Calculate GST Amount
Enter the base amount (before GST)
Exclusive GST: Total = Amount × (1 + GST%) | GST = Amount × GST%
How the GST Calculator Works
The GST Calculator computes your tax amount and final price in real time using two modes: Exclusive (GST is added on top of your base price) and Inclusive (GST is already embedded within the total price). Simply enter your amount, select the applicable GST slab using the quick-select pills, toggle the mode, and the breakdown - Actual Amount, GST Amount, and Total - appears instantly alongside a visual donut chart.
The formulas used are: Exclusive GST: Total = Base Amount × (1 + GST%) and
GST Amount = Base × GST%. Inclusive GST:
Actual (Pre-tax) = Total ÷ (1 + GST%) and GST Amount = Total − Actual. All five
standard Indian GST slabs - 0%, 5%, 12%, 18%, and 28% - are available as one-click selection pills.
The Formulas — GST Exclusive & Inclusive
Exclusive GST (Add GST on Top)
GST = Base × (GST% ÷ 100) | Total = Base + GST
Inclusive GST (Extract GST from Total)
Base = Total ÷ (1 + GST% ÷ 100) | GST = Total − Base
Both directions use the same factor (1 + GST%/100) — exclusive multiplies the base by it, inclusive divides the total by it.
| Variable | Meaning | Exclusive (₹10,000 + 18% GST) | Inclusive (₹11,800 incl. 18% GST) |
|---|---|---|---|
| Base | Pre-tax Amount | ₹10,000 (entered) | ₹10,000 (computed) |
| GST% | GST Rate | 18% | 18% |
| GST Amount | Base × 0.18 / Total − Base | ₹1,800 (10,000 × 0.18) | ₹1,800 (11,800 − 10,000) |
| Total | Amount Payable (incl. GST) | ₹11,800 (10,000 + 1,800) | ₹11,800 (entered) |
| CGST + SGST | Intra-state Split (at 18%) | ₹900 + ₹900 (9% each) | ₹900 + ₹900 |
Exclusive vs. Inclusive GST - Key Difference
The most common source of GST confusion in billing is whether the stated price includes GST or excludes it. Here's the definitive breakdown:
➕ Exclusive GST (Add GST)
The listed price is the pre-tax base amount. GST is calculated on top of it and added to arrive at the total payable. Used on B2B invoices, wholesale price lists, and vendor quotations where the buyer will claim Input Tax Credit (ITC).
Example: Base ₹10,000 + 18% GST (₹1,800) = Total ₹11,800.
➖ Inclusive GST (Remove GST)
The listed price (MRP) already includes GST. This mode extracts the pre-tax component and the GST portion from the total. Used on consumer product MRPs, restaurant bills, retail price tags, and B2C transactions.
Example: MRP ₹1,180 (inclusive 18%) → Base = ₹1,000 + GST = ₹180.
GST Slabs in India - What Gets Taxed at What Rate?
India's GST system categorises goods and services into five slabs. Selecting the right slab is critical for compliance:
🟢 0% GST - Exempt
Fresh vegetables & fruits, milk, eggs, unprocessed cereals, bread, salt, books, newspapers, educational services, and healthcare. No tax on these essential items.
🔵 5% GST - Essentials
Packaged food items, edible oils, sugar, tea, coffee (not from cafes), medicines, domestic LPG, coal, and economy hotel stays. Low-rate slab for near-essential products.
🟡 12% GST - Standard
Processed food, computers, mobile phones, business class air travel, hotel rooms (₹1,001–₹2,500/night), construction materials, and most packaged goods.
🟠 18% GST - Most Services
Most services including telecom, banking, IT services, restaurants (non-AC), hotel stays (₹2,501–₹7,500/night), consumer appliances, paint, and capital goods. The most widely applicable slab.
🔴 28% GST - Luxury
Automobiles, tobacco products, aerated drinks, luxury hotel stays (above ₹7,500/night), casinos, and high-end consumer goods. Additionally subject to Cess for sin goods.
🏦 CGST + SGST vs IGST
For intra-state sales: GST splits equally into CGST (Central) + SGST (State). For inter-state sales: IGST (Integrated GST) is levied. Example: 18% intra-state = 9% CGST + 9% SGST.
If you need to calculate VAT for international transactions or non-GST jurisdictions, our VAT Calculator handles both inclusive and exclusive VAT modes. For business loan interest on GST-related working capital financing, our Interest Calculator provides both simple and compound interest breakdowns. When dining out or settling a restaurant bill, our Tip Calculator helps you calculate the right service tip and split it equally across the group.
Understanding Your GST Calculation Results
The results panel shows three key figures. Here's exactly what each one means:
Actual Amount (Pre-Tax) - In Exclusive mode, this is the base price you entered. In Inclusive mode, this is the computed pre-GST price extracted from the MRP. This is the value on which GST is applied and is used for Input Tax Credit (ITC) claims.
GST Amount - The tax component only. Shown alongside
the selected rate badge (e.g., "18%"). In Exclusive mode: GST = Base × Rate%. In Inclusive
mode: GST = Total − (Total ÷ (1 + Rate%)). This figure is what you remit to the government.
Total Amount - The final amount payable by the buyer
/ charged on the invoice. In Exclusive mode: Total = Base + GST. In Inclusive mode: this
equals the MRP you entered. The donut chart visually shows the proportion of base amount vs. GST.
Donut Chart - The blue segment represents the actual (pre-tax) amount as a proportion of the total. The gradient segment represents the GST portion. A thinner GST arc means a smaller tax burden relative to the base price.
Frequently Asked Questions
What are the GST slabs in India?
What is the difference between CGST, SGST, and IGST?
Can I use this calculator to check invoice amounts before billing a client?
How do I calculate GST for a composite supply or mixed supply?
Is GST applicable on exports from India?
What is Reverse Charge Mechanism (RCM) under GST?
Financial Disclaimer
Mutual fund investments are subject to market risks. Please read all scheme related documents carefully before investing. Past performance of the schemes is neither an indicator nor a guarantee of future performance.
The purpose of this calculator is to inform the user and provide estimates. Do not plan your finances based solely on the calculator results.