GST Calculator
Calculate GST-inclusive or GST-exclusive price. Supports all Indian GST rates — 5%, 12%, 18%, and 28%. Shows CGST and SGST breakup.
Enter values and click Calculate GST to see results
Formula
GST Formulas
GST-Exclusive (add tax):
GST Amount = Base Price × GST Rate / 100
Total Price = Base Price + GST Amount
GST-Inclusive (extract tax):
Base Price = Total Price / (1 + GST Rate / 100)
GST Amount = Total Price − Base Price
Common GST Rates: 5%, 12%, 18%, 28%
How to Use the GST Calculator
Enter the amount, select the GST rate (5%, 12%, 18%, or 28%), and choose whether you want to add GST to a base price or extract GST from a total price. Click Calculate for an instant breakup including CGST and SGST components.
What is GST?
GST (Goods and Services Tax) is a comprehensive indirect tax levied on the supply of goods and services in India. Introduced on 1 July 2017, it replaced multiple cascading taxes like VAT, service tax, and excise duty. GST is split equally into CGST (Central GST) and SGST (State GST) for intra-state transactions, or charged as IGST for inter-state transactions.
GST Calculation Formulas
GST Rate Slab Guide
- 5% GST: Essential items — packaged food, footwear under ₹1,000, transport
- 12% GST: Processed food, business class air tickets, smartphones
- 18% GST: Most goods and services — electronics, IT services, restaurants (non-AC)
- 28% GST: Luxury items — cars, AC restaurants, cement, tobacco
Why Businesses Need This
Small businesses, freelancers, and professionals registered under GST need to calculate tax components for every invoice. This tool gives you the exact CGST/SGST split needed for GST invoicing. For inter-state transactions, the total GST amount shown is your IGST amount.
Frequently Asked Questions
What are the GST slab rates in India?
India has four GST slabs: 5% (essential goods), 12% (standard goods), 18% (most services and goods), and 28% (luxury and sin goods). Some items are GST-exempt (0%).
Is this calculator free, and do I need to sign up?
Yes, it is completely free with no sign-up. There are no usage limits and no paywalls.
Are my inputs saved or sent to any server?
No. Every calculation happens entirely in your browser. Nothing you type is uploaded, logged, or shared with us or any third party.