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Calculate download times based on file size and connection speed. Convert Mbps to MB/s.
Download speed is the rate at which data is transferred from the internet to your device, measured in megabits per second (Mbps). It determines how quickly you can download files, stream video, and load web pages.
| Connection | Speed | 1GB Time |
|---|---|---|
| 3G Mobile | 7.2 Mbps | ~19 min |
| 4G LTE | 50 Mbps | ~2.7 min |
| 5G | 500 Mbps | ~16 sec |
| Fiber 1Gbps | 1000 Mbps | ~8 sec |
| USB 3.0 | 5 Gbps | ~1.6 sec |
Real-world speeds: Expect 70-90% of advertised speeds due to protocol overhead, network congestion, and other factors.
Upload vs Download: Most connections are asymmetric. Upload speeds are typically 10-20% of download speeds.
Formula
Download Time (sec) = File Size (bits) ÷ Speed (bps) | File Size (bits) = Bytes × 8File Size (bits) = file size converted from bytes — 1 byte = 8 bits
Speed (bps) = connection speed in bits per second (1 Mbps = 1,000,000 bps)
÷ 8 = converts bits to bytes for storage units
Worked Example
Download a 4 GB file on a 100 Mbps connection
Did you know? ISPs advertise speeds in megabits (Mb) but file sizes are shown in megabytes (MB). Since 1 byte = 8 bits, a 100 Mbps connection transfers files at 12.5 MB/s — not 100 MB/s. This is the most common source of confusion when estimating download times.
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