GST calculator: add or remove GST from a price
Use this to work out the GST on a price, or to find the price before GST when you only know the bill total.
How to use this calculator
- Enter the amount.
- Choose the GST rate that applies to the item. Rates are set by the GST Council and change, so check the current rate for your goods or service.
- Say whether the amount is without GST (add GST) or with GST (take GST out).
- Read the price before GST, the GST, the total and the CGST and SGST split.
Worked examples
Example 1
A ₹10,000 service quoted without GST at 18%.
You enter
| Amount | ₹10,000 |
|---|---|
| GST rate | 18% |
| The amount is | Without GST (add GST) |
You get
| Price before GST | ₹10,000.00 |
|---|---|
| GST (18%) | ₹1,800.00 |
| Price with GST | ₹11,800.00 |
| Split between CGST and SGST | ₹900.00 each |
Example 2
A ₹11,800 bill that already includes 18% GST.
You enter
| Amount | ₹11,800 |
|---|---|
| GST rate | 18% |
| The amount is | With GST (take GST out) |
You get
| Price before GST | ₹10,000.00 |
|---|---|
| GST (18%) | ₹1,800.00 |
| Price with GST | ₹11,800.00 |
| Split between CGST and SGST | ₹900.00 each |
How it works
For a sale within one state, GST is split equally into CGST and SGST. For a sale between states, the whole amount is IGST instead; the total is the same.
To take GST out of a price that already includes it, divide by 1 plus the rate. Subtracting the rate percentage from the total gives a wrong answer.
Formula
GST = base price x rate. Base price = total / (1 + rate).
Common questions
Why not just subtract 18% from the bill?
Because 18% was added to the base, not to the total. The base is the total divided by 1.18.
Which rate applies to my item?
Check the official GST rate finder or ask your accountant; rates have been revised over time.
Does this file GST returns?
No, it only does the arithmetic.
Learn more
Read the lesson Tax basics and good records on pusaram.com for the ideas behind this calculator.
Calculators give estimates for learning and planning. They are not financial, tax, legal or medical advice, and results depend entirely on the numbers you enter. Check rates, limits and rules with an official source or a qualified professional before acting.