PDF PremFree GST Calculator (India)
Confused by GST-inclusive bills? PDF Prem's free GST calculator adds or removes GST from any amount and splits it into CGST/SGST — covering all Indian tax slabs.
How to use the GST Calculator
- Choose Add GST if your amount excludes GST, or Remove GST if the amount already includes it.
- Enter the amount in rupees.
- Pick the GST slab from the dropdown, or choose Custom for another rate.
- Results update instantly: net amount, GST, CGST/SGST split and gross amount.
- CGST and SGST are each half of the total GST for intra-state sales.
Frequently asked questions
What are CGST and SGST?
For sales within one state, GST is split equally: CGST goes to the Central Government and SGST to the State Government. For inter-state sales, the same total is collected as IGST instead.
Which GST slab applies to my item?
Slabs depend on the product or service — common rates are 5%, 12%, 18% and 28%. Check the CBIC rate schedule or your invoice to confirm.
What is the difference between GST-inclusive and exclusive?
Exclusive means GST is added on top of the base price. Inclusive means the price you see already contains GST, so this calculator works backwards to find the base price.
Is this GST calculator free?
Yes — completely free, no sign-up. All calculations happen in your browser; nothing is sent anywhere.