Calculate GST inclusive & exclusive amounts with accurate CGST, SGST & IGST breakdown. Supports all GST rates, reverse calculation, and professional currency formatting — all in seconds.
Enter amount, select GST type & rate — results update instantly
🎯 Select GST Rate
%
GST Calculation Results
All amounts are in Indian Rupees (₹)
Total Amount (Including GST)
₹0.00
Original Amount
₹0.00
GST Amount
₹0.00
Final Amount
₹0.00
📋 Tax Component Breakdown
Original AmountGST Amount
📊 Compare Across All GST Rates
GST Rate
Original
GST Amount
Total Amount
How It Works
Calculate GST in 3 Simple Steps
1
Enter Amount
Type the amount you want to calculate GST for. It can be with or without GST included.
2
Select GST Type & Rate
Choose inclusive or exclusive GST, select supply type, and pick the applicable GST rate (3%, 5%, 12%, 18%, 28%, or custom).
3
Get Instant Breakdown
View the detailed GST breakdown with CGST, SGST, IGST components, visual bar, and rate comparison — all instantly.
Features
Built for Precision & Speed
Enterprise-grade GST calculation with professional features designed for Indian businesses, CAs, and finance professionals.
🔀
Inclusive & Exclusive GST
Calculate GST when it's already included in the price (inclusive) or when it needs to be added on top (exclusive). Both modes with precise formulas.
📊
CGST / SGST / IGST Split
Automatic tax component breakdown for both intra-state (CGST + SGST) and inter-state (IGST) transactions with accurate percentage splits.
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All GST Rates + Custom
Support for all standard Indian GST slabs — 3%, 5%, 12%, 18%, 28% — plus custom rate input for special cases like 0.25% or 1.5%.
🔄
Reverse GST Calculator
Switch to inclusive mode to reverse-calculate the original amount from a GST-inclusive price. Perfect for extracting pre-tax values from MRP.
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Rate Comparison Table
Instantly compare GST amounts across all five standard rates side by side. See how different rates impact your total at a glance.
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100% Private & Accurate
All calculations run in your browser. No data sent to servers. Professional-grade decimal handling eliminates floating-point errors.
FAQ
Frequently Asked Questions
For GST inclusive calculation, the entered amount already includes GST. The tool divides the amount by (1 + GST rate/100) to find the original amount, then calculates the GST component. For example, if the inclusive amount is ₹1,180 at 18% GST, the original amount is ₹1,000 and GST is ₹180.
For GST exclusive calculation, the entered amount does not include GST. The tool multiplies the amount by the GST rate/100 to find the GST component, then adds it to get the total. For example, if the exclusive amount is ₹1,000 at 18% GST, the GST is ₹180 and total is ₹1,180.
CGST (Central GST) and SGST (State GST) apply to intra-state (within the same state) transactions, with GST split equally between center and state. IGST (Integrated GST) applies to inter-state (between different states) transactions, where the full GST goes to the center. For example, at 18% GST: Intra-state = 9% CGST + 9% SGST; Inter-state = 18% IGST.
India has five main GST slabs: 5% (essential items), 12% (processed food, fabrics), 18% (most goods and services), and 28% (luxury items, sin goods). A special 3% rate applies to gold and precious stones. Additionally, 0.25% applies to rough precious stones and 0.1% to uncut diamonds.
For intra-state transactions, the total GST is split equally between CGST and SGST. Each component is exactly half of the total GST amount. For example, if total GST is ₹180 at 18% rate, then CGST = ₹90 (9%) and SGST = ₹90 (9%).
Yes. All calculations are performed entirely in your browser using JavaScript. No personal data or financial information is sent to any server. This tool is 100% client-side and privacy-first.
Reverse GST calculation means finding the original pre-tax amount from a GST-inclusive price. The formula is: Original Amount = Inclusive Amount ÷ (1 + GST Rate/100). This is useful when you know the final price and need to determine the base price and tax component separately.
Yes. The calculator uses professional-grade calculation logic that avoids floating-point errors by working with integer arithmetic internally. All monetary values are rounded to 2 decimal places (paisa level) using proper banker's rounding, ensuring 100% accurate results.