Download Time Calculator

File Size

File Size Unit

Connection Speed

Mbps

Common Speeds

Download Time

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Time (% of 1 hour)—

Transfer rate—

Download Time

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File Size (MB)

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At 5 Mbps (DSL)

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At 100 Mbps (Cable)

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At 1 Gbps (Fiber)

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Transfer Rate (MB/s)

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Mbps vs. MB/s

Internet speeds are measured in megabits per second (Mbps). File sizes are measured in megabytes (MB). There are 8 bits in a byte, so a 100 Mbps connection transfers about 12.5 MB/s. A 4 GB file takes about 320 seconds (5.3 min) at that speed — in ideal conditions.

Real-World vs. Advertised Speed

Actual download speeds are typically 60–80% of the advertised maximum due to network overhead, server limits, WiFi interference, and congestion during peak hours. For large files, use a wired Ethernet connection for more reliable speeds.

File Size Reference