GST Calculator

What is GST? – Goods and Services Tax (GST) is a value‑added tax levied on most goods and services sold for domestic consumption. In India, it is divided into two components: CGST (Central GST) and SGST (State GST), each typically half of the total GST rate for intra‑state transactions. For inter‑state supplies, IGST (Integrated GST) is applied (not shown separately in this calculator).

🔢 The core formulas

If the base price (excluding GST) is P and the GST rate is r%:

• GST amount = P × (r / 100)
• Total inclusive amount = P × (1 + r/100)

If the total inclusive amount is T and you need the base price:

• Base price = T / (1 + r/100)
• GST amount = T – base price

For example, if you have a base price of ₹1,000 and GST is 18%, the GST is ₹180, and the total is ₹1,180. Conversely, if you see a price of ₹1,180 including 18% GST, the base price is ₹1,180 / 1.18 = ₹1,000.

📊 CGST & SGST split

For intra‑state sales, the total GST is divided equally into CGST and SGST. So at 18% GST, CGST = SGST = 9% each. Our calculator automatically shows this split. For inter‑state sales, IGST applies as a single tax (not split).

💡 Common GST rates in India

• 5% – essential items (e.g., packaged food, medicines)
• 12% – processed food, computers, etc.
• 18% – most services, capital goods, consumer durables
• 28% – luxury goods, sin products (cars, tobacco, etc.)

You can select these preset rates using the buttons above.

🌍 Multi‑currency support

Choose your preferred currency from the top dropdown. All amounts are displayed with the selected symbol; no exchange rate conversion is applied. This is useful for businesses dealing with international clients or for simple price comparisons.

🔄 Real‑time updates

Every input (amount, GST rate, calculation type) triggers an immediate update – no need to press the Calculate button, though it remains for clarity.