About Us

Proportions Calculator is a free, beautifully designed online proportion calculator built for students, teachers, engineers, and professionals across every field. Our mission is simple: make mathematical tools accessible, fast, and genuinely delightful to use — no sign-ups, no ads, no hidden costs.

Whether you are solving homework problems, scaling architectural blueprints, adjusting cooking recipes, converting currency rates, or calculating pharmaceutical dosages, Proportions Calculator gives you instant, verified results with detailed step-by-step explanations that help you understand the math behind the answer.

Our tool uses the cross-multiplication method (A × D = B × C) to solve any proportion where one value is unknown. Simply enter three known values, leave one field empty or type 'x', and get your answer in milliseconds — complete with a full solution breakdown and verification proof.

We believe that education should be barrier-free. That is why Proportions Calculator is available in over 20 languages, works offline once loaded, and is optimized for every device — from desktop computers to tablets and smartphones. Our responsive design ensures a seamless experience no matter how you access it.

Built with modern web technologies including Astro, TypeScript, and Tailwind CSS, Proportions Calculator delivers lightning-fast performance with zero dependencies on external APIs. All calculations happen locally in your browser, meaning your data never leaves your device. Your privacy is fully protected.

Our commitment to quality extends to accessibility. We follow WCAG guidelines to ensure that Proportions Calculator is usable by everyone, including people who rely on screen readers and keyboard navigation. Mathematics should be inclusive, and we design with that principle at our core.

We are a passionate team of educators, developers, and designers who believe that the best tools are the ones that get out of your way and let you focus on learning. We continuously improve Proportions Calculator based on user feedback, adding new features, refining the interface, and expanding our educational blog content.

Thank you for choosing Proportions Calculator. We are honored to be part of your learning journey and professional toolkit.