GST Calculator (India)
The GST calculator adds goods and services tax to an amount or extracts the GST component from a price that already includes it, for the Indian GST rates of 5%, 12%, 18% and 28%.
Last updated 2026-08-14
Embed on your site
Embed this calculator on your site:
<iframe src="https://calculopedia.darzh.xyz/embed/gst-calculator/" width="100%" height="700" style="border:0;border-radius:12px" loading="lazy"></iframe>
quizExample
How this calculator works, with real numbers (no JavaScript needed):
Inputs
- Amount
- 10000
- GST rate
- 18
- Calculation type
- add
Results
- GST amount
- ₹1,800
- Total (with GST)
- ₹11,800
- Base amount (without GST)
- ₹10,000
functionsThe formula
GST (Goods and Services Tax) is India's single indirect tax on the supply of goods and services. It replaced a tangle of earlier taxes (VAT, service tax, excise, octroi) when it launched in July 2017. GST is charged at four main rates depending on the item: 5%, 12%, 18% and 28% (plus 0% and 3% for a few special goods).
Two ways to use GST
1. Add GST to a price (exclusive price): if you sell at ₹10,000 plus 18% GST, the GST is ₹10,000 × 18% = ₹1,800 and the customer pays ₹11,800.
GST = amount × rate / 100
Total = amount + GST
2. Extract GST from an inclusive price: if the customer pays ₹11,800 and that price already includes 18% GST, the base is ₹11,800 / 1.18 = ₹10,000 and the GST is ₹1,800.
Base = amount / (1 + rate / 100)
GST = amount − base
Which rate applies?
- 5% — most packaged food, medicines, domestic LPG, rail/air economy
- 12% — computers, processed food, business-class air travel
- 18% — most services, telecom, restaurants, packaged consumer goods
- 28% — luxury goods, cars, tobacco, aerated drinks (some also attract a cess)
When in doubt, ask your supplier or check the GST council rate schedule — the rate really depends on the specific HSN/SAC code of your item.
helpFrequently asked questions
question_markHow is GST calculated?
To add GST: GST = amount × rate ÷ 100, then add it to the amount. To extract GST from an inclusive price: base = amount ÷ (1 + rate ÷ 100), and GST = amount − base.
question_markWhat are the GST rates in India?
India has four main GST rates: 5%, 12%, 18% and 28%, plus 0% and 3% for select items. Essential goods are taxed lower; luxury and sin goods are taxed higher.
question_markIs GST included in the price I pay?
Usually yes. Most retail prices are GST-inclusive. If you need the pre-GST price, use the "Extract GST" mode of this calculator.
question_markHow do I claim GST input credit?
Registered businesses can claim a credit for the GST they pay on purchases, offset against the GST they collect on sales. This is what prevents GST from piling up across the supply chain.