⬇️Download Time Calculator
Download time depends on file size (in bits, not bytes) divided by connection speed. A common source of confusion: internet speeds are measured in bits per second (Mbps) while file sizes are in bytes (MB, GB). Since 1 byte = 8 bits, a 1 GB file requires 8 Gb (gigabits) of data transfer — so a 100 Mbps connection takes 80 seconds, not 10.
- 1Convert file size to bits: 1 KB = 8,000 bits, 1 MB = 8,000,000 bits, 1 GB = 8,000,000,000 bits
- 2Download time = file size in bits / speed in bits per second
- 3Theoretical maximum; real-world speeds are typically 60–90% of rated speed
1 GB file on 100 Mbps connection=80 seconds1GB = 8Gbits; 8,000/100 = 80 sec
4K movie (15 GB) on 50 Mbps=≈ 40 minutes15GB = 120Gbits; 120,000/50 = 2400 sec
4 MB photo on 4G (50 Mbps avg)=≈ 0.64 seconds
| File | Size | Time at 100 Mbps |
|---|---|---|
| Email attachment | 10 MB | < 1 second |
| MP3 song | 5 MB | < 1 second |
| HD movie (1080p) | 4 GB | ≈ 5.3 minutes |
| 4K movie (HDR) | 15 GB | ≈ 20 minutes |
| Video game (modern) | 50–100 GB | 1.1–2.2 hours |
| Windows 11 ISO | 5.1 GB | ≈ 6.8 minutes |
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