How do you calculate GST?

To add GST: Gross = Net × (1 + GST%/100). To remove GST: Net = Gross / (1 + GST%/100). For example, ₹1,000 + 18% GST = ₹1,180. ₹1,180 with 18% GST removed = ₹1,000.

What are the GST slabs in India?

India has 5 main GST slabs: 0% (essential food), 5% (basic necessities), 12% (processed food, mobile phones), 18% (most goods and services), and 28% (luxury, tobacco, automobiles). Some items have a Compensation Cess on top of 28%.

What is the difference between CGST, SGST and IGST?

Intra-state: GST splits equally into CGST (Central) and SGST (State). Inter-state: the full GST is IGST. The total rate is the same; only the distribution differs.

When does GST registration become mandatory?

Mandatory if annual turnover exceeds ₹40 Lakh for goods (₹20 Lakh for services). E-commerce sellers and inter-state suppliers must register regardless.

What is reverse charge in GST?

Under reverse charge mechanism (RCM), the recipient of goods/services pays GST instead of the supplier. Common cases: import of services, purchases from unregistered dealers (specified categories), goods transport agency services.

Can I claim input tax credit (ITC)?

Yes, registered businesses can claim ITC on GST paid on inputs/services used for business. Match invoices in GSTR-2A/2B and file GSTR-3B. ITC is not available for personal expenses, motor vehicles (with exceptions), and certain blocked credits.

Does this calculator save my data?

No. All calculations happen entirely inside your browser.

GST Calculator

Add GST. Remove GST. See the CGST/SGST/IGST split. That's it.

Enter GST Details

Amount (Net, before GST)

₹

One Thousand Rupees Only

GST Rate

Indian GST has 5 main slabs. 0%: essential food. 5%: basic necessities. 12%: processed food, mobile phones. 18%: most goods/services. 28%: luxury, tobacco, automobiles.

Transaction Type

Final Amount (with GST)

₹0

at 18% GST

For intra-state, CGST and SGST each contribute half of the total GST. For inter-state, the full amount is IGST.

0% Net

Net Amount ₹0

GST ₹0

Gross Amount ₹0

CGST + SGST + IGST Breakdown

For intra-state transactions, total GST splits equally into CGST and SGST. For inter-state, the entire amount is IGST.

CGST

Central GST

₹0

Half of total GST (intra-state only). Goes to Central Government. Rate = total GST / 2.

SGST

State GST

₹0

Half of total GST (intra-state only). Goes to State Government where consumed. Rate = total GST / 2.

IGST

Integrated GST

₹0

Full GST on inter-state transactions. Shared between Centre and the destination State.

Everyday Examples

5% · Intra-state

Restaurant bill

₹2,000 + 5% GST = ₹2,100. GST = ₹100, split ₹50 CGST + ₹50 SGST.

18% · Inter-state

Freelance invoice

₹50,000 + 18% GST = ₹59,000. Client in another state → ₹9,000 IGST.

18% · Reverse

Inclusive bill

₹1,180 inclusive at 18% GST → base ₹1,000 + ₹180 tax.

Common Items per GST Slab

Tap any slab to apply it to your calculation. Indian GST has 5 main rates.

Input Tax Credit (ITC)

If you are GST-registered, you can claim Input Tax Credit on the GST you pay on business inputs. The net GST you remit to the Government = output GST − input GST. Hidden tip text: 0

The Formulas

Add GST: Gross = Net × (1 + GST% / 100)

Remove GST: Net = Gross / (1 + GST% / 100)

Intra-state: GST splits 50/50 into CGST + SGST. Inter-state: full GST is IGST. Total rate is the same — only the distribution differs.

FAQs

What's the difference between CGST, SGST and IGST?

Intra-state (same state): GST splits equally into CGST (Centre) and SGST (State). Inter-state (different states): the full GST is IGST. Total rate is identical — only the split differs.

Which GST rate applies?

0% for essentials (milk, fruit, books). 5% for packaged food and transport. 12% for processed food and mobile phones. 18% for most goods and services including restaurants and telecom. 28% for luxury — cars, ACs, tobacco.

What's the reverse GST formula?

Net = Gross / (1 + GST%/100). Example: ₹1,180 at 18% GST → ₹1,180 / 1.18 = ₹1,000 base + ₹180 tax.

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GST Calculator

GST calculator and results

Enter GST Details

Hidden chart section

CGST + SGST + IGST Breakdown

Central GST

State GST

Integrated GST

Hidden scenarios section

Everyday Examples

Restaurant bill

Freelance invoice

Inclusive bill

Common Items per GST Slab

Hidden schedule section

Input Tax Credit (ITC)

The Formulas

FAQs

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