Please enter a valid amount
Total Amount
₹0
₹0Base Amount
₹0GST Amount
₹0CGST
₹0SGST
⚠️ CGST and SGST shown assume an intra-state transaction (each is half the total GST rate). For inter-state transactions, the full amount is charged as IGST instead.
How GST Is Calculated
Understanding GST, CGST and SGST
1
Choose Mode
Add GST to a base price, or remove GST from a final price
2
Select Rate
Pick the applicable GST slab — 5%, 12%, 18% or 28%
3
Get Breakdown
See total GST, plus the CGST and SGST split instantly
Frequently Asked Questions
Common questions about GST calculation
How is GST calculated? ▼
GST is calculated as a percentage of the base price: GST Amount = Base Amount × GST Rate ÷ 100. The total payable amount is the base amount plus the GST amount.
What is the difference between CGST and SGST? ▼
For transactions within the same state, GST is split equally between CGST (Central GST) and SGST (State GST). For example, an 18% GST rate becomes 9% CGST + 9% SGST.
What is IGST? ▼
IGST (Integrated GST) applies to inter-state transactions — sales between different states. The full GST rate is charged as IGST instead of being split into CGST and SGST.
How do I remove GST from a final price? ▼
Use the "Remove GST" mode and enter the final price including GST. The calculator extracts the base price using the formula: Base = Final Amount ÷ (1 + GST Rate/100).
What are the current GST slabs in India? ▼
India's main GST slabs are 5%, 12%, 18%, and 28%, with some goods attracting 0% or special rates. The applicable rate depends on the category of goods or services.
Free GST Calculator with CGST & SGST Breakdown
FileMagic Pro's GST Calculator lets you quickly compute GST amounts for any transaction in India. Whether you need to add GST to a base price or extract the base price from a GST-inclusive amount, this tool gives you an instant, accurate breakdown including CGST and SGST splits.
Why Use an Online GST Calculator?
Manually calculating GST, especially when working backward from an inclusive price, can lead to errors. This free calculator handles both directions instantly, helping shop owners, freelancers, and businesses verify invoices and pricing accurately.