Free GST Calculator
Add or Remove GST instantly
Calculate GST for any amount at 0%, 5%, 12%, 18%, or 28% slab. Add GST to a base price or extract GST from an inclusive price — free, no account needed.
What Is a GST Calculator?
A GST Calculator is a free online tool that instantly computes the Goods and Services Tax on any amount. Whether you're a retailer pricing products, a freelancer raising an invoice, or an accountant reconciling books, this tool calculates the exact GST amount and breaks it down into CGST, SGST, or IGST — saving you time and preventing billing errors.
How to Use the GST Calculator in 3 Steps
Step 1 — Enter the Amount
Type the price of your product or service. This can be the base price (excluding GST) or the selling price (including GST).
Step 2 — Select GST Rate & Mode
Choose the applicable GST rate (0%, 5%, 12%, 18%, or 28%) and select whether you want to Add GST to a base price or Remove GST from an inclusive price.
Step 3 — Read Your Results
Instantly see the base amount, GST amount (CGST + SGST or IGST), and the final total. Copy or use these values in your invoice.
Who Uses This GST Calculator?
Shop Owners & Retailers
Quickly calculate the selling price inclusive of GST before billing a customer.
Freelancers & Consultants
Find out how much GST to charge on your service invoice and what you'll remit to the government.
Accountants & Tax Professionals
Verify GST breakdowns on incoming invoices to ensure compliance.
E-commerce Sellers
Price your products correctly by calculating the GST-inclusive selling price based on your cost + margin.
Frequently Asked Questions
What is GST and what are the current rates in India?
GST (Goods and Services Tax) is India's unified indirect tax. Current slab rates are 0%, 5%, 12%, 18%, and 28%, applied based on the type of goods or services.
How do I add GST to a price?
Enter the base price (excluding GST), select the rate, and choose 'Add GST'. The calculator shows you the GST amount and final price including GST.
How do I remove GST from an inclusive price?
Enter the total price (including GST), select the rate, and choose 'Remove GST'. The calculator extracts the base price and GST component.
What is CGST and SGST?
For intra-state transactions, GST is split equally into CGST (Central GST) and SGST (State GST). For inter-state transactions, IGST (Integrated GST) applies at the full rate.
Is this GST calculator free?
Yes, 100% free. No login, no subscription, no limits. Use it as many times as you need.
Can I use this for GST invoicing?
Absolutely. Use this calculator to find the correct GST values, then enter them into our Free GST Invoice Generator to create a professional invoice.