ConvertNow is a free, fast, and accurate online unit converter. We built it because existing converters were slow, cluttered, or required sign-up. ConvertNow is none of those things.
ConvertNow is built and maintained by a small, independent team of software engineers who rely on unit conversion daily — in cooking, home improvement, travel, and engineering projects. We built the converter we wished existed: fast, ad-light, and transparent about the math behind every result.
ConvertNow supports over 500 unit conversions across 13 categories including length, weight, temperature, currency, area, volume, speed, time, digital storage, pressure, energy, and fuel economy. Every converter shows the formula used, so you always know exactly how the calculation works.
Every conversion factor on this site is cross-checked against internationally recognized standards before publishing, including the BIPM SI Brochure (the official definition of SI units), NIST Special Publication 811 (guide for use of the metric system), and ISO 80000 quantity standards. Currency conversions use live exchange rates refreshed hourly, with a cached fallback so the converter keeps working even if the rate feed is briefly unavailable.
Conversion factors and category content on this page were last reviewed in July 2026. Spotted an outdated figure? Let us knowand we'll correct it.
We use standard analytics (Google Analytics 4) to understand how people use the site — no personal data is collected. All conversions happen in your browser. We never sell data. Read our full Privacy Policy.
ConvertNow is a Progressive Web App (PWA). You can install it on your device from your browser and use it offline. Most unit converters work without an internet connection — only live currency rates require connectivity.
Found an error? Missing a unit? Want to suggest a feature? Contact us — we read every message and use accuracy reports to correct the site quickly.