GST Calculator

Add or remove GST from any amount

Amount (₹) Enter the base amount or GST-inclusive amount

GST Rate (%)

Calculation Type

Transaction Type

Total GST Amount

₹0.00

CGST

₹0.00

SGST

₹0.00

Base Amount

₹0.00

Total (Incl. GST)

₹0.00

💡 Business Impact

Accurate GST calculations improve compliance, reduce filing errors, and help avoid penalties during audits. Cross-checking GST on every invoice ensures your GSTR-3B filing matches your actual transactions.

Recommended Actions

✓ Cross-check GST on invoices before filing GSTR-3B

✓ Verify CGST/SGST split for intra-state transactions

✓ Use correct HSN codes to avoid ITC mismatch

✓ Review GST applicability when product mix changes

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Formula & How It Works

GST is calculated differently depending on whether your price already includes GST or not.

Adding GST to a Base Price (Exclusive)

GST Amount = Base Price × GST Rate ÷ 100
Total Price = Base Price + GST Amount

Removing GST from an Inclusive Price

Base Price = Inclusive Price ÷ (1 + GST Rate ÷ 100)
GST Amount = Inclusive Price − Base Price

Intra-State vs Inter-State

For intra-state sales: GST splits equally into CGST and SGST (each at half the rate). For inter-state sales: the full GST amount is levied as IGST.

Worked Example

Scenario: You sell a product for ₹10,000 (excluding GST) at 18% GST within your state.

GST Amount = ₹10,000 × 18 ÷ 100 = ₹1,800

CGST = ₹1,800 ÷ 2 = ₹900

SGST = ₹1,800 ÷ 2 = ₹900

Invoice Total = ₹10,000 + ₹1,800 = ₹11,800

If the customer gives you ₹11,800 and asks "how much is the base price?", switch to "Remove GST" mode and enter ₹11,800 at 18%.

When to Use This Calculator

Retail billing — verify the correct GST amount before issuing an invoice
Traders — check if a vendor's invoice has the right GST applied
Distributors — calculate GST on scheme-adjusted pricing
CAs — quickly cross-check taxable value in client invoices
E-commerce sellers — determine the correct tax-exclusive listing price
Business owners — estimate GST outflow before filing GSTR-3B

Frequently Asked Questions

What is GST? +

GST (Goods and Services Tax) is a single indirect tax levied on the supply of goods and services in India. It replaced multiple taxes like VAT, service tax, and excise duty.

Which GST slab applies to my product? +

GST slabs in India are 0%, 5%, 12%, 18%, and 28%. The applicable rate depends on the HSN code of your product. Use the HSN Code Finder tool to identify your product's GST rate.

How do I calculate GST on a price? +

To calculate GST on a price (exclusive): GST Amount = Price × GST Rate / 100. To get the price inclusive of GST: Price with GST = Price + GST Amount.

How do I remove GST from an inclusive price? +

If you have a GST-inclusive price and want to find the base price: Base Price = Inclusive Price / (1 + GST Rate / 100). GST Amount = Inclusive Price - Base Price.

Is this GST calculator accurate for Indian businesses? +

Yes. This calculator uses the standard GST formulas applicable under the Indian GST Act and supports all official slabs — 5%, 12%, 18%, and 28%.

Can I use this to check CGST and SGST separately? +

Yes. For intra-state transactions, CGST = SGST = GST Amount / 2. For inter-state, the full amount is IGST. This tool shows the split.