calculate.at Calculators – Mortgage, BMI, Tip, Percentage & Unit Converter

Add a free, working calculator to any post or page with one shortcode. Pick a calculator, paste [calculate_at calculator="mortgage-calculator"], publish. There is nothing to configure: no account, no API key, no settings page.

The calculators run on calculate.at, so they always use the latest formulas and you never have to update anything. Each one resizes itself to fit its content (no scrollbar, no dead space) and works on phones, tablets and desktops.

Calculators you can embed

• Mortgage calculator (mortgage-calculator): monthly principal and interest, total payment with property tax and home insurance, total interest and loan amount from home price, down payment, rate and term. Good for real estate, mortgage and finance sites.
• BMI calculator (bmi-calculator): body mass index in metric (cm, kg) or imperial (ft, in, lb) with the standard adult categories. Good for health, fitness and wellness blogs.
• Tip calculator (tip-calculator): tip amount, total bill and split-the-bill share per person with 15%, 18%, 20% and 25% presets or a custom percentage. Good for restaurant, travel and lifestyle sites.
• Percentage calculator (percentage-calculator): what is X% of Y, X is what percent of Y, and X is Y% of what number. Good for education, business and how-to sites.
• Miles to km converter (miles-to-km): convert miles to kilometers with the exact factor 1 mile = 1.609344 km, with common race distances. Good for running, travel and cycling blogs.

How to use

1. Install and activate the plugin.
2. Edit a post or page and add the shortcode, for example [calculate_at calculator="tip-calculator"]. In the block editor use the Shortcode block; it also works in the Classic Editor and in page builders that have a shortcode element.
3. Publish. That is all.

Use the shortcode more than once with different calculator values to put several calculators on the same page.

Why use it

• Free, no signup. No account, API key or registration, ever required.
• Always up to date. The embedded calculator is a live page on calculate.at, so fixes and improvements arrive without a plugin update.
• Responsive and fast. The iframe is lazy-loaded, sized automatically, and only one tiny inline script is added per page (for the auto-resize).
• No cookies, no tracking from the calculator. The embedded calculator page loads no analytics scripts and sets no cookies.
• Clear results. Each calculator shows its result instantly and links to the full calculator page on calculate.at for more detail.

Want another calculator, a translation or a white-label version? Contact calculate.at: custom calculators, translations and builds without the attribution footer are available on request.

External service

This plugin displays calculators hosted on calculate.at, so it works only while calculate.at is reachable. When a page containing the shortcode is opened, the visitor’s browser loads the calculator from https://calculate.at/embed/<calculator>/ inside an iframe. That request sends the visitor’s IP address and browser details to calculate.at, like any web request. The plugin itself sends no other data, and the calculator page sets no cookies and runs no analytics. Values a visitor types into a calculator stay in their browser. Service terms: https://calculate.at/terms/. Privacy policy: https://calculate.at/privacy-policy/.

Disclaimer

The calculators give estimates for information only. They are not financial, medical or tax advice; a BMI value is a screening measure for adults, not a diagnosis.