SandSpan.com is a free online unit conversion platform built for students, engineers, scientists, chefs, travellers, and anyone who needs quick, reliable measurements. We believe that access to accurate conversion tools should be free, fast, and frustration-free — no sign-ups, no paywalls, no bloated software.
Our mission is simple: make unit conversion effortless for everyone, everywhere. Whether you're converting kilometres to miles on a road trip, grams to ounces in the kitchen, or megapascals to PSI in an engineering project, SandSpan has you covered with instant, accurate results.
SandSpan provides conversion tools across 10+ categories, including:
All conversion factors on SandSpan are sourced from internationally recognised standards, including the International System of Units (SI), the National Institute of Standards and Technology (NIST), and other authoritative bodies. We regularly review our conversion data to ensure it remains up to date and precise.
While we strive for the highest accuracy, please note that conversions involving rounded constants (such as the length of an average month) may carry minor approximations. For critical professional or scientific applications, always verify results against primary reference sources.
SandSpan.com is supported by display advertising through Google AdSense. We do not sell your personal data. We do not require registration. Your use of our tools is private and anonymous. Please read our Privacy Policy for full details on how we handle data.
We love hearing from our users. If you spot an error, have a suggestion, or want to request a new conversion category, please reach out via our Contact page. We typically respond within 1–2 business days.