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About the Download Time Calculator
The download time calculator estimates how long it takes to transfer a file at a given internet speed. The same calculation works for uploads when you enter your upload speed.
You enter the file size in KB, MB, GB or TB and the connection speed in Kbps, Mbps, Gbps or MB per second. The result shows the estimated time, the ideal time at the full advertised speed, the amount of data in megabits and the speed in megabytes per second. The overhead option adds about 10 percent to allow for the extra data that networks send with every file, which gives a more realistic estimate.
How to Use the Download Time Calculator
- Enter the file size and choose its unit.
- Enter your connection speed and choose its unit.
- Keep the overhead box ticked for a real world estimate, or untick it for the ideal time.
- Read the download time in the result panel.
How Download Time Is Calculated
5 GB = 5,000 MB = 40,000 megabits
40,000 ÷ 100 Mbps = 400 seconds = 6 min 40 s
With 10% overhead: 400 ÷ 0.9 = 444 seconds = 7 min 24 s
Megabits Versus Megabytes
Internet speeds are measured in megabits per second (Mbps, small b). File sizes are measured in megabytes (MB, capital B). One byte equals 8 bits, so divide Mbps by 8 to get megabytes per second. A 100 Mbps connection moves at most 12.5 MB per second.
Download Time Chart
| File | 25 Mbps | 100 Mbps | 300 Mbps | 500 Mbps | 1 Gbps |
|---|---|---|---|---|---|
| 5 MB song | 2 s | under 1 s | under 1 s | under 1 s | under 1 s |
| 100 MB app | 32 s | 8 s | 3 s | 2 s | under 1 s |
| 1 GB | 5 min 20 s | 1 min 20 s | 27 s | 16 s | 8 s |
| 4 GB HD movie | 21 min 20 s | 5 min 20 s | 1 min 47 s | 1 min 4 s | 32 s |
| 25 GB | 2 h 13 min 20 s | 33 min 20 s | 11 min 7 s | 6 min 40 s | 3 min 20 s |
| 50 GB game | 4 h 26 min 40 s | 1 h 6 min 40 s | 22 min 13 s | 13 min 20 s | 6 min 40 s |
| 150 GB game | 13 h 20 min | 3 h 20 min | 1 h 6 min 40 s | 40 min | 20 min |
Ideal times at the full advertised speed, using 1 MB = 1,000,000 bytes. Expect real downloads to take a little longer.
Why Real Downloads Are Slower
- Protocol overhead: networks send extra data with each file for addressing and error checking.
- Wi-Fi: walls, distance and interference reduce wireless speed. A wired connection is usually faster.
- Server limits: the site you download from may cap speed per user.
- Shared bandwidth: other devices and streams on your network use part of the speed.
- Advertised speeds are maximums: busy hours can lower real speed.
What Counts as Fast Internet?
In March 2024, the Federal Communications Commission set the US broadband benchmark at 100 Mbps download and 20 Mbps upload, up from 25 and 3 Mbps set in 2015. Upload speeds on cable plans are often much lower than download speeds, so uploads take longer. Fiber plans often have equal download and upload speeds.
GB Versus GiB
Internet providers and storage makers use decimal units: 1 GB = 1,000,000,000 bytes. Windows reports sizes in binary units, where 1 “GB” is actually 1 GiB, or 1,073,741,824 bytes. That is why a 1 TB drive shows as about 931 GB in Windows. This calculator uses decimal units.
Frequently Asked Questions
What is a download time calculator?
A download time calculator is a tool that estimates how long a file takes to download by dividing the file size in bits by the connection speed in bits per second.
How long does it take to download 1 GB?
At 100 Mbps, 1 GB takes about 80 seconds at full speed, or about 1 minute 30 seconds with normal overhead. At 25 Mbps it takes about 5 minutes 20 seconds.
How many MB per second is 100 Mbps?
100 Mbps equals 12.5 megabytes per second. Divide megabits by 8 to get megabytes.
What is the difference between MB and Mb?
MB means megabytes and is used for file sizes. Mb means megabits and is used for internet speeds. One megabyte equals 8 megabits.
How do I calculate upload time?
Use the same calculator with your upload speed instead of your download speed.
Why is my download slower than my internet speed?
Downloads lose speed to network overhead, Wi-Fi interference, server limits and other devices on your network. Real downloads often run 10 percent or more below the advertised speed.
Is 100 Mbps fast internet?
100 Mbps download meets the current FCC broadband benchmark and handles several HD streams and video calls at once.