Tech calculator
Download Time Calculator
Find out how long a file, game, or update will take to download from its size and your internet speed, in any mix of MB, GB, Mbps, or MB/s.
Estimated download time
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Ideal estimate. Real-world download speeds may vary.
How does the Download Time Calculator work?
Enter the size of the file you want to download and your internet download speed. Calquo converts both values into compatible units and estimates how long the transfer would take under ideal conditions.
What's the difference between Mbps and MB/s?
Internet speeds are commonly advertised in megabits per second (Mbps), while file sizes and download programs often use megabytes (MB).
That means a 300 Mbps internet connection has a theoretical maximum transfer rate of:
Example: How long does a 100 GB game take to download?
Suppose you are downloading a 100 GB game with a 300 Mbps internet connection.
Why is my actual download slower?
The result is an ideal estimate. Your actual download may take longer because of Wi-Fi conditions, network congestion, server speed, other devices using your connection, protocol overhead, hardware limitations, or your internet provider.
Frequently asked questions
How long does a 100 GB download take at 100 Mbps?
Under ideal conditions, 100 Mbps equals 12.5 MB/s. A 100 GB file would therefore take about 2 hours and 13 minutes to download.
How long does a 100 GB download take at 1 Gbps?
Under ideal conditions, 1 Gbps equals 125 MB/s. A 100 GB file would take about 13 minutes and 20 seconds.
Is 1 Gbps the same as 1 GB/s?
No. Gbps means gigabits per second, while GB/s means gigabytes per second. Since there are eight bits in one byte, 1 Gbps equals a theoretical maximum of 125 MB/s, or 0.125 GB/s.
Can I use this calculator for game downloads?
Yes. You can use it for games, software, operating system updates, videos, backups, cloud files, and other downloads.
How the download time calculator works
Enter the size of the file in megabytes, gigabytes, or terabytes, then enter your download speed in megabits per second (Mbps), gigabits per second (Gbps), or megabytes per second (MB/s). The calculator converts the file size to megabytes and the speed to megabytes per second, divides one by the other, and shows the result as days, hours, minutes, and seconds, rounded to the nearest second.
The results panel also shows the speed converted to MB/s, which is the number most download managers and game launchers display, and the raw total in seconds. The figure is an ideal estimate that assumes the connection runs at full speed for the whole transfer; the next sections explain why real downloads usually take somewhat longer.
Download time formula
Say you are downloading a 100 GB game on a 300 Mbps connection. The file is 100 × 1,000 = 100,000 MB. The speed is 300 ÷ 8 = 37.5 MB/s. Dividing gives 100,000 ÷ 37.5 = 2,666.67 seconds, which the calculator reports as 44 minutes 27 seconds.
On a 50 Mbps connection the same transfer runs at 6.25 MB/s and takes 16,000 seconds, or 4 hours 26 minutes 40 seconds. On gigabit fiber at 125 MB/s it takes 800 seconds, or 13 minutes 20 seconds.
Megabits versus megabytes
Internet providers advertise speeds in megabits per second, but file sizes are measured in bytes, and there are 8 bits in a byte. A 100 Mbps plan therefore moves at most 12.5 megabytes per second, and a 1 Gbps plan at most 125 MB/s. Mixing up the two units is the most common reason people expect a download to finish eight times faster than it does. Watch the capitalization: a lowercase b (Mb) means bits and an uppercase B (MB) means bytes.
The calculator uses decimal units, where 1 GB is 1,000 MB and 1 TB is 1,000,000 MB. That matches how storage makers, game stores, and most download pages label sizes. Windows, however, reports sizes in binary units (1 GB shown as 1,024 × 1,024 × 1,024 bytes), so a file that Windows Explorer lists as 50 GB is about 53.7 GB in decimal terms. For a closer estimate, multiply a Windows size by 1.074 before entering it.
Why real downloads take longer than the estimate
The number from a speed test is the ceiling of your connection, not the speed any single download will sustain. Several things eat into it, and together they typically add 5 to 20 percent to the ideal time, and far more on congested Wi-Fi.
- Protocol overhead: TCP/IP headers and encryption consume a few percent of the raw bandwidth
- Server limits: the site or content delivery network may cap each connection well below your plan speed
- Wi-Fi: distance, walls, and interference often cut throughput to a fraction of the wired speed
- Other traffic: streaming, video calls, cloud backups, and other devices share the same link
- Peak hours: cable and shared connections slow down in the evening when neighbors are online
- Disk speed and unpacking: game launchers decompress and verify files as they download, and slow hard drives can become the bottleneck
Typical file sizes for reference
If you do not know the exact size, these ranges are a reasonable starting point. Game sizes in particular have grown quickly, and the installed size is often larger than the download because files are compressed in transit.
- Smartphone photo: 3 to 6 MB; a song in MP3 format: 5 to 10 MB
- One hour of 1080p streaming video saved offline: about 1.5 to 3 GB
- Full-length movie: 4 to 8 GB in 1080p, 15 to 25 GB in 4K
- Operating system update: 3 to 7 GB; a full Windows installer: about 6 GB
- Major AAA game: 70 to 150 GB, with some exceeding 200 GB
- Full backup of a laptop: 250 GB to 1 TB
Frequently asked questions
How long does it take to download 1 GB at 100 Mbps?
About 80 seconds. 100 Mbps is 12.5 MB/s, and 1 GB is 1,000 MB, so 1,000 ÷ 12.5 = 80 seconds under ideal conditions. Expect closer to a minute and a half in practice.
How long does a 100 GB game take to download?
At 100 Mbps it takes about 2 hours 13 minutes; at 300 Mbps about 44 minutes; at 500 Mbps about 27 minutes; and at 1 Gbps about 13 minutes. These are ideal figures before server limits and Wi-Fi losses.
What is the difference between Mbps and MB/s?
Mbps is megabits per second and MB/s is megabytes per second. There are 8 bits in a byte, so divide Mbps by 8 to get MB/s. A 400 Mbps connection downloads at up to 50 MB/s.
Why is my download slower than my internet speed?
Speed tests measure the best your connection can do, while a single download is limited by the server, Wi-Fi conditions, other devices on the network, protocol overhead, and sometimes your disk. Running a download over Ethernet instead of Wi-Fi usually closes much of the gap.
Is 1 GB equal to 1,000 MB or 1,024 MB?
This calculator uses 1 GB = 1,000 MB, the decimal convention used by storage manufacturers and most download pages. Windows uses 1,024, so sizes shown in Windows Explorer are about 7 percent larger in decimal units.
How long does 1 TB take to download on gigabit internet?
At 1 Gbps, which is 125 MB/s, 1 TB (1,000,000 MB) takes 8,000 seconds, or 2 hours 13 minutes 20 seconds, under ideal conditions. Real-world transfers of that size often take three hours or more.