Goods & Services Tax (GST) Calculator

Easily calculate GST-inclusive and GST-exclusive prices along with CGST, SGST, and IGST breakdowns.

Calculation Type

GST Exclusive: GST is added on top of the original base amount.

Amount (₹)

₹

Select Tax Rate Slab 18% Standard

Or Custom GST Rate:

Supply Type / Location

Intra-State Supply

Splits into CGST + SGST

Inter-State Supply

Single IGST Tax

GST Breakdown Exclusive Mode

Total Payable Amount

₹11,800.00

Net / Pre-Tax Amount ₹10,000.00

Total GST (18%) ₹1,800.00

Central GST (CGST - 9%) ₹900.00

State GST (SGST - 9%) ₹900.00

Base Amount (84.7%) Tax (15.3%)

Multi-Item Tax Bill Estimator

Create an itemized draft estimate with individual tax slabs, auto-calculating totals, and printable invoice preview.

Customer / Company Name

Estimate Date

Default Tax Type

Item Description	Unit Price (₹)	Qty	GST Rate (%)	Tax Amount (₹)	Total Amount (₹)	Action

Subtotal (Pre-Tax): ₹0.00

Total CGST: ₹0.00

Total SGST: ₹0.00

Grand Total: ₹0.00

Understanding GST Calculation Formulas

1. GST Exclusive (Add GST)

Calculates total amount when price excludes tax.

GST Amount = (Base Price × GST Rate) / 100

Total Amount = Base Price + GST Amount

2. GST Inclusive (Remove GST)

Extracts base price and tax portion from a total price.

GST Amount = Total Price - [Total Price × {100 / (100 + GST Rate)}]

Base Price = Total Price - GST Amount

Frequently Asked Questions

What is the difference between CGST, SGST, and IGST?

For supplies within the same state (Intra-State), tax is divided equally into Central GST (CGST) and State GST (SGST). For supplies between different states (Inter-State), Integrated GST (IGST) is charged as a single unified tax.

How do I calculate reverse GST from a final invoice amount?

Select the "Remove GST (Inclusive)" mode on our calculator, enter your final invoice total, and select the applicable rate slab. The calculator instantly extracts the original pre-tax value and tax portion.

Tax Calculation Disclaimer

This GST calculator is provided for estimation and educational purposes. Always consult a certified chartered accountant or tax professional for statutory filing and official invoice auditing.

Privacy Notice

All calculations occur completely client-side in your local browser memory. No financial records, invoice numbers, or personal values are recorded or transmitted to any server.