Calculate GST, CGST, SGST, IGST and Sales Tax instantly. Supports 5%, 12%, 18%, 28% GST slabs and custom tax percentages.
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Amount before tax
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Total GST on net
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Half of GST
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Half of GST
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Full GST
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Amount after tax
Enter an amount to see Net Price, GST Amount, CGST, SGST, IGST, Final Price and the formulas used.
Indian GST is charged on taxable supplies. Supplies inside one state split that tax into CGST and SGST. Supplies across states use IGST. Sales tax outside that system is a single percentage of the amount.
Goods and Services Tax on a taxable amount. The slab depends on the goods or service.
The intra-state split. Central GST and State GST are each a share of the same GST rate.
Integrated GST for a supply from one state to another, in place of CGST and SGST.
A global percentage applied to the amount when the tax is not an Indian GST slab.
Answers on GST, CGST, SGST, IGST, sales tax, custom rates, inclusive and exclusive amounts, and when to use ZemERP.
GST (Goods and Services Tax) is a percentage tax on the value of goods or services. In India it is charged as CGST and SGST within a state, or as IGST between states. This calculator applies the rate you choose to the amount you enter.
Enter the net amount, choose Add GST, pick a tax percentage (5%, 12%, 18%, 28% or custom) and set Country to India. GST Amount, CGST, SGST, IGST and Final Price update as you type.
Enter the amount that already includes tax, choose Remove GST, then select the tax percentage. The tool works backwards to Net Price and GST Amount so you can see the exclusive value.
CGST is Central GST, the Union government’s share of intra-state GST. When India is selected, this calculator splits GST equally, so an 18% slab is 9% CGST and 9% SGST.
SGST is State GST, the state government’s share of intra-state GST. It is charged together with CGST on supplies within the same state. Here it is always half of the GST amount.
IGST is Integrated GST, used for supplies from one Indian state to another. It equals the full GST rate instead of a CGST plus SGST split. The results card shows IGST as the full GST Amount for inter-state use.
GST in India is split into CGST, SGST or IGST by place of supply. Sales tax is a single percentage on the amount, used in Global mode. Choose India for the GST split, or Global for one sales-tax figure.
Yes. Open Tax percentage, choose Custom, and enter any rate from 0 to 100, including decimals such as 9.5%. The same Add GST and Remove GST modes apply to a custom rate.
Yes. The GST calculator is free to use with no sign-up, no ZemERP login and no limit on calculations.
Yes. Businesses can check GST on quotes, invoices and purchase amounts, including Indian slabs and a custom rate. For live GST billing across invoices and books, use ZemERP.
Yes. Freelancers can add or remove GST on a fee before sending a quote or invoice. Results stay in this browser; nothing is saved to a ZemERP account.
Amounts are rounded to two decimal places. Add GST uses amount × rate / 100. Remove GST uses amount ÷ (1 + rate / 100). Indian GST is split equally into CGST and SGST. It does not replace a tax advisor or your GST return.
Yes. Inclusive GST means the amount already contains tax. Choose Remove GST, enter that amount and the rate. Net Price is the exclusive value and GST Amount is the tax inside the total.
Yes. Exclusive GST means the amount is before tax. Choose Add GST, enter the net amount and the rate. Final Price is the inclusive total.
This page calculates GST on one amount. ZemERP is cloud ERP for schools, colleges and businesses — GST-oriented billing, inventory, payroll, CRM and records in one organisation login, so you are not re-typing the same figures in a spreadsheet.
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