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GST & Tax · Local-first

GST Calculator

Calculate GST on an exclusive or inclusive amount with an explicit tax-component choice.

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Check the method before you rely on the result

Tier D · Runs locally in this browser
Method
Effective-dated GST arithmetic with explicit inclusive/exclusive and supply-split choices.
Exclusive: GST = taxable value × rate ÷ 100. Inclusive: taxable value = total ÷ (1 + rate ÷ 100).
Sources
5 reviewed references · 5 official
Open the source register
Effective period
22 September 2025 onward
Last verified
8 August 2026
Review every 180 days
Reviewer status
Independent CA or tax reviewer: external review pending
Privacy
The amount, rate choice, mode, supply type and calculated tax stay in this browser. They are not sent to analytics, a backend, a URL or a log.
Important limitations
  • The 5% and 18% choices are source-backed headline presets, not a classification decision. The calculator does not determine whether they apply to a particular product or service.
  • It does not determine taxability, HSN/SAC, exemption, reverse charge, input tax credit, compensation cess, registration, filing, export treatment or legal place of supply.

Read all limitationsReport an error

Browse GST & Tax · Methodology · Sources

A quick guide

Use the number with context

The answer is only useful when you know what it includes and what it leaves out.

How to use it

  1. Enter a positive amount with up to two decimal places.
  2. Choose a source-backed headline rate or select a clearly labelled custom rate if you already know the rate to use.
  3. Choose whether the amount is GST exclusive or already GST inclusive, then select the tax split you need. The calculator does not infer place of supply.

Formula

Exclusive: GST = taxable value × rate ÷ 100. Inclusive: taxable value = total ÷ (1 + rate ÷ 100).

The result shows arithmetic for the values selected. A source-backed preset does not mean that the rate is legally applicable to your product, service or transaction.

Make it concrete

Worked example

For a ₹1,000 exclusive amount at 18%, GST is ₹180.00 and the total is ₹1,180.00. This numeric example demonstrates the formula only; it does not classify a supply.

Boundaries

What this tool does not assume

Limitations

  • The 5% and 18% choices are source-backed headline presets, not a classification decision. The calculator does not determine whether they apply to a particular product or service.
  • It does not determine taxability, HSN/SAC, exemption, reverse charge, input tax credit, compensation cess, registration, filing, export treatment or legal place of supply.
  • Intra-state results use cautious “CGST + SGST/UTGST” wording because the calculator has no verified location model to choose State tax versus Union Territory tax.

Edge cases

  • Amounts must be finite, positive, at most two decimal places and no more than ₹999,999,999,999,999.99.
  • Custom rates allow 0% through 100% with at most two decimal places and always carry a user-responsibility warning.
  • Currency values use half-up rounding. Intra-state components reconcile by assigning the rounded remainder to SGST/UTGST.

Last reviewed 8 August 2026 · Formula version 1.0

Method & sources

How this result is grounded

The formula is deterministic and runs in your browser. Read the reference below for the method used by this tool.

  • Notification No. 09/2025-Central Tax (Rate)

    Central Board of Indirect Taxes and Customs · official reference · Checked 8 August 2026

    Authority: CBIC · 09/2025-Central Tax (Rate) · Published 17 September 2025

    Supports: post-reform rate schedule context · effective-date verification

    Effective 22 September 2025
  • 56th GST Council meeting press release

    Goods and Services Tax Council · official reference · Checked 8 August 2026

    Authority: GST_COUNCIL · Release ID 2163555 · Published 3 September 2025

    Supports: headline rate structure · effective-date context · regulatory limitations

    Effective 22 September 2025
  • GST Reforms 2025: Relief for Common Man, Boost for Businesses

    Press Information Bureau, Government of India · official reference · Checked 8 August 2026

    Authority: OTHER_GOVERNMENT · Published 4 September 2025

    Supports: headline rate structure · classification limitation

    Effective 22 September 2025
  • Nine Years of GST: Simplifying Taxation, Strengthening India

    Press Information Bureau, Government of India · official reference · Checked 8 August 2026

    Authority: OTHER_GOVERNMENT · Published 30 June 2026

    Supports: current headline-rate verification · CGST/SGST and IGST context · special-rate exclusion

    Effective 22 September 2025
  • GST Council April 2026 newsletter

    Goods and Services Tax Council · official reference · Checked 8 August 2026

    Authority: GST_COUNCIL · 01/2026-Central Tax (Rate) · Published 1 May 2026

    Supports: subsequent-update review · classification limitation

    Effective 1 May 2026

Questions

Frequently asked

Does the calculator tell me which GST rate applies?

No. It offers two source-backed headline choices and a custom-rate option, but it does not classify products or services or recommend a rate.

Does intra-state always mean SGST rather than UTGST?

The calculator does not decide that. It labels the second component SGST/UTGST until a verified location model is added.

Are my amounts sent anywhere?

No. The calculation runs in this browser and financial inputs and results are excluded from analytics and logs.

Keep going

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Source register checked 8 August 2026.