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GST Calculator

GST Calculator — Add or Remove GST

Calculate GST (Goods and Services Tax) amount and final price at any GST slab — add GST to a base price, or extract the base price and GST from a GST-inclusive amount.

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🧾 Enter Amount & GST Rate

GST Slabs: 0% | 5% | 12% | 18% | 28%
CGST = SGST = Half of GST rate (intra-state)

📊 GST Breakdown

Enter amount and click Calculate
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Disclaimer: Results provided by this calculator are for educational and estimation purposes only. They do not constitute formal financial, investment, or tax advice. Actual returns, rates, and tax treatment depend on your specific circumstances and prevailing regulations. Consult a certified financial advisor or chartered accountant before making financial decisions.

How GST Calculations Work

India's GST has four main slabs: 5%, 12%, 18%, and 28%, depending on the goods or service category. Adding GST: Final Price = Base Price × (1 + GST%/100). Removing GST from an inclusive price: Base Price = Inclusive Price ÷ (1 + GST%/100) — this second calculation is where most people make mistakes, since you can't just subtract the percentage directly from the inclusive price.

Worked Example

A base price of ₹10,000 at 18% GST (the most common slab, covering most goods and services): GST amount = ₹1,800, final price = ₹11,800. Conversely, if ₹11,800 is already GST-inclusive, the base price is ₹11,800 ÷ 1.18 = ₹10,000, not ₹11,800 − 18% = ₹9,676 as a naive calculation would give.

Frequently Asked Questions

Because the GST percentage is calculated on the base price, not the inclusive price. ₹11,800 inclusive of 18% GST has a base price of ₹10,000 (since 10,000 × 1.18 = 11,800) — but subtracting 18% of 11,800 (₹2,124) from 11,800 incorrectly gives ₹9,676. Always divide by (1 + rate/100) to remove GST correctly.
The HSN (goods) or SAC (services) code assigned to the product or service determines its GST slab — essential items are often 5% or exempt, standard goods/services are commonly 18%, and luxury or sin goods can be 28% (sometimes with additional cess). Check the official GST rate finder or consult a CA for your specific product/service category.
If you're a GST-registered business selling taxable goods or services, yes — invoices must show your GSTIN, HSN/SAC codes, and the GST breakdown. Use our dedicated GST Invoice Generator to create compliant invoices with the correct format.
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