GST Calculator
Quickly calculate Goods and Services Tax on any purchase.
Pre-GST Price
$0.00
GST Amount
$0.00
Total Price
$0.00
Why Use This Tool? ✅
Fast & Flexible
Instantly calculate results for both adding and removing GST with a simple switch.
Customizable Rates
Use the quick-select buttons for common GST slabs or enter any custom rate you need.
For Business & Shopping
Perfect for creating invoices, checking receipts, or budgeting for purchases.
Accurate Every Time
Avoid manual math errors and get precise calculations for any price or GST rate.
Understanding Goods and Services Tax (GST) 💰
Goods and Services Tax (GST) is an indirect tax used in many countries, including India, Canada, Australia, and Singapore. It is a value-added tax levied on most goods and services sold for domestic consumption. The tax is included in the final price and paid by consumers at the point of sale, with the seller then passing it on to the government.
How to Add GST
This is the standard calculation when you know the base price of an item and need to find the total cost after applying GST.
Formula for GST Amount: GST = Pre-GST Price × (GST Rate / 100)
Formula for Total Price: Total = Pre-GST Price + GST Amount
Example: For a ₹1000 item with an 18% GST rate:
GST = ₹1000 × (18 / 100) = ₹180.00
Total = ₹1000 + ₹180.00 = ₹1180.00
How to Remove GST (Reverse Calculation)
This is useful when you have a final price that already includes GST, and you need to find the original, tax-free price. This is common for accounting purposes or to claim tax credits.
Formula for Pre-GST Price: Pre-GST Price = Total Price / (1 + (GST Rate / 100))
Formula for GST Amount: GST = Total Price - Pre-GST Price
Example: If the total price is ₹1180.00 with an 18% GST rate included:
Pre-GST Price = ₹1180 / (1 + (18 / 100)) = ₹1180 / 1.18 = ₹1000.00
GST = ₹1180 - ₹1000 = ₹180.00
This calculator simplifies these formulas, helping businesses stay compliant and consumers stay informed.