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Download Time Calculator
Enter file size and download speed. The estimated time appears big and instantly. (Remember: Mbps is different from MB/s.)
1) Choose how to enter speed
Most ISP plans are in Mbps
2) Enter file size + speed
Result updates as you type
Heads up: 100 Mbps ≈ 12.5 MB/s (divide by 8).
Optional: Upload time
Same idea, different speed
If you click “Use upload speed”, the calculator uses that speed instead of download speed.
Quick Formulas
Simple rules
Time (seconds) = File size (MB) ÷ Speed (MB/s)
MB/s = Mbps ÷ 8
File size (MB) = GB × 1024 (binary) or GB × 1000 (decimal)
Reference Tables
Quick feel for times
| Speed (Mbps) | Approx MB/s |
|---|---|
| 25 | 3.125 |
| 50 | 6.25 |
| 100 | 12.5 |
| 200 | 25 |
| 500 | 62.5 |
| 1000 | 125 |
Real-World Examples
Common situations
- 10 GB at 100 Mbps (10% overhead) → about 15 minutes.
- 2 GB at 20 MB/s → about 1 minute 42 seconds.
- 50 GB at 500 Mbps (10% overhead) → about 15 minutes.
Common mistake: Confusing Mb (megabits) with MB (megabytes). 1 byte = 8 bits.
FAQ
Short answers
Why is real time slower? Wi-Fi quality, server limits, congestion, protocol overhead, VPNs, and disk speed.
Should I use Mbps or MB/s? ISP plans are usually Mbps; download tools often show MB/s.
Is 1 GB 1000 or 1024 MB? Both exist. This calculator uses 1024 MB/GB.
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