TheGSTCalculator.inGST tools for India
Complete Toolkit

Free GST Tools & Compliance Software

Calculate GST, find HSN/SAC, validate GSTIN, reconcile GSTR-2B, track due dates, and estimate late fee/interest — all in one hub.

Built for CAs, SMBs and online sellers. Covers GSTIN checks, HSN codes, reconciliation, and interest/late fee.

Last reviewed: 7 May 2026Update policy
GST CalculatorReverse GSTInvoice GeneratorDue Date FinderGSTIN Validator2B ReconcilerHSN/SAC

Start here

If you’re not sure which tool to use, these 4 cover the most common GST workflows.

Standard
GST Calculator
Inclusive/exclusive tax calculations with rounding.
Open →
Reverse
Reverse GST
Calculate base price and tax from a total MRP amount.
Open →
Invoice
Invoice Generator
Create professional GST invoices & quotations fast.
Open →
Dates
Due Date Finder
Find GSTR-1 & 3B due dates for any month/year.
Open →
HSN
HSN Search
Find HSN codes, chapters and rate clues for invoices.
Open →
Reconcile
2B Reconciler
Match 2B vs purchase register and find mismatches.
Open →

Browse all tools

Search by tool name, filter by category, and switch grid/list view.

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Safety Note: Use these tools for estimates and cross-checks. Verify final filing values on GST Portal/official sources before filing.
Not legal advice • Verify before filing on gst.gov.in

Update policy

Last reviewed on 7 May 2026. This hub is evergreen (not a news feed). We update calculators and guidance when official rules/notifications change — and we prefer correctness over rushing updates.

What triggers updates

CBIC notifications, GST portal changes, return form updates, and common mismatch reports from users.

Freshness model

Pages revalidate daily (86400s). “Last reviewed” is a stable editorial date (not auto-generated) to avoid UI drift.

Report an issue

Found a mismatch? Share the tool URL + expected value. We’ll verify against official sources.

Contact →
Read: Accuracy Policy • Not legal advice

Mastering GST Compliance: A Step-by-Step Guide

1) Verify GSTIN

Validate GSTIN format quickly and cross-check on the official portal for active status.

Use GSTIN Verify →

2) Find HSN Codes

Identify HSN chapter + likely GST rate hints for product/service invoicing.

Open HSN Search →

3) Create Invoice

Create professional GST invoices or quotations with clean PDF outputs.

Open Generator →

4) Calculate GST

Compute GST-inclusive/exclusive totals and cross-check invoice rounding.

Open GST Calculator →

Missing a tool?

We are constantly building new utilities for Indian businesses. Tell us what you need next.

Request a Feature →

Common Questions

Privacy, accuracy, and usage — quick answers.

Is my financial data safe on this website?
▾
Yes. Most calculators run client-side in your browser (no login needed for basic use). We don’t store your entries in a database for normal calculator usage. For file tools, read the privacy note shown on that tool page.
Are these calculators updated for FY 2025–26?
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We review and update tools when rules/notifications change. This hub was last reviewed on 7 May 2026. Always verify final filing rules on the GST portal.
Can I use these tools for official GST filing?
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Use these tools for calculation, cross-checks, and estimates — then file on the official GST Portal (gst.gov.in).
How accurate is the GSTIN Validator?
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It validates the GSTIN structure/format (checksum). It does not confirm active taxpayer status — verify on the GST portal.
Why do I see a small difference vs my invoice?
▾
Usually rounding differences (line-items vs total). Many tools include rounding options to match common invoice behavior.
Do I need to pay for downloads (PDF/Rate cards)?
▾
No. Tools and exports are free — we focus on a clean experience without paywalls.

Sources & verification

Use this hub for calculation and cross-checking. For filing and final compliance, verify using official sources.

GST Portal
Filing, return dashboards, notices, ledgers, official utilities.
gst.gov.in →
CBIC
Notifications, circulars, rates, and legal references.
cbic.gov.in →
GST Council
Council updates and public documents that affect GST rules.
gstcouncil.gov.in →
Accuracy Policy
What we assume, what we verify, and how to report mismatches.
Read policy →
Last reviewed: 7 May 2026 • Not legal advice

Next steps (popular workflows)

Deadlines → classification → reconciliation → estimates.

View All
GST Calculator

Quickly split GST amount for intra/inter state invoices.

Reverse GST Calculator

Remove GST from an inclusive amount and find taxable value.

GST Invoice Generator

Create printable GST quotations, proforma invoices and draft invoice summaries.

GSTR Due Date Finder

Find GST return due dates by form, period, frequency and state.