Download and transfer time
Estimate transfer time from file size, link speed and your assumed efficiency.
Your inputs
The editable example is illustrative. Enter your own dimensions, operating data, prices, and fees. Results update as you edit.
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Your result
Complete the inputs to see your result.
How it works
- Ideal transfer time = File size (bit) ÷ Link speed per second (bit/s); Adjusted transfer time = Ideal transfer time ÷ Achieved throughput fraction (0–1)
- Worked example: 1 GB × 8 / (100 Mb/s) = 80 s; 80/0.8 = 100 s
- Supported input limits: File size: 0 ≤ x ≤ 1000000000000; Link speed per second: 1e-12 ≤ x ≤ 1000000000000; Achieved throughput fraction (0–1): 1e-9 ≤ x ≤ 1
Assumptions and limitations
Decimal SI prefixes use powers of 1000; binary IEC prefixes use 1024. One byte is eight bits. Transfer estimates assume constant throughput; video uses average bitrates and explicit overhead. Screen calculations assume square pixels. Printing preserves aspect ratio through fit or crop; image PPI is distinct from printer DPI. Exact storage ratios are retained; nonterminating decimal displays round to twelve places.
Sources
- NIST — conversion factor conventions Sources reviewed: 2026-10-06
- NIST — conversion factor table B.8 Sources reviewed: 2026-10-06
- NIST — decimal and binary prefixes Sources reviewed: 2026-10-06
