Free GST Calculator Online — 100% Free, No Hidden Costs

Use GST Calculator for free online. No cost, no limits, no sign-up. Process files instantly in your browser. 100% free forever.

Enter the amount before GST to calculate the total including GST.

Looking for a completely free gst calculator? FlexyPdf's GST Calculator is 100% free with no hidden costs, no premium tiers, and no usage limits. Unlike other tools that restrict features behind paywalls or limit the number of free operations per day, our GST Calculator gives you full access to every feature without spending a penny. There is no trial period — the tool is free today and will remain free. All processing happens locally in your browser, which means we have no server costs to pass on to you. Whether you need to use GST Calculator once or a hundred times a day, it costs nothing.

How to Use GST Calculator

1

Enter Amount

Type the price amount — either the base price or the GST-inclusive price.

2

Select GST Rate

Choose from preset rates (3%, 5%, 12%, 18%, 28%) or enter a custom rate.

3

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

Yes, FlexyPdf's GST Calculator is completely free. No credit card, no sign-up, no premium plan. Every feature is available at no cost.
None. There are no daily limits, no file size caps, no watermarks, and no feature restrictions. Use it as much as you need.
All processing happens in your browser, so there are minimal server costs. We keep the tool free and support it through optional ads.
Yes. The core GST Calculator tool will always be free. We believe essential tools should be accessible to everyone.
No. Our GST Calculator includes all features — no watermarks, no reduced quality, no feature gates. You get the same functionality as expensive software.