Exclusive pricing
Add GST on top of your price.
- Rate from the item
- Line-wise tax
- Correct total
Free tool · no sign-up
GST calculator: add GST or take it out in one step
Enter an amount, choose the GST rate and say whether GST is already included. The calculator shows the taxable value, the CGST and SGST (or IGST) and the total. Below it, you’ll find the formulas and the current GST rates in plain words.
- Free to use
- No sign-up
- Current GST rates
Two common calculations
Both at 18% GST
Examples
| Case | You have | Result |
|---|---|---|
| Add GSTPrice before tax: ₹10,000 | ₹10,000.00 | GST ₹1,800 · total ₹11,800 |
| Remove GSTPrice with tax: ₹11,800 | ₹11,800.00 | Value ₹10,000 · GST ₹1,800 |
| Same stateSplit equallyCGST 9% + SGST 9% | ₹1,800 | ₹900 + ₹900 |
| Other stateOne tax | ₹1,800 | IGST ₹1,800 |
Add GSTValue × rate ÷ 100
Remove GSTPrice × rate ÷ (100 + rate)
Works forAny rate
Free tool
CGST / SGST / IGST
Same maths on bills
Try it
How to calculate GST
To add GST to a price: multiply the price by the rate and divide by 100. For ₹10,000 at 18%, GST is 10,000 × 18 ÷ 100 = ₹1,800, and the total is ₹11,800.
To take GST out of a price that already includes it: multiply the price by the rate and divide by (100 + rate). For ₹11,800 at 18%, GST is 11,800 × 18 ÷ 118 = ₹1,800, and the value before tax is ₹10,000. A common mistake is to take 18% of ₹11,800, which gives ₹2,124 and is wrong.
To split the tax: if you and your customer are in the same state, half the GST is CGST and half is SGST (₹900 + ₹900 in the example). If the sale goes to another state, the full amount is IGST.
Milaan ERP does exactly this on every line of every bill, so your staff never have to work it out by hand.
Common mistakes
GST maths mistakes we see all the time
Small calculation errors that cause big headaches later.
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Taking 18% of an inclusive price
GST on ₹11,800 is worked out as ₹2,124 instead of ₹1,800.
Use rate ÷ (100 + rate)
For an inclusive price, divide by 118 (at 18%), not by 100.
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Charging 18% CGST and 18% SGST
The full rate is charged twice on a local sale.
Split the rate in half
For an 18% item: 9% CGST and 9% SGST.
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Using old rates
Bills still use 12% or 28% for items that moved in September 2025.
Update rates on items
Check your item rates against the current notification and update them once.
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Rounding on the total only
Line-wise tax and the bill total don’t agree by a few paise.
Consistent rounding
Choose line-wise or bill-wise rounding and use it on every bill.
Features
GST calculations Milaan ERP does on every bill
The calculator above is free. In the software, all of this happens automatically.
Inclusive pricing
Take GST out of MRP or inclusive rates.
- Taxable value worked out
- Common in retail
- No manual maths
CGST, SGST or IGST
Split chosen from the place of supply.
- Same state: half and half
- Other state: IGST
- SEZ and exports
Discounts before tax
Tax on the right value.
- Item and bill discounts
- Tax after discount
- Price-based slabs where needed
Rounding
Totals that agree to the paisa.
- Line or bill rounding
- Round-off shown
- Same rule every time
Rate changes
Update once when rates change.
- Change on the item
- New bills use new rate
- Old bills unchanged
Step by step
Using the calculator above
Four quick steps to get your answer.
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Enter the amount Step 1
Type the price you have, in rupees.
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Choose the rate Step 2
Pick the GST rate for the item. Most goods and services are at 5% or 18% since September 2025.
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Before or including GST? Step 3
Choose “Before GST” to add tax, or “Including GST” to take it out of the price.
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Read the result Step 4
See the taxable value, the tax split for a sale within your state or to another state, and the total.
Current GST rates
GST rates since 22 September 2025
After the 56th GST Council meeting, most goods and services moved to two main rates: 5% for everyday and essential items and 18% as the standard rate. The old 12% and 28% slabs were folded into these for most items. A special 40% rate applies to a short list of luxury and harmful goods, such as pan masala, cigarettes, aerated sugary drinks and large cars.
A few special rates remain, such as 3% on gold and silver and 0.25% on rough precious stones, and many basic items are nil-rated or exempt. Always check the rate for your item’s HSN code.
Tip: GST rules change from time to time. This page explains them in simple words; for advice on your own case, please speak to your CA.
- 5%Everyday and essential goods and services.
- 18%The standard rate for most goods and services.
- 40%Luxury and harmful goods on a short list.
- 3% and 0.25%Gold, silver and some precious stones.
- Nil or exemptMany basic food items and services.
Pricing
Two simple ways to get started
GST billing and return reports are in every plan; e-invoicing, e-way bills and some advanced features are in the higher plans. Choose cloud to work from anywhere, or offline to keep everything on your own computer.
Offline desktop
from ₹8,999 one-time
Installed on your computer. Works without internet.
- Four plans, single PC to unlimited LAN users
- Data stays on your PC
- Optional yearly support & updates
Online cloud
from ₹12,999 per year
Use it on any computer or phone. Updates and backups included.
- Three plans, from 2 to 10 users
- Mobile app and daily cloud backup
- 14-day free trial
Prices are before 18% GST. Barcode billing, batch tracking, e-invoicing and multi-location features are in the higher plans. Need several users or GSTINs? Ask us for a quote. Compare all plans.
FAQ
Questions about calculating GST, answered.
Can’t find your question here? Message us and a real person will reply.
Need GST worked out on every bill?
Milaan ERP does these calculations automatically. Ask us for a quick demo.
How do I calculate GST on a price?
Multiply the price by the GST rate and divide by 100. For ₹10,000 at 18%, GST is ₹1,800 and the total is ₹11,800.
How do I remove GST from a price that includes it?
Multiply the price by the rate and divide by (100 + rate). For ₹11,800 at 18%: 11,800 × 18 ÷ 118 = ₹1,800 GST, so the value before tax is ₹10,000.
How is GST split into CGST and SGST?
For a sale within your state, the GST is split equally. At 18%, that is 9% CGST and 9% SGST. For a sale to another state, the full 18% is IGST.
What are the GST rates now?
Since 22 September 2025, most items are at 5% or 18%, with a 40% rate for a short list of luxury and harmful goods. Gold and silver are at 3%, and many basic items are nil-rated or exempt.
Are the 12% and 28% slabs gone?
For most goods and services, yes. Items earlier at 12% mostly moved to 5% or 18%, and most items at 28% moved to 18%, with some going to 40%.
Is this calculator free?
Yes. Use it as often as you like. No sign-up is needed.
How much does Milaan ERP cost?
The offline desktop plan starts at ₹8,999 as a one-time payment and online cloud plans start at ₹12,999 per year, both before 18% GST. Features such as barcode billing, batch tracking, e-invoicing and multi-location are in the higher plans, so tell us what you need and we’ll suggest the right one. The cloud plans come with a free 14-day trial.
Does Milaan ERP calculate GST automatically?
Yes. Every bill uses the rate on each item and splits it into CGST and SGST or IGST from the place of supply.
GST features
More GST help
Let every bill do the maths for you
Try Milaan ERP for 14 days. GST is worked out correctly on every line of every bill.