ClarityHow to use this converter
- Enter file size, file-size unit, connection speed (mbps), usable throughput (%).
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
Input reference and sample values
Use the units and choices shown for each field. Sample values are provided for practice, not as recommendations.
| Input | Format and units | Sample |
|---|---|---|
| File size | Numeric value. Zero or positive. | 1 |
| File-size unit | Choose MB (decimal) / GB (decimal) / MiB (binary) / GiB (binary). | GB (decimal) |
| Connection speed (Mbps) | Numeric value. Minimum: 0.000001. | 100 |
| Usable throughput (%) | Numeric value. Minimum: 0.01. Maximum: 100. | 100 |
Result for these sample inputs
80 seconds
- Minutes
- 1.33333333
- Hours
- 0.0222222222
- Effective rate (Mbps)
- 100
Select Try the example in the form to load these values and calculate them again. This replaces the current form inputs. Compare the result with the method and worked explanation below.
The method, explained
Seconds = file bytes × 8 ÷ (megabits per second × 1,000,000 × usable-throughput fraction). One GB is 1,000,000,000 bytes; one GiB is 1,073,741,824 bytes.
A 1 GB file over a 100 Mbps connection takes 80 seconds at 100% usable throughput, or 100 seconds at 80%.
What to keep in mind
An estimate for a steady data rate. It excludes startup delays, server limits, compression, changing Wi-Fi quality and pauses. Usable throughput is your assumption, not a measured network speed.
Common questions
Why multiply file size by eight?
Files are measured in bytes while connection speeds usually use bits; one byte contains eight bits.
Does this run a speed test?
No. It sends no test downloads; enter a measured or advertised connection speed yourself.
Methodology maintained by ClarityKit. How these tools are built and checked.