of a total is tax.
  4. Pick the tax rate, or choose "Other rate" and type your own.
  5. For India, choose the type of sale: within the state (CGST + SGST) or to another state (IGST).
  6. Read the breakdown of the amount before tax, the tax and the total with tax, and press "Copy breakdown" to paste it into an invoice, message or spreadsheet.

Features

  • Add or remove tax from any amount.
  • India GST presets for 3%, 5%, 18% and 40%.
  • CGST and SGST split for sales within a state, and IGST for sales between states.
  • Pakistan sales tax preset at 18%, with any provincial rate entered as a custom rate.
  • Custom rates for VAT and other sales taxes.
  • One-click copy of the full breakdown.
  • Results as you type, in any currency.

The formulas, with worked examples

Adding tax (amount excludes tax): tax = amount × rate ÷ 100, and total = amount + tax. A product priced at 1,000 with 18% GST has 180 of tax and a total of 1,180. Within a state, that 180 is shown as CGST 9% = 90 and SGST 9% = 90. To another state, it is IGST 18% = 180.

Removing tax (amount includes tax): amount before tax = total ÷ (1 + rate ÷ 100), and tax = total − amount before tax. A bill of 1,180 that includes 18% GST contains 1,000 of value and 180 of tax.

Pakistan example: goods worth 50,000 before tax, at 18% sales tax, carry 9,000 of tax, for a total of 59,000.

Common mistakes to avoid

  • Taking the rate off a tax-inclusive total. 18% of 1,180 is 212.40, but the GST inside 1,180 is only 180. Use "Includes tax" whenever the price you have already contains tax.
  • Charging the wrong split. A sale within your own state is billed as CGST and SGST in equal halves. A sale to a customer in another state is billed as IGST at the full rate. The total tax is the same, but the invoice must show the correct type.
  • Using an old rate. India's slabs changed on 22 September 2025, and many items moved from 12% or 28% to 5%, 18% or 40%. Check the current rate for your HSN or SAC code rather than relying on an old invoice.
  • Mixing up goods and services in Pakistan. Goods usually carry federal sales tax, while services are taxed by the province where they are provided, at that province's rate.

Why use Fileora's GST calculator

Shopkeepers, freelancers and small businesses often need a quick answer: what to charge, how much tax is inside a price, or how to split GST on an invoice. Taking the rate off a tax-inclusive total is one of the most common mistakes, and this calculator uses the correct reverse formula.

It's free, needs no sign-up and works on a phone at the counter. Your figures stay on your device.

When you're ready to bill, the invoice generator creates a clean PDF invoice in your browser. For discounts and mark-ups, use the percentage calculator.

Rates change and depend on the exact goods or service, so treat these results as estimates rather than tax advice, and check with a tax adviser or the official rate schedule. Read our disclaimer for more.

Frequently asked questions

How do I add GST to a price?

Multiply the price by the rate and divide by 100 to get the tax, then add it to the price. For 1,000 at 18%, the GST is 1,000 × 18 ÷ 100 = 180, and the total is 1,180. Choose "Excludes tax (add tax)" and the calculator does this for you.

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

Divide the total by 1 plus the rate as a decimal. For 1,180 including 18% GST, the price before tax is 1,180 ÷ 1.18 = 1,000, and the GST is 180. Taking 18% of 1,180 would give 212.40, which is wrong, because the tax was charged on 1,000, not on 1,180.

What are the GST rates in India?

Since 22 September 2025, the main GST slabs are 5% and 18%, with 40% for a small group of luxury and sin goods and 3% for gold and jewellery. Some items are exempt. Always check the rate for your item's HSN or SAC code before you issue an invoice.

When do I use CGST and SGST, and when IGST?

For a sale within the same state, GST is split equally between central tax (CGST) and state tax (SGST), so 18% becomes 9% + 9%. For a sale to another state, the full rate is charged as integrated tax (IGST). Pick the type of sale and the calculator shows the right split.

What is the sales tax rate in Pakistan?

The standard federal sales tax on goods is 18%. Sales tax on services is set by each province, and the rates differ, for example 15% or 16%. For a service, choose "Other rate" and enter the rate that applies to you.

Can I use it for VAT or other countries' sales tax?

Yes. Choose Custom and pick 5%, 10%, 15% or 20%, or enter any rate between 0% and 100% under "Other rate". The add and remove formulas are the same for VAT, GST and most other percentage-based taxes.

Is the amount I enter stored anywhere?

No. The calculation runs in your browser and nothing is sent to a server. The copy button only copies the breakdown to your own clipboard.

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