GST Calculator
Select mode and enter values below for instant results
What is a GST Calculator?
A GST Calculator is a financial utility designed to compute the Goods and Services Tax payable on a product or service. It serves two vital functions: calculating the total cost by adding tax to a net price (GST Exclusive) and determining the original base price by removing tax from a final invoice (GST Inclusive).
At Nexli Calculator, our tool simplifies tax compliance for business owners, accountants, and consumers. Whether you are creating an invoice with standard tax slabs (5%, 12%, 18%, 28%) or checking if a vendor charged you correctly, this tool provides instant accuracy.
Why Use Our GST Calculator?
Reverse GST Calculation
Easily find the original base price of a product when you only know the final “MRP” (Maximum Retail Price).
Standard Tax Slabs
Pre-set percentage buttons (like 5%, 12%, 18%) make it faster to calculate without typing custom rates manually.
Error-Free Invoicing
Prevent accounting errors by ensuring the CGST (Central) and SGST (State) tax splits are calculated correctly.
Completely Free
Nexli Calculator offers this business utility 100% free with no registration required.
GST Formulas & Logic
Understanding how to add or remove GST uses simple percentage math. Here are the core formulas:
Adding GST (Exclusive)
When price excludes tax.
- GST Amount = (Original Price × GST%) / 100
- Net Price = Original Price + GST Amount
- Example: $100 + 18% = $118
Removing GST (Inclusive)
Finding base price from total.
- Original Price = Total Price × [100 / (100 + GST%)]
- GST Amount = Total Price – Original Price
- Example: $118 with 18% GST included = $100 Base.
How to Use Our GST Calculator
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1
Select Mode
Choose “Add GST” if your price is pre-tax, or “Remove GST” if your price is the final MRP.
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2
Enter Amount
Input the cost of the goods or services.
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3
Select Tax Slab
Click a standard rate (e.g., 5%, 12%, 18%, 28%) or enter a custom rate. Click Calculate to see the breakdown.