GST Calculator

Quickly calculate tax, split CGST/SGST or IGST, and get totals for both Inclusive and Exclusive pricing.

Calculate GST

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GST Calculator — How it works and how to use it

This easy GST calculator helps you compute tax and totals for goods and services in India. It supports both exclusive and inclusive pricing, CGST/SGST split for intra-state supply, and IGST for inter-state supply.

Key features

  • Calculate tax & total for a single unit or many units
  • Supports common GST rates (5%, 12%, 18%, 28%) and custom rates
  • Inclusive & Exclusive tax modes (reverse calculation)
  • CGST/SGST split for intra-state & IGST for inter-state
  • Responsive, mobile-friendly UI with instant AJAX results

How to use

Enter the amount (price per unit). Choose the GST rate or enter a custom GST rate. Select whether the price you entered already includes GST (Inclusive) or not (Exclusive). Select quantity. For intra-state supply the tool splits tax equally between CGST and SGST; for inter-state it applies IGST.

GST calculation explained

Exclusive mode

Tax = Base Price × (GST %). Grand Total = Base + Tax.

Inclusive mode

Base Price = Amount ÷ (1 + GST %). Tax = Amount − Base Price. Grand Total = Amount.

Common use cases

Invoice generation

Quickly calculate tax lines and totals for items.

Reverse-calculation

If a price tag says ₹118 and you want to know the base and tax at 18%.

Price comparisons

Compare inclusive vs exclusive pricing across suppliers.