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Download time depends on file size (bits) divided by connection speed (bits per second). Note that file sizes are measured in bytes while speeds are in bits — there are 8 bits per byte.
公式
Time(sec) = File size(bits) ÷ Speed(bps) = File size(bytes) × 8 ÷ Speed(bps)
- t
- Download Time (seconds)
- S
- File Size (bytes)
- b
- Connection Speed (bps)
ステップバイステップガイド
- 1File size in bits = File size (bytes) × 8
- 2Download time (seconds) = File size (bits) ÷ Speed (bps)
- 31 GB = 8 Gigabits; at 100 Mbps: 80 seconds
- 4Real-world speeds are typically 60–80% of advertised speeds
解いた例
入力
4 GB file on 100 Mbps connection
結果
≈5.3 minutes (320 seconds)
入力
4 GB file on 1 Gbps connection
結果
≈32 seconds
よくある質問
Why use bits instead of bytes?
Internet speeds are measured in bits per second because modems transmit one bit at a time. Files are measured in bytes (8 bits) for storage.
Why is my download slower than advertised?
Advertised speeds are maximums. Real-world speeds are 60–80% due to latency, packet loss, router overhead, and network congestion.
What does 1 Gbps mean in practical terms?
1 Gbps = 125 MB/s theoretical. With 80% efficiency, expect ≈100 MB/s, or about 10 seconds per gigabyte.
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