RandoziFile Download Time Calculator
Enter the size of the file and the speed of your connection to see how long the download takes, in days, hours, minutes and seconds. You can then lower the speed to what you really get, find the speed needed to finish in a set time, and compare the same file at other speeds.
Download time
1 min 20 s
Real-world speed
The speed you pay for is rarely all available to one file. The page does not know your share: leave 100 for the ideal case, then try a lower value to see the effect, or run a speed test for your own figure. Empty means 100.
Speed needed for a target time
Minimum line speed
26.6667 Mbps
The same file at other speeds
Change the speeds in the first column to try your own, in Mbps. The share above is applied.
| Line speed (Mbps) | Time | Seconds |
|---|---|---|
| 13 min 20 s | 800 | |
| 2 min 40 s | 160 | |
| 1 min 20 s | 80 | |
| 16 s | 16 | |
| 8 s | 8 |
A byte is 8 bits. KB, MB, GB and TB are decimal (1 MB = 1,000,000 bytes); KiB, MiB, GiB and TiB are binary (1 MiB = 1,048,576 bytes). 1 MB/s = 8 Mbps. A calculation from the figures entered: it does not measure your connection and nothing you type leaves your browser.
How it works
- Enter the file size and pick its unit. KB, MB and GB are decimal; KiB, MiB and GiB are binary.
- Enter the speed and pick its unit: kbps, Mbps, Gbps, KB/s or MB/s.
- Read the time. Under the result, lower the usable share if you get less than the advertised speed.
- Optionally type a target time to see the speed you need, and compare the file at other speeds.
What people use it for
Planning a big download
Know whether a large game or a system update fits in your evening before you start it.
Comparing internet plans
See how long the same backup takes at 50, 100 and 500 Mbps before you decide on a faster plan.
Uploading to a client or a cloud drive
Estimate a video export or a photo archive with your upload speed instead of your download speed.
Questions
- How is the time calculated?
- Time in seconds = file size in bytes × 8 ÷ (speed in bits per second × usable share). A byte is 8 bits. For 100 MB at 20 Mbps with the whole speed usable: 100,000,000 × 8 ÷ 20,000,000 = 40 seconds.
- What is the difference between MB and MiB, or Mbps and MB/s?
- KB, MB, GB and TB use powers of 1,000 (1 MB = 1,000,000 bytes). KiB, MiB, GiB and TiB use powers of 1,024 (1 MiB = 1,048,576 bytes), so 1 GiB is about 7.4 % more than 1 GB. Some programs show binary sizes with decimal names, so check which one your file uses. Mbps counts megabits per second and MB/s megabytes per second: 1 MB/s = 8 Mbps.
- Why would my real download be slower than the result?
- The result assumes that all the speed you enter goes to this file. Wi-Fi, other devices, the server, the network route and protocol overhead can take a part. Use the usable share to try a lower figure. The page does not know your real share and does not measure your connection.
- How is the speed needed calculated?
- Effective speed = file size in bits ÷ target time in seconds. The line speed to look for is that figure divided by the usable share. 1 GB in 80 seconds needs 8,000,000,000 ÷ 80 = 100 Mbps at a 100 % share. It is a minimum: any slowdown makes the real time longer.