How GST Calculator Works & Mathematical Formula
Calculate Goods and Services Tax (GST) or VAT amount (both Inclusive and Exclusive). Our online engine computes high-precision results in real-time right in your browser without transmitting your personal information over external servers.
Standard Mathematical Formula:
$$\text{GST (Exclusive)} = \text{Amount} \times \frac{\text{Rate}}{100}, \quad \text{GST (Inclusive)} = \text{Amount} - \left[\text{Amount} \times \left(\frac{100}{100 + \text{Rate}}\right)\right]$$
Step-by-Step Calculation Example
For an amount of $1,000 with 18% GST: Adding GST (Exclusive) gives $180 GST, total $1,180. If $1,000 already includes 18% GST (Inclusive), the net amount is $847.46 and GST is $152.54.
Frequently Asked Questions
What is GST Inclusive vs GST Exclusive?
GST Inclusive means the tax amount is already included in the final price. GST Exclusive means the tax must be added on top of the original base price.
What are standard GST tax brackets?
Standard GST rates typically include 0%, 5%, 12%, 18%, and 28% depending on the goods or services classification.