Bandwidth / Transfer Time Calculator
Bandwidth is the maximum rate of data transfer across a network connection, measured in bits per second (bps). Transfer time depends on file size and available bandwidth. Note: file sizes use bytes (B), while bandwidth uses bits (b) — 1 byte = 8 bits.
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Tip: ISPs advertise download speeds, not upload. Upload is typically 10-20% of download on cable. For video conferencing or uploading large files, check your upload speed separately.
- 1Convert file size to megabits: 1 MB = 8 Mb, 1 GB = 8,000 Mb
- 2Transfer time (seconds) = file size (Mb) / bandwidth (Mbps)
- 3Real-world speeds are typically 60–80% of advertised bandwidth
- 4Multiple simultaneous users further reduce available bandwidth
1 GB file on 100 Mbps connection=~80 seconds8,000 Mb / 100 Mbps = 80s
4K movie (15 GB) on 50 Mbps=~40 minutes120,000 Mb / 50 Mbps = 2,400s
| File Size | 10 Mbps | 100 Mbps | 1 Gbps |
|---|---|---|---|
| 1 MB | 0.8s | 0.08s | 0.008s |
| 100 MB | 80s | 8s | 0.8s |
| 1 GB | 13.3 min | 80s | 8s |
| 10 GB | 2.2 hr | 13.3 min | 80s |
| 1 TB | 9.3 days | 22.2 hr | 2.2 hr |
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Fun Fact
The first transatlantic telegraph cable in 1858 had a bandwidth of about 0.1 bits per second. Today, a single submarine cable can carry 400 terabits per second — 4 trillion times faster.
References
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