FREE Online Reverse GST Calculator /// Advanced Reverse GST Calculator

Advanced GST Calculator

Dark Mode

Reverse GST Calculator

Total Amount (including GST)

GST Rate (%) 5% 12% 18% 28% Custom

Custom GST Rate (%)

Results

Original Amount:

GST Amount:

GST Rate:

Forward GST Calculator

Base Amount (before GST)

GST Rate (%) 5% 12% 18% 28% Custom

Custom GST Rate (%)

Results

GST Amount:

Total Amount:

GST Rate:

GST Information ▼

Goods and Services Tax (GST) is a value-added tax levied on most goods and services sold for domestic consumption.

Key features:

• Multi-stage (charged at each step of production)
• Destination-based (tax goes to consuming state)
• Input tax credit available

GST has replaced many indirect taxes like VAT, service tax, excise duty, etc.

GST Rates by Category ▼

Category	Rate
Essential goods	0% or 5%
Standard goods	12% or 18%
Luxury items	28%
Services	5% to 18%
Special category (sin goods)	28% + cess

 

Here's a clear explanation of the differences between a GST Calculator and a Reverse GST Calculator:

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1. GST Calculator (Standard/Forward Calculation)

Purpose:

Calculates the total price after adding GST to the base amount.

Formula:

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

When to Use:

• When you know the original price before tax and want to find out how much GST will be added and the final price.

• Example: Calculating the total invoice amount for a product priced at ₹1,000 with 18% GST.

Input → Output:

Base Price (₹1,000) + GST Rate (18%) → GST Amount (₹180) + Total Price (₹1,180)

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2. Reverse GST Calculator

Purpose:

Extracts the original price before GST and the GST amount from a total price that already includes tax.

Formula:

Original Price = Total Price / (1 + (GST Rate / 100))  
GST Amount = Total Price - Original Price  

When to Use:

• When you see a price that already includes GST (e.g., a restaurant bill or an invoice) and want to break it down.

• Example: A bill shows ₹1,180 (including 18% GST). You want to know the pre-tax price and the GST portion.

Input → Output:

Total Price (₹1,180) + GST Rate (18%) → Original Price (₹1,000) + GST Amount (₹180)

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Key Differences Table

Feature	GST Calculator (Forward)	Reverse GST Calculator
Input	Base Price + GST Rate	Total Price (including GST) + GST Rate
Output	GST Amount + Total Price	Original Price + GST Amount
Use Case	Creating invoices, pricing goods	Analyzing receipts, expense tracking
Formula	Total = Base + (Base × GST%)	Base = Total / (1 + GST%)

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Example Scenario

• Forward Calculation:
  Product cost: ₹1,000 | GST: 18% → Total = ₹1,180

• Reverse Calculation:
  Receipt total: ₹1,180 | GST: 18% → Original = ₹1,000, GST = ₹180

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Why Both Are Useful

• Businesses use the standard calculator to add GST to prices.

• Consumers/Accountants use the reverse calculator to verify GST charges or claim input tax credits.

Both tools are essential for accurate financial management under GST regimes.