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GST Calculator

CGST + SGST / UTGST — India

₹
Live Breakdown
Enter an amount

Original Amount

Base value before GST

₹0.00

CGST @ 9%

Central Goods & Services Tax

₹0.00

SGST / UTGST @ 9%

State / Union Territory GST

₹0.00

Total GST

CGST + SGST (18%)

₹0.00

Total Payable

Amount + all taxes

₹0.00

For intra-state transactions. For inter-state, IGST applies (full rate).
This tool is for reference only — verify with a CA for compliance.

How Gst Calculator Works in Your Browser

The ToolsForgess GST calculator computes Goods and Services Tax additions and removals for any invoice amount and GST rate. Enter the base amount, select or type a custom GST percentage, and receive the tax-exclusive and tax-inclusive figures instantly. The engine supports standard Indian GST splitting into CGST and SGST components for intra-state transactions, as well as IGST for inter-state commerce. Every calculation executes entirely in the browser — no financial figures are transmitted to any server or stored beyond the active session. This tool is built for accountants, business owners, and freelancers who need to verify GST charges on invoices, reconcile vendor bills, or prepare pricing sheets that include accurate tax breakdowns for compliance documentation.

Key Features

  • Add GST to a base amount or remove GST from a tax-inclusive figure. The calculator determines the original amount and tax component with bidirectional calculation support.
  • Automatically split the GST amount into CGST and SGST halves for intra-state transactions, or compute IGST for inter-state supplies. The split is calculated at the exact statutory rate.
  • Support any GST rate from zero percent to one hundred percent with custom input. Standard rates like five, twelve, eighteen, and twenty-eight percent are available as quick-select presets.
  • All calculations execute client-side with zero network requests. Invoice amounts and tax rates remain private and are never logged or transmitted to external services.

Frequently Asked Questions

What GST rates are supported?
The calculator supports any percentage rate from zero to one hundred percent. Standard Indian GST slabs — five percent, twelve percent, eighteen percent, and twenty-eight percent — are available as quick-select buttons, and any custom rate can be entered manually.
Does it handle reverse charge mechanism?
The current implementation calculates standard forward-charge GST. Reverse charge calculations require determining whether the supply falls under the RCM list — consult your tax advisor for RCM-applicable transactions.
Can I calculate GST for multiple line items?
Apply the GST calculation to each line item individually, then sum the results. For invoice-level calculations, enter the total base amount to compute the aggregate tax liability.
Is the GST amount stored or reported?
No data leaves your browser. All computations are performed locally using JavaScript, and no tax figures, invoice amounts, or business details are transmitted to any external server.

All data processing for Gst Calculator runs 100% locally in your browser using client-side JavaScript. No data is uploaded to any server.

Technical Specification

GST Computation Engine & Tax Breakdown Generator

Overview

The ToolsForges GST calculator computes Goods and Services Tax amounts, inclusive and exclusive tax prices, and inter-state versus intra-state tax splits entirely within the browser. Enter the base amount and applicable GST slab percentage to receive an instantaneous breakdown of CGST, SGST, and IGST components. The calculator supports India's multi-tier GST structure with slabs at five, twelve, eighteen, and twenty-eight percent, as well as custom rates for specialized goods and services. All computations execute client-side, ensuring that your pricing data and financial figures remain private.

Feature Specifications

  • CGST and SGST SplitFor intra-state transactions, the calculator automatically splits the total GST equally between Central GST and State GST components, matching the format required on Indian tax invoices.
  • IGST ComputationFor inter-state transactions, compute the full IGST amount in a single field, reflecting the integrated tax structure applicable to cross-border supply within India.
  • Inclusive and Exclusive ModesCalculate GST on top of a base price or extract the base price from a GST-inclusive figure. Both directions provide complete breakdowns for accurate invoicing.
  • Custom Slab SupportBeyond the standard four slabs, enter any custom percentage for specialized goods, exempt categories, or zero-rated exports that fall outside the standard GST tiers.

Architecture

The calculator uses React state for input management and pure arithmetic for tax computation. The output panel renders all tax components simultaneously in a clean grid layout that adapts to mobile screens.

Frequently Asked Questions

What are the current GST slabs in India?

India's GST structure includes four primary slabs: five percent, twelve percent, eighteen percent, and twenty-eight percent. Certain essential items are zero-rated or fully exempt from GST.

When should I use IGST instead of CGST plus SGST?

Use IGST for inter-state transactions where the supplier and recipient are in different states. Use CGST plus SGST for intra-state transactions within the same state.

Can I calculate GST for reverse charge mechanism?

The calculator computes the tax amount regardless of who is liable to pay. Enter the applicable rate and amount, then apply the reverse charge label on your invoice as required.

Is my pricing data stored?

No. All amounts and tax computations are processed in-memory within your browser. No pricing data, business information, or financial figures are transmitted or stored externally.