GST Calculator

Add or remove GST from a price. Supports standard GST slabs (5%, 12%, 18%, 28%) and custom rates.

Base Amount (Excl. GST)

₹

GST Rate (%)

Key Takeaways & Quick Facts

Primary Purpose

Calculate GST amount and total price including or excluding GST.

Execution Environment

100% Client-Side In-Browser (Zero Cloud Uploads)

Standard Verification

Calculations tested against standard benchmarks

How to Use GST Calculator

Select whether you want to "Add GST" or "Remove GST".
Enter the base amount (if adding) or the inclusive total amount (if removing).
Select a standard GST rate (5%, 12%, 18%, 28%) or enter a custom rate.
The calculator instantly breaks down the GST amount, CGST/SGST/IGST, and the total or base price.

How it Works

To Add GST, the calculator multiplies the base amount by the GST rate. To Remove GST, it extracts the base amount from the total inclusive price using the formula: Base = Total / (1 + Rate/100). It then breaks down the tax into CGST and SGST (half each, for intra-state sales) or IGST (full amount, for inter-state sales).

Add GST: GST Amount = Base × (Rate ÷ 100) Total = Base + GST Amount Remove GST: Base = Total ÷ (1 + (Rate ÷ 100)) GST Amount = Total − Base

Examples

Input: Add 18% GST to ₹1,000

Result: Total: ₹1,180 (GST: ₹180)

Input: Remove 18% GST from ₹1,180

Result: Base: ₹1,000 (GST: ₹180)

Frequently Asked Questions

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

CGST (Central GST) and SGST (State GST) are levied on transactions happening within the same state (intra-state). IGST (Integrated GST) is levied on transactions happening between different states (inter-state).

How do I calculate the base price before GST?

If you know the total inclusive price, divide it by (1 + GST Rate). For example, to find the base price of ₹1180 inclusive of 18% GST, divide 1180 by 1.18, which equals 1000.

Does this calculator apply to my specific transaction?

This calculator provides mathematical GST breakdowns. The actual tax treatment, applicable rates, and whether CGST/SGST or IGST applies depends entirely on your specific transaction type, location, and local tax laws.

Formula Audited & Client-Side Private

Calculations are verified against standard mathematical and banking benchmarks. Data stays on your device in local memory.

Our Verification Standards →