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KagazKit
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Online GST Calculator India

Instantly calculate GST for your business invoices. Add or remove GST (5%, 12%, 18%, 28%).

Enter an amount to see the calculation.

What is the GST Calculator?

The KagazKit GST (Goods and Services Tax) Calculator instantly computes GST on any amount for all standard Indian tax slabs — 5%, 12%, 18%, and 28%. It supports both forward calculation (adding GST to a base price) and reverse calculation (extracting the base price from a GST-inclusive amount). The tool also breaks down the total tax into CGST and SGST components for intra-state transactions, making it invaluable for invoice generation, bill verification, and daily business accounting.

How to Use This Tool

  1. 1
    Enter the amount — Type the base price (exclusive of GST) or the final price (inclusive of GST) depending on your calculation mode.
  2. 2
    Select calculation mode — Choose "Add GST" to calculate tax on a base price, or "Remove GST" to extract the original price from a tax-inclusive amount.
  3. 3
    Select GST rate — Pick the applicable tax slab — 5%, 12%, 18%, or 28% — based on the goods or services category.
  4. 4
    View the breakdown — See the base amount, CGST, SGST (or IGST), and total amount instantly calculated with precise decimal accuracy.

Why Use This Tool?

  • ✓Supports all 4 standard GST slabs: 5%, 12%, 18%, 28%
  • ✓Forward (add) and reverse (remove) GST calculation
  • ✓Automatic CGST/SGST split for intra-state billing
  • ✓Real-time calculation as you type
  • ✓Precise to 2 decimal places for accounting accuracy
  • ✓No data sent to servers — completely private

Common Use Cases

  • Business owners generating invoices who need to calculate the correct GST amount and CGST/SGST split for billing customers.
  • Consumers verifying whether the GST charged on a restaurant bill or retail purchase is correct for the applicable slab.
  • Accountants performing reverse GST calculations to extract pre-tax amounts from inclusive invoices for bookkeeping.
  • E-commerce sellers calculating the correct selling price after adding 18% GST to their base product cost.

Frequently Asked Questions

What is the difference between Adding and Removing GST?

Adding GST means calculating the tax amount on top of a base price (Exclusive of tax) — the result is the final billing amount. Removing GST means calculating backwards from a final total price to find what the original base price was before the tax was applied (Inclusive of tax) — useful for verifying invoices and extracting pre-tax costs.

How is CGST and SGST calculated?

For intra-state sales (within the same state), the total GST amount is divided equally into two halves: Central GST (CGST) and State GST (SGST). For example, an 18% GST becomes 9% CGST and 9% SGST. For inter-state sales, the full amount is charged as IGST (Integrated GST).

What are the standard GST slabs in India?

The primary GST slabs currently active in India are: 5% (essential goods like packaged food, economy hotel rooms), 12% (processed food, business class flights), 18% (most services, electronics, financial services), and 28% (luxury items, automobiles, aerated beverages). Some items have 0% GST (basic necessities like fresh food and healthcare).

Can I use this for IGST calculations?

For inter-state transactions, the total GST amount shown is your IGST amount (since IGST = CGST + SGST at the same total rate). Simply use the total GST figure as your IGST value.

Is my business pricing data secure?

Absolutely. All GST calculations run 100% in your browser. No amounts, rates, or results are ever sent to our servers. Your confidential pricing and billing data remains completely private.