How is GST calculated in India?

For Exclusive GST (Add GST): GST Amount = (Base Amount × GST%) / 100, Total = Base Amount + GST Amount. For Inclusive GST (Remove GST): Base Amount = Total Amount / (1 + GST% / 100), GST Amount = Total Amount - Base Amount.

What is the difference between CGST, SGST, and IGST?

When goods/services are supplied within the same state (Intra-state), GST is split equally between CGST (Central GST) and SGST (State GST). When supplied across state borders (Inter-state), the entire tax is levied as IGST (Integrated GST).

What are the standard GST rate slabs in India?

The primary GST slabs in India are 0% (essential goods), 5% (household essentials), 12% (processed foods/computers), 18% (services, telecom, IT), and 28% (luxury items and automobiles).

Does this calculator store any financial inputs?

No. Toolbox runs 100% in your browser memory. No amounts, business figures, or calculations are logged or sent to any server.

Calculators

GST Calculator

Calculate Goods & Services Tax (GST) in India with support for Add GST, Reverse GST, CGST/SGST/IGST splits, and standard rate slabs.

Quick Answer & Summary

A GST Calculator computes gross amounts, net prices, CGST, SGST, and IGST tax splits across standard 5%, 12%, 18%, and 28% tax slabs with reverse tax calculation client-side.

GST Tax Calculation Formulas

GST Amount = (Base_Price * GST_Rate) / 100 | Pre-GST Base = Total / (1 + GST_Rate / 100)

For intra-state sales, GST is divided equally into CGST (50%) and SGST (50%).

GST Calculator Inputs

Instant & Client-Side

Calculate GST addition, removal (reverse GST), and state tax splits.

Calculation Mode

Base Amount / Net Price (₹)

₹

GST Rate (%)18%

Standard Slabs:

Supply Destination

Tax Breakdown SummaryRate applied: 18%

Total Payable Amount

₹11,800

Total GST Included: ₹1,800

Net Amount (Base Price):

₹10,000

Total GST (18%):

₹1,800

↳ Central GST (CGST 9%):₹900

↳ State GST (SGST 9%):₹900

Gross Total Amount:

₹11,800

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Updated: August 2026

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Documentation & Guide

How to Use GST Calculator

Choose Calculation Mode

Select "Add GST" to calculate gross price from a net base price, or "Remove GST" (Reverse GST) to extract the tax component from an MRP/gross amount.

Enter Amount & Select Rate Slab

Enter the currency amount and click on standard GST slabs (0%, 5%, 12%, 18%, 28%) or type a custom tax percentage.

Review CGST, SGST, & IGST Breakdown

Toggle Intra-state vs Inter-state supply to inspect the exact Central, State, or Integrated GST splits.

Pro Tips

Use "Remove GST" to calculate the pre-tax price when checking an MRP invoice.

Click the quick slab buttons (5%, 12%, 18%, 28%) for one-click rate configuration.

Click the copy icons next to any value to copy formatted amounts directly.

Practical Examples & Conversions

Input

Net Amount: ₹50,000 | Rate: 18% | Mode: Add GST

Output

GST: ₹9,000 (CGST: ₹4,500, SGST: ₹4,500) | Total: ₹59,000

Frequently Asked Questions (PAA)

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Authoritative Standards & Citations

Calculations and algorithms on this page are implemented and verified in strict accordance with the following official technical specifications:

IEEE Standards Association

IEEE 754: Standard for Floating-Point Arithmetic

Industry standard for floating-point computation formats, rounding rules, and arithmetic.

Reserve Bank of India

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