Data rate
Download Time Calculator
Estimate download time from file size and connection speed using fixed bits-and-bytes math.
Estimate download time
This is a clean estimate from size and speed. Real downloads can be slower because of Wi-Fi, servers, overhead, and throttling.
How to use this calculator
- Enter the values the calculator asks for.
- Check the instant result and alternate values below it.
- Use the chart and formula to verify common examples.
download time calculator chart
| File size | Speed | Estimated time | Seconds |
|---|---|---|---|
| 100 MB | 50 Mbps | 16 sec | 16 sec |
| 1 GB | 100 Mbps | 1 min 20 sec | 80 sec |
| 10 GB | 100 Mbps | 13 min 20 sec | 800 sec |
| 5 GB | 25 MB/s | 3 min 20 sec | 200 sec |
| 50 GB | 1 Gbps | 6 min 40 sec | 400 sec |
Formula
seconds = file size in bytes x 8 / bits per second
Source
Fixed digital relationships: 1 byte = 8 bits, with decimal SI prefixes for transfer rates.
Common questions
How does the Download Time Calculator work?
Estimate download time from file size and connection speed using fixed bits-and-bytes math.
What formula does this calculator use?
seconds = file size in bytes x 8 / bits per second
Is the result exact?
Fixed digital relationships: 1 byte = 8 bits, with decimal SI prefixes for transfer rates. Some displayed values are rounded for readability, but the calculator keeps more precision internally.