Free Calculator Widgets for Your Website
Add useful calculators to your website with simple responsive iframe widgets. No account required.
How Calculator Embeds Work
- Choose a calculator.
- Copy the embed code.
- Paste it into your website's HTML.
Why Use CalcMetrio Widgets?
- Free — No cost and no usage limits.
- Responsive — Widgets adapt to mobile and desktop layouts.
- No account required — Copy and paste — no signup, no API key.
- Browser-based calculations — Math runs in the visitor's browser; inputs are not sent to CalcMetrio for calculation.
- Lightweight — A single iframe — no libraries to install.
- Mobile-friendly — Touch targets and readable text at small widths.
Available Calculator Widgets
Break-Even ROAS Calculator
Find the minimum ROAS needed to cover your product and variable costs.
Open in CalcMetrio →Target ROAS Calculator
Estimate a planning ROAS target based on your costs and desired profit margin.
Open in CalcMetrio →Profit Margin Calculator
Find gross, operating or net margin from revenue and cost figures.
Open in CalcMetrio →Sales Tax Calculator
Add or remove sales tax using any custom rate, with quantity support.
Open in CalcMetrio →Embedding Guidelines
- Do not alter or conceal the attribution.
- Do not use widgets for misleading or fraudulent purposes.
- Do not imply CalcMetrio endorses the third-party website.