GST Calculator

How GST Calculator works

Add GST to a net amount or extract it from a tax-inclusive total, at any rate. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

Two directions, one formula

Adding GST takes a net amount and multiplies by (1 + rate/100). Removing GST takes a gross amount and divides by the same factor — note the division, not a subtraction of the same percentage.

That difference is the most common GST mistake. On 10,000 at 17%, adding gives 11,700. Removing 17% from 11,700 by subtraction gives 9,711, which is wrong; dividing by 1.17 gives back exactly 10,000.

The rate depends on where you are

The preset list covers the rates people actually search for: 0, 5, 10, 17, 18, 20 and 25 percent. Pakistan's standard rate is 17%, India uses slabs of 5/12/18/28, the UK is 20%, Australia 10% and Singapore 9%.

A rate not in the list can be typed if the calculator allows it — otherwise pick the closest and adjust, or use the percentage calculator for a one-off.

GST is not the same as income tax

GST is charged on the value of a supply and collected by the seller on behalf of the state. It is not a cost to a registered business that can claim input credit, and it is not a substitute for income tax on profit.

Whether a price should be quoted inclusive or exclusive is a legal and contractual question in most jurisdictions, not an arithmetic one. This tool shows both figures so the decision is at least made with the right numbers.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions

How this number is produced

The calculation is add: amount × (1 + rate/100); remove: amount ÷ (1 + rate/100), following standard tax-inclusive/exclusive arithmetic. The formula is repeated here so the result can be checked by hand rather than taken on trust.

This is a calculator, not advice. No clinician, accountant or adviser has reviewed it, and it cannot see your circumstances. For anything involving health, a loan, a tax filing or a religious obligation, confirm the figure with a qualified professional or the authority that publishes the rule.