Download Time Calculator
Your ISP says 250 Mbps. The question is: how long does a 50 GB game actually take to land? Enter your file size and plan speed and this calculator converts megabits into minutes for you, accounting for the bits-to-bytes gap that makes plans look 8x faster than they are.
Last updated: June 2026
Enter your file size and plan speed to see how long the download will take.
Quick reference
| File size | Line speed | Ideal time |
|---|---|---|
| 10 GB | 100 Mbps | about 13 min 39 sec |
| 50 GB | 250 Mbps | about 27 min 18 sec |
| 100 GB | 500 Mbps | about 27 min 18 sec |
| 1 TB | 1,000 Mbps | about 2 hr 16 min 32 sec |
Related tools and sections
From file size and speed to a realistic wait
This calculator earns its place in three situations where a quick mental estimate goes wrong:
- Planning a large update or backup window. A 100 GB console update at 500 Mbps is just over 26 minutes in ideal conditions, not seconds. Knowing that lets you schedule it overnight rather than during a match.
- Comparing ISP plans by actual file transfer benefit. Doubling from 100 Mbps to 200 Mbps cuts that same 100 GB to half the time. Doubling again to 400 Mbps halves it again. The calculator makes those trade-offs concrete before you commit to a plan.
- Deciding whether to wait or come back later. If a 15 GB game patch shows "about 4 min" on your connection, you sit and wait. If it shows "about 38 min," you go make coffee and come back.
Common mistakes that make the result look wrong:
- Forgetting the bits-to-bytes conversion. ISP plans are sold in megabits (Mbps). File sizes are in megabytes (MB). Divide the plan speed by 8 before doing the time math, or your estimate will be 8 times too optimistic. See the Mbps to MB/s converter for a full walkthrough of that conversion.
- Trusting the advertised plan speed as a guarantee. Your 250 Mbps plan is a ceiling, not a floor. On a busy shared line or over Wi-Fi two rooms from the router, 120 to 180 Mbps is more realistic. The calculator shows ideal time: add 30 to 50 percent for a safer estimate on Wi-Fi.
- Ignoring the server at the other end. A large game store or cloud provider can cap each individual connection regardless of how fast your line is. If a 15 GB download stalls at 20 MB/s while your plan should deliver 60 MB/s, the bottleneck is likely their server, not your connection.
Frequently Asked Questions
My ISP plan is 500 Mbps. Why does the calculator show 62.5 MB/s, not 500?
ISP plans are marketed in megabits per second (Mbps). File sizes and download progress bars use megabytes (MB). There are 8 bits in every byte, so 500 Mbps divided by 8 equals 62.5 MB/s. That 62.5 MB/s is the theoretical ceiling your plan allows before any other factor reduces it.
The calculator says 4 minutes but the download took 12 minutes. What happened?
The result is an ideal-conditions estimate assuming your full plan speed reaches the file the entire time. In practice, three things typically close that gap: Wi-Fi loses 20 to 50 percent of wired speed depending on distance and walls; the source server may cap each connection well below your line speed; and other devices or background processes share the line. On Wi-Fi, multiply the calculator result by 1.5 to 2 for a more realistic budget.
Is this calculator useful for uploads too?
Yes. The math is the same. Just use your upload speed instead of your download speed. Upload speeds on home broadband are usually a fraction of the download figure, often 20 to 50 Mbps on a 500 Mbps plan, so large backups or cloud uploads take far longer than downloads of the same file.
Can I use this for local network transfers between computers?
Yes. Local gigabit ethernet (1,000 Mbps) should get close to the theoretical speed shown here, usually 110 to 120 MB/s after overhead. Wi-Fi between computers is much slower (20 to 50 MB/s even on modern Wi-Fi 6), and the drive writing the data can also become the bottleneck if it is older spinning storage.
How do I find my actual connection speed rather than the advertised speed?
Run a speed test from a wired desktop (not Wi-Fi) with no other devices downloading. The result is as close to your true ceiling as you will get at home. That Mbps figure, divided by 8, is the MB/s number to plug in here for a realistic estimate rather than the number on your ISP bill.