About Calculivo
Calculivo is a small independent project that builds free online calculators in multiple languages. Our goal is simple: when you search for a calculator, we want our result to load instantly, work correctly, and explain what it's doing — without a wall of pop-ups, sign-up screens, or video ads.
What we build
We focus on the calculators people actually search for: mortgages, loans, VAT, salary conversions, compound interest, profit margins, BMI, age, percentages, and construction estimates. Each one is hand-written in TypeScript, runs entirely in your browser, and is checked against multiple worked examples before publishing.
Every calculator ships in English, German, French and Spanish at minimum, with country-specific variants where it matters — separate VAT pages for 19% (Germany), 20% (France standard), 21% (Spain), 5.5% and 4% (reduced rates), and so on. The architecture is ready for 20+ more languages.
How we approach accuracy
Calculator code is open in the page source — no obfuscated WebAssembly, no remote API calls, no "AI guessing". Every formula we use is documented on the page where it's used, with at least one worked example and a frequently-asked-questions section.
We're not financial, legal, medical, engineering or tax advisors. Our calculators are reference tools. For decisions that depend on exact numbers — buying a house, filing taxes, planning major surgery — talk to a qualified professional.
How the site is funded
Calculivo is free and ad-supported. We display Google AdSense advertising — typically one banner above the calculator, one in the side rail on desktop, and one below the explanatory content. We deliberately don't run pop-ups, interstitials, autoplay video, or sticky ads that block content.
We don't track you for advertising without your consent. The cookie banner at the bottom of every page lets you accept or reject personalised ads — your choice is respected via Google's Consent Mode.
Technology
The site is built with Astro and TailwindCSS and shipped as static HTML. There is no backend, no database, no API. That's how pages load in under a second and how we keep the privacy footprint small.
Calculator logic is plain TypeScript compiled to a few kilobytes of vanilla JavaScript. No mathjs, no framework hydration, no third-party state managers.
Contact
Spotted a bug, found a typo, want a new calculator, or interested in working with us? Email hello@calculivo.com or visit the contact page.