NigeriaEmbeddable widget

Embed a VAT calculator on your website

Add a lightweight VAT calculator through iframe or script, with attribution to calculariva.app and configurable parameters.

17 March 2026

Recommended iframe code

The iframe is the most stable option: it isolates styles, avoids conflicts with the host website and does not load the main app.

Iframe URL

https://calculariva.app/widget/vat-calculator?rate=21&mode=add&theme=light&lang=en-NG

<iframe src="https://calculariva.app/widget/vat-calculator?rate=21&mode=add&theme=light&lang=en-NG" title="VAT calculator" height="420" loading="lazy" style="border:0;width:100%;max-width:100%;"></iframe>

Automatic script

The script creates the iframe for you. You can adjust data-rate, data-mode and data-theme.

Script URL

https://calculariva.app/widget/vat-calculator.js?lang=en-NG

<script async src="https://calculariva.app/widget/vat-calculator.js?lang=en-NG" data-rate="21" data-mode="add" data-theme="light" data-lang="en-NG"></script>

Preview

rate: Initial VAT rate: 21, 10, 4, 0 or decimal.
mode: add to add VAT or remove to remove included VAT.
theme: light, dark or auto.

Visible formula

Recommended iframe: /widget/vat-calculator?rate=21&mode=add&theme=light

The widget can start in add VAT or remove VAT mode, set a default rate and choose light or dark theme.

Official sources

The widget does not load the main layout, ads, authentication or application sidebar.