# File Download Time Calculator

Calculate how long it takes to download or transfer a file. Choose from preset connection speeds (3G to Gigabit) or enter a custom speed.

## What this calculates

How long will that file take to download? Select your connection type or enter a custom speed, and this calculator shows exactly how long any file transfer will take. Includes presets for common connections from 3G mobile to Gigabit fiber and USB transfers.

## Inputs

- **File Size** — min 0.001
- **File Size Unit** — options: Megabytes (MB), Gigabytes (GB), Terabytes (TB)
- **Connection Type** — options: 3G Mobile (5 Mbps), 4G/LTE (35 Mbps), 5G (200 Mbps), DSL (25 Mbps), Cable (100 Mbps), Fiber (500 Mbps), Gigabit Fiber (1 Gbps), USB 2.0 (480 Mbps), USB 3.0 (5 Gbps), Custom Speed
- **Custom Speed (Mbps)** (Mbps) — min 0.1 — Used when 'Custom Speed' is selected

## Outputs

- **Transfer Time** — formatted as text
- **Total Seconds**
- **Transfer Speed**

## Details

Common download scenarios:

  - Music album (200 MB): 16 sec on cable, 1.6 sec on gigabit

  - HD movie (4 GB): 5 min on cable, 32 sec on gigabit

  - 4K movie (20 GB): 27 min on cable, 3 min on gigabit

  - Video game (80 GB): 1 hr 47 min on cable, 11 min on gigabit

Remember: advertised speeds are in megabits (Mb), while files are measured in megabytes (MB). Divide the speed by 8 to get the actual download rate in MB/s.

## Frequently Asked Questions

**Q: Why is my download slower than the calculated time?**

A: Real-world speeds are affected by network congestion, server speed limits, distance to the server, Wi-Fi interference, and protocol overhead. Expect 50-80% of your connection's maximum speed in practice.

**Q: What is the difference between Mbps and MB/s?**

A: Mbps (megabits per second) is used by ISPs for connection speeds. MB/s (megabytes per second) is used for file sizes. Since 1 byte = 8 bits, divide Mbps by 8 to get MB/s. So 100 Mbps = 12.5 MB/s.

**Q: Which is faster, USB 2.0 or USB 3.0?**

A: USB 3.0 is about 10x faster than USB 2.0 in theory. USB 2.0 maxes out at 480 Mbps (60 MB/s), while USB 3.0 reaches 5 Gbps (625 MB/s). Real-world speeds are typically 30-50% of these maximums.

**Q: How fast is 5G compared to 4G?**

A: 5G is roughly 5-10x faster than 4G in real-world conditions. 4G/LTE typically delivers 25-50 Mbps, while 5G ranges from 50-300 Mbps on sub-6 GHz and 1-4 Gbps on mmWave. Availability and speeds vary greatly by location.

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Source: https://vastcalc.com/calculators/technology/download-time
Category: Technology
Last updated: 2026-04-21