GST calculator

Add GST to a price or take it out of an inclusive one, with the CGST and SGST split. Works for VAT and any sales tax too.

Amount before tax

GST rate

Amount with taxAnswer

1,000 plus 18% GST is 1,180

Show working

Gross = Net × (1 + Rate ÷ 100)= 1,000 × (1 + 18 ÷ 100)= 1,180

Decimals

How it’s worked out

1To add GST, multiply the amount by (1 + rate ÷ 100). ₹1,000 at 18% is ₹1,180.
2To remove GST from an inclusive price, divide by (1 + rate ÷ 100). Taking 18% off ₹1,180 is wrong; dividing by 1.18 gives the right ₹1,000.
3Within a state the tax is split equally into CGST and SGST; between states it’s charged as IGST. The presets are the slabs in use since September 2025.

Example

1,000 plus 18% GST is 1,180.

Find the sale price, how much you save, or what discount you’re really getting. Any two of price, discount and final price.

2,499 with 40% off is 1,499.40

Price a product for the margin you want, or check the margin and markup on what you already sell.

Selling at 800 from a cost of 600 is a 25% margin

The steady yearly growth rate that turns a starting value into an ending value. Fill in any three of the four boxes.

100,000 growing to 250,000 in 5 years is 20.11% a year

Turn exam marks into a percentage, or work out how many marks you need to reach a target score.

432 out of 500 is 86.4%

Fill in any two of the three boxes and the third works itself out: what is P% of X, X is what percent of Y, or X is P% of what.

15% of 200 is 30

How much did something go up or down, in percent? Enter the old and new values, or a value and a change to find the other.

From 80 to 100 is a 25% increase