Free embeddable calculator widgets

Every calculator on this site can be dropped into your own website with a single line of HTML. There are 24 of them, covering income tax for AY 2026-27, GST, TDS, EMI, HRA, gratuity, capital gains and more. They are free to use, need no signup or API key, and there is no limit on traffic or on how many you place.

Why you might want one

If you write about Indian tax, personal finance, payroll or company compliance, the question your reader has at the end of an article is usually arithmetic: what would this actually cost me? Sending them to a third-party site to find out is where you lose them. An embedded calculator answers it on your page, which keeps the reader with you and gives them a reason to stay and to come back.

Building and maintaining one yourself is more work than it looks. The rates change with every Finance Act, the edge cases are fiddly — the Section 87A marginal relief alone is easy to get wrong in a way that quietly produces wrong answers — and a calculator that silently goes stale is worse than none. These widgets run the same unit-tested engine as the calculators on this site, so when the law changes they change with it and you do not have to do anything.

How to add one

Pick a widget below, press Copy embed code, and paste it into your page wherever you want the calculator to appear. It works in any HTML page, and in the HTML or custom-embed block of WordPress, Ghost, Webflow, Squarespace, Wix and most other site builders. There is nothing to install and no script tag to add.

Everything in the snippet is ordinary iframe markup, so adjust width, height and the inline style to suit your layout. A width of 100% works in most templates. The widget reports its own height to the parent page as it grows, so if you want the frame to follow the content you can listen for a postMessage whose type is ils-embed-height and set the iframe height from it.

The terms, in plain words

Use them on as many pages and sites as you like, commercial or not, at no cost. The one thing we ask is that the attribution line stays in the widget footer — it is a single line linking back to that calculator's page here, and it is the only thing we get out of this. Please do not strip it, hide it with CSS, or wrap the iframe in a way that conceals it.

Nothing a visitor types into a widget is sent to us. The calculations run entirely in their browser, there are no third-party cookies and no tracking inside the frame, so embedding one does not add a data-protection obligation to your page.

All 24 widgets

Each block below has a live preview link and the exact code to paste. The calc key in the URL is what selects the calculator, so you can also build the URL by hand if you prefer.

Frequently asked questions

Is it free to embed these calculators?

Yes. There is no charge, no signup, no API key and no usage limit. The only condition is that you keep the attribution link in the widget footer, which links back to the calculator's page on India Law Simplified.

Do I need to credit India Law Simplified?

The credit is already built into the widget — a single line in the footer linking to the calculator. Please leave it in place. Beyond that you do not need to add anything to your page.

Will the widget slow my page down?

It should not. The iframe is marked loading="lazy", so a browser only fetches it when the reader scrolls near it, and the widget bundle is around 42 KB gzipped with no tracking scripts or third-party cookies.

Does the widget resize itself?

Yes. It measures its own height and posts it to the parent page, so the iframe can grow when a result appears. If you want to react to that, listen for a message with type "ils-embed-height".

Can I change the width, height or border?

Yes. Everything in the snippet is ordinary iframe markup — edit width, height and the inline style freely. Width of 100% suits most layouts; height of 420 pixels fits the majority of the calculators before results expand.

Are the calculations kept up to date?

The widgets run the same calculation engine as the calculators on this site, which is unit-tested and updated when the law changes. You do not have to do anything when a Finance Act changes a rate — the embedded widget updates with it.

Is any data sent to you when someone uses the widget?

No. The calculations run entirely in the visitor's browser. Nothing typed into a widget is transmitted to us or stored.

Can I embed more than one widget on the same page?

Yes, there is no limit. Each iframe is independent, so you can put a tax calculator and an EMI calculator on the same page without them interfering.

Something missing?

If you need a calculator that is not in the list, or a variant of one that fits your audience better, the calculators on this site are driven by a shared engine and adding a new widget is usually straightforward. The full set of interactive tools lives on the free calculators page, and the reference guides behind them are in the learning hub.

The widgets are estimation tools for general understanding, not professional advice, and they carry that note inside the frame. Figures follow AY 2026-27 rules unless stated otherwise — verify anything consequential with a qualified CA or advocate.