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GST calculator
Enter an amount and a GST rate. See the price with GST added and the base price with GST removed, side by side.
EXAMPLE ESTIMATE
Your estimate
Enter your values and select Calculate.
Estimates use your assumptions. Calculations use unrounded values; displayed figures are rounded.
HOW IT WORKS
A useful estimate starts with clear inputs.
- Step 1
Enter the amount and the GST rate.
- Step 2
Read the price with GST added, and the base price if your amount already includes GST.
- Step 3
Check the CGST and SGST split used for sales within one state.
At 18% GST, a price of 1,000 becomes 1,180 with GST added. If 1,000 already includes 18% GST, the base price is about 847.46.
Calculation assumptions and limits
GST is a single percentage that you enter. Adding GST multiplies the base price by one plus the rate. Removing GST divides a GST-inclusive price by one plus the rate. The CGST and SGST split is half each, which applies to sales within one state; sales between states use IGST at the full rate. Cess, rounding rules and input tax credit are excluded. Check the current rate for your item on the official GST portal.
Can I use this with my local currency?
Yes. All inputs in one calculation must use the same currency. The currency selector changes number formatting and labels; it does not look up exchange rates or convert your amounts. Local loan rules and products may calculate costs differently.
Are my numbers saved?
No. Your inputs and results stay in this page’s memory. Reloading or leaving clears them. Download the CSV or print the result if you want a copy.
Learn more: GST portal (India). WORDMIO calculates locally using the assumptions above.
Add GST to a price or take it out
Enter an amount and a GST rate. The calculator shows the price with GST added, and, at the same time, the base price you would get if your amount already included GST. You do not need to choose a mode first.
It also splits the GST into CGST and SGST for sales within one state. Use it to check an invoice, price a product or work out how much tax is hidden in a price. It runs on your device and nothing is uploaded.
Free to use. No sign-up required.
How to use this tool
- Enter the amount and the GST rate.
- Read the price with GST added, or the base price if your amount already includes GST.
- Check the CGST and SGST split for sales within one state.
A practical example
At 18% GST, 1,000 becomes 1,180 with GST added. If 1,000 already includes 18% GST, the base price is about 847.46.
Before you finish
Confirm the GST rate for your item on the official GST portal. Rates can change, and cess is not included.
Adding GST and removing GST
To add GST, multiply the base price by one plus the rate: at 18%, a base price of 1,000 becomes 1,180. To remove GST from a price that already includes it, divide by one plus the rate, not subtract the percentage. At 18%, 1,180 divided by 1.18 gives the base price of 1,000. Subtracting 18% of 1,180 would give 967.60, which is wrong.
CGST, SGST and IGST
When a seller and buyer are in the same state, the GST is split equally between the central government (CGST) and the state government (SGST). At 18%, that is 9% each. When the sale crosses a state border, the whole amount is charged as IGST. The total tax on the price is the same either way; only the labels on the invoice change.
Choosing the right rate
GST rates are set by item or service category, and the commonly used slabs are 5%, 12%, 18% and 28%, with some goods at 0% or special rates. Rates can change, so confirm the rate for your item on the official GST portal or ask your accountant before putting it on an invoice.
What this calculator does not do
It does not apply cess, round invoice totals by a specific rule, work out input tax credit or file returns. It is a quick way to check a price, not accounting software. For discounts before tax, try the discount calculator.
Frequently asked questions
How do I add GST to a price?
Multiply the price by one plus the rate. At 18%, multiply by 1.18, so 1,000 becomes 1,180.
How do I remove GST from a GST-inclusive price?
Divide the price by one plus the rate. At 18%, divide by 1.18. Do not subtract 18% of the total, because the percentage applies to the base price, not the total.
What is the CGST and SGST split?
For a sale within one state, the GST is divided equally between the central and state governments. At 18% GST that is 9% CGST and 9% SGST. Sales between states charge the whole amount as IGST.
Which GST rate should I use?
Use the rate for your item or service as published on the official GST portal. Common slabs are 5%, 12%, 18% and 28%, and rates can change.
Can I use it for VAT or sales tax?
Yes, it works as a percentage tax calculator. Enter the VAT or sales tax rate, and ignore the CGST and SGST split.
Does it work for VAT or sales tax?
Yes, as a simple percentage calculator. Enter your VAT or sales tax rate in the rate box. The CGST and SGST split only applies to GST.