GST Calculator

Add or remove GST instantly. Pick the rate, set intra/inter-state — we'll show the CGST/SGST or IGST breakdown.

Amount (₹)

GST rate

Direction

Add GST

Remove GST (incl.)

Supply

Intra-state

Inter-state

Base amount

Total GST

Total payable

Need this on every invoice automatically? Get Ketpy Book →

How it works

The math behind it.

Add GST: Tax = Amount × Rate% · Total = Amount + Tax
Remove GST (inclusive): Base = Amount × 100 / (100 + Rate) · Tax = Amount − Base
Intra-state (same state on both sides): GST splits 50/50 into CGST + SGST
Inter-state (different states): full amount goes to IGST

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📱

About the Ketpy Book App

A lightweight installable app for tenant access. Works on Android, iOS, Windows, macOS and Linux.

✓Installs in < 5 seconds — no Play Store / App Store needed.
✓Opens straight into your tenant login — like a native app.
✓Home-screen icon, splash screen, full-screen experience.
✓Quick shortcuts: Create invoice · Record payment · GST returns.
✓Zero permissions — no camera, mic, location, contacts, files. Just network access.
✓Encrypted in transit (TLS 1.3) — same security as the website.
✓One-tap uninstall from your home-screen / app drawer.

🔒 Safe by design: a PWA cannot read other apps' data or run code outside your browser sandbox. There are no security violations.

⏱ Heads up: install can take up to 30 seconds. Don't panic — the Ketpy Book icon will appear in your app drawer / home screen within 30 seconds of confirming.

Installing Ketpy Book…

Confirm the prompt on your device.

⏱ This can take up to 30 seconds. The icon will appear in your app drawer / home screen shortly — don't panic.