Free online bandwidth calculator. Calculate download time, upload time, or required bandwidth instantly. Supports multiple units. Pure client-side, no ads.
This bandwidth calculator helps you estimate download times, upload times, and required network speeds. Whether you are downloading a game, uploading a video, or planning network infrastructure — get instant, accurate results. All calculations happen in your browser with no data sent to any server.
Download time = (File Size in bits) / (Network Speed in bits per second). First convert your file size to bits (multiply by 8), then divide by your network speed in bps. Our calculator does this automatically for any units you choose.
Real-world network transfers have protocol overhead (TCP/IP headers, handshakes, congestion control) and rarely reach the advertised maximum speed. We add a 10% overhead factor to give you a more practical estimate.
MB/s (megabytes per second) and Mbps (megabits per second) measure the same thing but in different units. 1 MB/s = 8 Mbps. Internet providers typically advertise speeds in Mbps, while file downloads often show MB/s.
Yes, completely free. No ads, no registration, no limits. All calculations happen in your browser.