Free Online GST Calculator

Calculate Goods and Services Tax (GST) easily for your rental, service, or product invoices. Supports both GST Exclusive and GST Inclusive modes.

GST Input Details
GST Exclusive (+)
GST Inclusive (-)
₹
3%
5%
12%
18% (Standard/Rent)
28%
Custom %
Calculation Summary
Net Base Amount: ₹10,000.00
GST Rate Applied: 18%
Total GST Tax Amount: ₹1,800.00

Tax Breakdown

CGST (9%): ₹900.00
SGST (9%): ₹900.00
IGST (Inter-State 100%) ₹1,800.00

How GST Calculation Works

1. GST Exclusive Formula (Adding GST to base amount):

GST Amount = (Base Amount × GST%) / 100

Total Gross Amount = Base Amount + GST Amount

2. GST Inclusive Formula (Extracting GST from gross amount):

Base Amount = Gross Amount / (1 + (GST% / 100))

GST Amount = Gross Amount - Base Amount