GST Calculator
A GST (Goods and Services Tax) calculator helps you quickly add or remove GST from any amount. GST is a comprehensive indirect tax levied on the manufacture, sale, and consumption of goods and services in India. It replaced many earlier taxes like VAT, service tax, and excise duty, creating a single unified tax system. This calculator works in two modes. In Add GST mode, you enter the base price of a product or service and the GST rate, and it shows the GST amount and the total price including tax. In Remove GST mode, you enter a price that already includes GST and the GST rate, and it breaks down the base price and the GST amount separately. India uses several GST rate slabs: 0% (essential items like fresh food), 5% (common necessities), 12% (processed food and standard goods), 18% (most goods and services, the most common rate), and 28% (luxury items and sin goods). Whether you are a business owner calculating tax on your invoices, a shopper checking a bill, or a professional verifying GST amounts, this calculator gives you instant, accurate results.
Formula
Add GST (base price to total): GST = Base x (Rate / 100) Total = Base + GST Remove GST (total to base price): Base = Total / (1 + Rate / 100) GST = Total - Base
Example
Example 1 - Add GST: Base price = Rs 10,000 GST rate = 18% GST = 10,000 x (18/100) = Rs 1,800 Total = 10,000 + 1,800 = Rs 11,800 Example 2 - Remove GST: Total (incl. GST) = Rs 11,800 GST rate = 18% Base = 11,800 / (1 + 18/100) = 11,800 / 1.18 = Rs 10,000 GST = 11,800 - 10,000 = Rs 1,800 Result: Adding 18% GST to Rs 10,000 gives Rs 11,800. Removing 18% GST from Rs 11,800 gives back Rs 10,000.
How to Use
- Choose whether you want to add GST or remove GST from an amount.
- Enter the amount (base price for Add mode, total price for Remove mode).
- Enter the GST rate (common rates: 5%, 12%, 18%, 28%).
- Click Calculate to see the GST amount and the base/total price.
- Use the results for invoicing, billing, or verifying tax calculations.
Frequently Asked Questions
What is GST?
GST (Goods and Services Tax) is a comprehensive indirect tax levied on the supply of goods and services in India. It was introduced on July 1, 2017, and replaced multiple earlier taxes like VAT, service tax, central excise, and octroi, creating a single unified tax system across the country.
What are the different GST rate slabs in India?
India has five main GST rate slabs: 0% (essential items like fresh food and books), 5% (common necessities), 12% (processed food and standard goods), 18% (most goods and services, the most common rate), and 28% (luxury items, automobiles, tobacco, and aerated drinks). Some items like gold and diamonds have special rates of 3% and 0.25%.
What is the difference between CGST, SGST, and IGST?
For transactions within a state, GST is split equally into CGST (Central GST, collected by the central government) and SGST (State GST, collected by the state government). For transactions across states, IGST (Integrated GST) is collected by the central government and later shared with the destination state. The total GST rate is the same regardless of the type.
How do I calculate GST on a bill?
To add GST to a base price, multiply the base price by the GST rate divided by 100, then add the result to the base price. For example, on a base price of Rs 10,000 at 18% GST, the tax is Rs 1,800 and the total is Rs 11,800. To remove GST from a total, divide the total by (1 + rate/100) to get the base.
What is input tax credit (ITC)?
Input Tax Credit allows businesses to claim credit for the GST they paid on purchases (input) and use it to offset the GST they collect on sales (output). This ensures that GST is only paid on the value added at each stage, not on the total price, which prevents tax-on-tax cascading.
Is GST the same in all states of India?
Yes, GST rates are uniform across all states and union territories in India. The GST Council, which includes representatives from the central and state governments, decides the rates. This was a major reform that created a common national market by eliminating state-level tax variations.