GST Calculator

Goods and Services Tax (GST) is a comprehensive, multi-stage, destination-based indirect tax levied on the manufacture, sale, and consumption of goods and services throughout India, replacing multiple earlier taxes like VAT, Service Tax, and Excise Duty.

To add GST, multiply the taxable base amount by the GST rate percentage and divide by 100: GST Amount = Base Amount × (GST Rate ÷ 100). The total price equals Base Amount + GST Amount.

Select 'Add GST' mode, enter your base cost (e.g. ₹10,000), choose the applicable GST rate (e.g. 18%), and calculate. The GST of ₹1,800 is added to give a final amount of ₹11,800.

Select 'Remove GST' mode. To find the pre-tax base price from a GST-inclusive figure, divide the total by (1 + GST Rate ÷ 100). For example, ₹11,800 ÷ 1.18 = ₹10,000 base price, meaning GST is ₹1,800.

Use the reverse formula: GST Amount = Inclusive Total − [Inclusive Total ÷ (1 + GST Rate ÷ 100)]. Alternatively: GST Amount = (Inclusive Total × GST Rate) ÷ (100 + GST Rate).

Central Goods and Services Tax (CGST) is the tax component collected by the Central Government of India on intra-state transactions (sales within the same state). It represents exactly half of the total GST rate.

State Goods and Services Tax (SGST) is the tax component collected by the respective State Government on intra-state transactions. It is equal in rate and amount to CGST.

Integrated Goods and Services Tax (IGST) is levied on all inter-state transactions (sales between different states or union territories) as well as imports and exports. The Central Government collects IGST and apportions it between Center and destination State.

Both apply simultaneously to sales within the same state. CGST revenue accrues to the central Union government, while SGST revenue goes to the state government where the goods or services are consumed.

For sales within the same state, tax is split equally into CGST and SGST (e.g., 9% CGST + 9% SGST = 18%). For sales between different states, a single combined IGST rate is levied (e.g., 18% IGST). They are mutually exclusive on any single transaction.

Multiply the base amount by 0.05. For ₹1,000: ₹1,000 × 5 ÷ 100 = ₹50 GST, making the total ₹1,050. In intra-state sales, this splits into 2.5% CGST (₹25) and 2.5% SGST (₹25).

Multiply the base amount by 0.12. For ₹1,000: ₹1,000 × 12 ÷ 100 = ₹120 GST, making the total ₹1,120 (6% CGST + 6% SGST).

Multiply the base amount by 0.18. For ₹1,000: ₹1,000 × 18 ÷ 100 = ₹180 GST, making the total ₹1,180 (9% CGST + 9% SGST).

Multiply the base amount by 0.28. For ₹1,000: ₹1,000 × 28 ÷ 100 = ₹280 GST, making the total ₹1,280 (14% CGST + 14% SGST).

At 5% GST: ₹50 (Total ₹1,050). At 12% GST: ₹120 (Total ₹1,120). At 18% GST: ₹180 (Total ₹1,180). At 28% GST: ₹280 (Total ₹1,280).

At 18% standard GST: ₹10,000 × 18% = ₹1,800 GST, giving a final total of ₹11,800. In intra-state sales, CGST is ₹900 and SGST is ₹900.

At 18% GST: ₹1,00,000 × 18% = ₹18,000 GST, giving a final total of ₹1,18,000. In intra-state sales, CGST is ₹9,000 and SGST is ₹9,000.

Standard commercial trade practice applies discounts to the base price first, and then calculates GST on the discounted net amount. For example: ₹10,000 minus 10% discount = ₹9,000. 18% GST on ₹9,000 = ₹1,620. Total = ₹10,620.

In almost all B2B and retail commercial transactions under GST rules, GST is chargeable only on the transaction value actually payable after trade discounts recorded on the invoice.

Divide the GST-inclusive price by (1 + GST Rate / 100). For an item sold at ₹2,360 inclusive of 18% GST: ₹2,360 ÷ 1.18 = ₹2,000 original price.

A GST-inclusive price is the final retail price paid by the customer that already contains the tax amount. Most consumer MRP (Maximum Retail Price) figures in India are GST-inclusive.

A GST-exclusive price is the net base cost before applicable taxes are added. In B2B wholesale quotations, prices are usually quoted exclusive of GST.

Because the total price represents 118% of the original base (100% base + 18% tax). Dividing by 1.18 mathematically scales the 118% back down to 100%.

Yes. In addition to standard chips (0%, 5%, 12%, 18%, 28%), you can enter any custom rate, including special rates like 0.25%, 1.5%, 3% (gold/jewellery), or 7.5%.

Yes. You can enter fractional paisa amounts like ₹1,250.75 and decimal rates like 7.5%. Calculations run with full floating-point precision.

Yes. By default, monetary amounts are formatted with the Indian comma system (e.g. ₹1,00,000 for one lakh and ₹1,00,00,000 for one crore) with the ₹ Indian Rupee symbol.

No. All calculations occur 100% locally in your web browser. No financial data, amounts, or tax calculations are ever sent to our servers.

Yes. It operates with zero external server dependencies, ensuring complete privacy for your business, invoicing, and personal finances.

Yes. Once the web page is loaded, all formulas, currency formatters, breakdowns, and tools run completely offline without an internet connection.