English: Calculates GST tax amounts (CGST, SGST, IGST) or back-calculates the original base price before tax from a gross bill total. Real-Life Example: If you bought an item for ₹1,180 (incl. 18% GST), this tool reveals the base price was ₹1,000 and ₹180 was GST tax.
हिंदी: सामान पर लगने वाला GST टैक्स निकालें, या अगर बिल की कुल रकम पता है तो टैक्स से पहले की असली कीमत (Base Price) पता करें। व्यावहारिक उदाहरण: आपने ₹1,180 का सामान बेचा जिसमें 18% GST शामिल है; यह टूल तुरंत बताएगा कि सामान की असली कीमत ₹1,000 थी और ₹180 GST था।
%
Base Value (Net)
₹
Total Amount (Gross)
₹
CGST (Central) 9%
₹
SGST (State) 9%
₹
IGST (Integrated / Interstate) 18%
₹
Tax Breakdown VisualizerNet: 84.7% | Tax: 15.3%
Base Net Value (84.75%)
CGST (7.625%)
SGST (7.625%)
📖 Tool Guide & Related Resources
What is an AI GST Calculator?
An AI GST Calculator computes Goods and Services Tax (GST) for any invoice amount — both tax-inclusive (extracting GST from final total) and tax-exclusive (adding GST to base price). Designed by CA Piyush Gupta Sir, this free online tool instantly breaks down CGST, SGST, and IGST for all official Indian tax rates (5%, 12%, 18%, 28%, and custom rates) — 100% offline, private, and fast.
GST Rate Slabs in India (2026)
GST Rate
CGST + SGST
Common Items
0%
0% + 0%
Fresh milk, vegetables, grains, books
5%
2.5% + 2.5%
Sugar, tea, spices, coal, footwear under ₹1000
12%
6% + 6%
Butter, ghee, mobile phones, sewing machines
18%
9% + 9%
Most services, IT products, financial services, restaurants (AC)
28%
14% + 14%
Luxury cars, tobacco, aerated drinks, cement
Note: For inter-state supply, IGST applies at the combined rate instead of CGST+SGST. Rates are as per the latest GST Council notifications.
To calculate GST exclusive (adding tax to base amount): GST Amount = Base Amount × (GST Rate / 100). The Total Amount is Base Amount + GST Amount. For intra-state sales, GST is split equally into CGST and SGST. For inter-state sales, full IGST is applied.
What is reverse GST calculation (GST Inclusive)?
Reverse GST calculation extracts the net base price and tax portion from a total invoice amount. The formula is: Base Amount = Total Amount ÷ (1 + GST Rate / 100), and GST Amount = Total Amount - Base Amount.
What is the difference between CGST, SGST, and IGST?
CGST (Central GST) and SGST (State GST) are levied on intra-state transactions (sales within the same state) and shared equally (50-50). IGST (Integrated GST) is levied on inter-state transactions (sales between two different states) and collected by the Central Government.
Are custom GST rates supported by this calculator?
Yes, besides standard slab rates (0%, 0.25%, 3%, 5%, 12%, 18%, 28%), you can input any custom percentage rate to calculate special cess or composite rates accurately.