Built for speed.
Designed for accuracy.
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.
What We Offer
ConvertNow supports over 500 unit conversions across 13 categories including length, weight, temperature, currency, area, volume, speed, time, and digital storage. Every converter shows the formula used, so you always know exactly how the calculation works.
Accuracy
All conversions use internationally standardized constants (SI units, NIST standards). Currency conversions use live exchange rates updated hourly via external APIs, with a cached fallback to ensure the converter always works even when offline.
Privacy
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.
PWA & Offline Support
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.
Open to Feedback
Found an error? Missing a unit? Want to suggest a feature? Contact us — we read every message.