GST calculator

Q: Can I make a GST bill with this?

For one bill, use the GST bill maker (https://accounts.marothiatechs.com/gst-invoice-maker/): fill it in, then print it or save it as PDF. For bills every day, install Wisdom Accounts and say the party, item and rate.

Add GST to a price, or take it out of a price that already has it. You see the CGST, SGST or IGST, and the total.

Free, no login needed CGST, SGST and IGST shown Works with a rate you type, too

What do you want to do?

Add GSTto a price without GST Remove GSTfrom a price with GST

Price without GST

GST rate

Other rates %

Where is the buyer?

Same stateCGST + SGST Another stateIGST

Answer

Type an amount to see the GST.

In the app, this sum is done in every bill.Say the party, item and rate. Wisdom Accounts makes the GST bill, with CGST, SGST or IGST worked out.

Get it onGoogle Play iPhone · App Store“Wisdom OMS”

How to add GST to a price

Multiply the price by the GST rate and divide by 100. That is the GST. Add it to the price.

GST = price × rate ÷ 100
price with GST = price + GST

For ₹1,000 at 18%: the GST is ₹180, and the price with GST is ₹1,180.

How to take GST out of a price

When the price already has GST in it, multiply it by 100 and divide by 100 plus the rate. That is the price without GST. The rest is the GST.

price without GST = price with GST × 100 ÷ (100 + rate)
GST = price with GST − price without GST

For ₹1,180 at 18%: the price without GST is ₹1,000, and the GST is ₹180.

CGST and SGST, or IGST?

When the buyer is in your own state, the GST is split in two halves: CGST and SGST. At 18%, that is 9% CGST and 9% SGST.

When the buyer is in another state, the whole GST is IGST. The total is the same both ways.

Which GST rate?

Since 22 September 2025 there are two main GST rates, 5% and 18%, and a 40% rate on a few goods. A bill made before that date may show 12% or 28%.

The rate of an item goes by its HSN code (SAC code for a service). Look at a purchase bill for the same item, or ask your CA. For a rate that is not on the buttons, type it in the box.

Rates read from the GST Council’s announcements on 10 November 2026.

Questions

Questions about working out GST

How do I add GST to a price?

Choose Add GST, type the price and tap the rate. The GST is the price multiplied by the rate, divided by 100. For ₹1,000 at 18%, the GST is ₹180 and the price with GST is ₹1,180.

How do I take GST out of a price?

Choose Remove GST and type the price that has GST in it. The price without GST is that price multiplied by 100, divided by 100 plus the rate. For ₹1,180 at 18%, it is ₹1,000 and the GST is ₹180.

When is it CGST and SGST, and when is it IGST?

A sale to a buyer in your own state has CGST and SGST, half the GST each. A sale to a buyer in another state has IGST for the whole GST.

Which GST rate applies to my item?

The rate goes by the item’s HSN code, or SAC code for a service. Look at a purchase bill for the same item, or ask your CA.

Why is CGST one paisa more than SGST on some amounts?

When the GST is an odd number of paise, it cannot be cut into two equal halves. The extra paisa goes to CGST, so the two always add up to the GST.

Can I make a GST bill with this?

For one bill, use the GST bill maker: fill it in, then print it or save it as PDF. For bills every day, install Wisdom Accounts and say the party, item and rate.

GST calculator

Answer

How to add GST to a price

How to take GST out of a price

CGST and SGST, or IGST?

Which GST rate?

Questions about working out GST

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