GST Calculator Online — No Watermark on Output
Many free online tools add watermarks to your output — a logo, a URL, or "made with…" branding that ruins professional documents. FlexyPdf's GST Calculator never adds watermarks to your files. Every output is clean, unmarked, and ready for professional use. Whether you are preparing documents for clients, creating content for your business, or working on school assignments, your results look exactly as you intended — without any third-party branding. This is not a limited trial feature; watermark-free output is always included at no cost.
How to Use GST Calculator
Enter Amount
Type the price amount — either the base price or the GST-inclusive price.
Select GST Rate
Choose from preset rates (3%, 5%, 12%, 18%, 28%) or enter a custom rate.
View Results
See the base price, GST amount, CGST/SGST split, IGST, and total amount.
Features
Add or Remove GST
Calculate GST to add on a base price, or extract GST from an inclusive price.
Indian GST Rates
Preset buttons for standard Indian GST rates: 3%, 5%, 12%, 18%, and 28%.
CGST/SGST/IGST Split
See the Central GST, State GST, and Integrated GST breakdowns.
Custom Rates
Enter any custom GST rate for countries or situations with non-standard rates.
Benefits of Using GST Calculator
Completely Free
Use GST Calculator without any cost, limits, or hidden fees. No premium plans needed.
No Installation
Works directly in your browser. No software downloads or plugins required.
100% Private
Your files and data are processed locally. Nothing is uploaded to external servers.
Works Everywhere
Compatible with Chrome, Firefox, Safari, Edge on desktop, tablet, and mobile.
No Sign-Up
Start using the tool immediately. No account creation or email verification.
Always Available
Access this tool 24/7 from anywhere in the world, on any device.
Frequently Asked Questions
Complete Your Calculators Workflow
These free tools work seamlessly with GST Calculator to handle every step of your workflow.