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Mastering the GST Calculator: Formulas, Slabs, and Worked Examples Goods and Services Tax (GST) is a unified destination-based consumption tax applied to the supply of goods and services. Calculating GST correctly is essential to avoid undercharging clients, miscalculating profit margins, or filing erroneous tax returns. A GST calculator automates two essential financial workflows: GST Exclusive (Adding GST): Calculating the total bill amount when quoting a net taxable base. GST Inclusive (Extracting GST): Reverse-calculating the pre-tax base price and tax component embedded inside a retail MRP or final gross price. 1. Core Mathematical Formulas Mode A: GST Exclusive (Tax Added On Top) Used primarily in business-to-business (B2B) quotations where service fees or product prices are quoted exclusive of taxes. $$\text{GST Amount} = \frac{\text{Taxable Value} \times \text{GST Rate}}{100}$$ $$\text{Total Invoice Amount} = \text{Taxable Value} + \text{GST Amount}$$ Mode B: GST...