Skip to main content

Download Time Calculator

Estimate how long a game, update, or file will take to download. Enter the file size and your internet speed for a realistic estimate.

  • Free
  • No account needed
  • Works in your browser
GB
Mbps

Common game sizes

Common speeds

Estimated download time

47m 3s

realistic estimate (85% efficiency)

Theoretical best40m
Realistic (85%)47m 3s
File size30.0 GB
Effective speed12.5 MB/s

Was this tool helpful?

How download time is calculated

The math behind the estimate.

The formula is straightforward: divide the file size by your download speed. Sizes use 1 GB = 1,000 MB, the same units game stores and ISPs use. A 30 GB file at 100 Mbps takes 30,000 MB / 12.5 MB/s = 2,400 seconds, or 40 minutes at full speed.

In practice, you rarely see 100% of your advertised speed. TCP overhead, routing hops, server capacity, Wi-Fi signal quality, and background traffic all reduce throughput. This calculator applies an 85% efficiency factor, which is conservative for most home connections.

For wired connections on uncongested networks, you might see 90-95% efficiency. On Wi-Fi during peak hours, it can drop to 60-70%. If your downloads consistently underperform, run a speed test to check your actual throughput.

Download time FAQ

Common questions about download speeds and estimates.

At 100 Mbps, a 100 GB file takes about 2 hours and 37 minutes (realistic estimate with 85% efficiency). At 50 Mbps, about 5 hours and 14 minutes. At 1 Gbps, about 16 minutes.
Mbps (megabits per second) is the unit ISPs use to advertise speeds. MB/s (megabytes per second) is what download managers typically show. 1 MB/s = 8 Mbps. Divide your ISP speed by 8 to get MB/s.
Real downloads rarely reach your maximum ISP speed. Common reasons: TCP protocol overhead (5-10%), server-side throttling, network congestion during peak hours, Wi-Fi signal loss, and background apps consuming bandwidth. This calculator uses 85% efficiency to account for these factors.
A 60 GB game at 50 Mbps takes about 3 hours and 8 minutes (realistic estimate with 85% efficiency). At 100 Mbps, about 1 hour and 34 minutes. At 250 Mbps, about 38 minutes. Steam may throttle downloads during peak hours, so actual times can vary.
100 Mbps is solid for most gamers. A typical 30 GB game downloads in about 47 minutes. A large 100 GB game takes about 2 hours and 37 minutes. For frequent large downloads, 250+ Mbps saves meaningful time.
At 1 Gbps (1000 Mbps), a 30 GB game downloads in about 5 minutes. A 100 GB game takes about 16 minutes. In practice, your SSD write speed or the game server may become the bottleneck before your internet connection does.

Up next