Calculate GST amount instantly. Add or remove GST from any price with our free online GST calculator.
| Base Price: | ₹0.00 |
| CGST (9%): | ₹0.00 |
| SGST (9%): | ₹0.00 |
| Total Price: | ₹0.00 |
GST (Goods and Services Tax) is a comprehensive indirect tax levied on the supply of goods and services in India. Introduced on July 1, 2017, GST replaced multiple indirect taxes like VAT, Service Tax, Excise Duty, and others, creating a unified tax system across the country. GST is charged at different rates - 0%, 5%, 12%, 18%, and 28% - depending on the product or service category.
GST has two components: CGST (Central GST) collected by the Central Government and SGST (State GST) collected by the State Government. For inter-state transactions, IGST (Integrated GST) is charged. Each component is half of the total GST rate. For example, if GST is 18%, CGST is 9% and SGST is 9%.
Our free GST calculator is simple and easy to use:
The calculator works both ways - add GST to a price or remove GST from a final price to know the base amount.
Adding GST (Exclusive):
GST Amount = (Original Price × GST Rate) ÷ 100
Total Price = Original Price + GST Amount
Example: Add 18% GST to ₹10,000
Removing GST (Inclusive):
Base Price = Total Price ÷ (1 + GST Rate/100)
GST Amount = Total Price - Base Price
Example: Remove 18% GST from ₹11,800
GST is charged at different rates based on product and service categories:
Additionally, a cess may be charged on certain luxury and sin goods above the 28% GST rate.
CGST (Central Goods and Services Tax): Half of the GST amount collected by the Central Government. Applies to intra-state (within same state) transactions.
SGST (State Goods and Services Tax): Half of the GST amount collected by the State Government. Also applies to intra-state transactions.
IGST (Integrated Goods and Services Tax): Full GST amount collected by the Central Government for inter-state (between different states) transactions. Central Government later distributes the state's share.
Example 1 (Intra-State): Buying goods in Delhi from a Delhi seller
Example 2 (Inter-State): Buying goods in Delhi from a Maharashtra seller
GST has simplified India's tax system with several benefits:
Items Exempt from GST (0% GST):
Reverse Charge Mechanism (RCM): In certain cases, the receiver of goods/services pays GST instead of the supplier. Common in:
Composition Scheme: Small businesses with turnover up to ₹1.5 crore can opt for simplified GST at lower rates (1-5%) with quarterly filing instead of monthly.
To add GST: GST Amount = (Price × Rate) ÷ 100; Total = Price + GST Amount. Example: ₹5,000 at 18% GST → GST = ₹900, Total = ₹5,900. To remove GST: Base Price = Total ÷ (1 + Rate/100). Example: ₹5,900 inclusive of 18% → Base = ₹5,000. CGST and SGST are each half the total GST rate.
GST Exclusive means the base price is shown and GST is added on top — common in B2B invoices. GST Inclusive means the final price already contains GST — common in retail MRP. If a price says "plus GST" it is exclusive; if it says "incl. of all taxes" it is inclusive. Always check the invoice to know exactly what you are paying.
CGST goes to the Central Government and SGST goes to the State Government; each is exactly half the total GST rate. For 18% GST: CGST = 9%, SGST = 9%. Both apply to intra-state transactions. For inter-state transactions, IGST (the full rate) replaces CGST + SGST — the total tax amount remains the same.
0% on essentials like fresh milk, vegetables, and bread. 5% on household necessities like sugar, tea, edible oils, and medicines. 12% on computers, mobile phones, and processed foods. 18% (most common) on soaps, IT services, and restaurants. 28% on luxury goods like cars, ACs, and cigarettes. Check the HSN code on your invoice for the exact applicable rate.
If you know both base price and total: GST% = [(Total − Base) ÷ Base] × 100. Example: Base ₹10,000, Total ₹11,800 → GST% = 18%. If you only have the total, try dividing by 1.05, 1.12, 1.18, or 1.28 to estimate the base price. The GST rate and breakup must be clearly stated on every legal invoice.
Yes, GST applies equally to online and offline purchases. E-commerce platforms collect GST on behalf of sellers; most consumer product prices shown online are already GST-inclusive. If you are a business, you can claim Input Tax Credit on GST paid for business purchases. Always download the invoice for warranty and tax records.
GST registration is mandatory if annual turnover exceeds ₹40 lakh (₹20 lakh for special-category states), or if you make inter-state supplies or sell through e-commerce. Voluntary registration is beneficial for claiming Input Tax Credit. Failure to register when required attracts a penalty of ₹10,000 or 10% of tax due, whichever is higher.
ITC allows registered businesses to offset GST paid on purchases (inputs) against GST collected on sales. Example: Pay ₹1,800 GST on raw materials; collect ₹3,600 GST on finished goods — net GST payable = ₹1,800. ITC cannot be claimed on personal-use items, motor vehicles (in most cases), or food and beverages. It is the primary reason businesses register for GST even below the threshold.
Regular taxpayers file GSTR-1 (sales) by the 11th and GSTR-3B (summary + payment) by the 20th of each month. Businesses with turnover below ₹5 crore can opt for quarterly QRMP filing. Log in to the GST portal (gst.gov.in), upload invoices, pay tax online, and submit with DSC or EVC. Late filing attracts ₹50/day (up to ₹5,000) plus 18% annual interest on unpaid tax.
Interest of 18% per annum accrues daily on unpaid GST from the due date. Late fees are ₹100/day (CGST + SGST combined), capped at ₹5,000 per return. Persistent defaults can lead to GST registration cancellation, bank account attachment, or asset seizure. Tax evasion above ₹5 crore may result in criminal prosecution with imprisonment up to 5 years.
