Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Decimal units: GB=10⁹ bytes, Mb=10⁶ bits. Assumes steady throughput; excludes startup latency.
Example Calculation
- File size: 1 GB (decimal)
- Link rate: 100 Mb/s
- Useful throughput fraction: 0.8
A decimal 1 GB file over 100 Mb/s at 80% useful throughput takes 100 s.
Frequently asked questions
How do I use this calculator?
Enter file size, link rate, useful throughput fraction. The result updates automatically. Use Reset to restore the example values.
What method does it use?
seconds=file GB × 8000 /(link Mb/s × useful fraction).. Decimal units: GB=10⁹ bytes, Mb=10⁶ bits. Assumes steady throughput; excludes startup latency.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.