File Transfer Time Calculator
Estimate how long it takes to transfer a file over USB, WiFi, Ethernet, SSD, or any connection speed you enter.
About File Transfer Time Calculator
This file transfer time calculator estimates how long it takes to copy, download, or upload a file at a given connection speed. Enter the file size and transfer speed (in Mbps, Gbps, MB/s, or GB/s) and the tool shows the estimated duration. Built-in presets for USB, Thunderbolt, Ethernet, WiFi, and storage interfaces fill in typical real-world speeds. All calculations run in your browser.
How It Works
| Formula | Example |
|---|---|
| Transfer Time = File Size (bits) / Speed (bits per second) | 10 GB file at 1 Gbps = 80 seconds (10 x 8 / 1 Gbps) |
Remember: file sizes are in bytes, speeds are usually in bits. 1 byte = 8 bits. A 100 Mbps connection transfers 12.5 MB per second, not 100 MB per second.
Connection Speed Reference
| Interface | Theoretical Max | Real-World Speed | Time for 50 GB |
|---|---|---|---|
| USB 2.0 | 480 Mbps | ~35 MB/s | ~24 minutes |
| USB 3.0 (USB 3.2 Gen 1) | 5 Gbps | ~400 MB/s | ~2 minutes |
| USB 3.2 Gen 2 | 10 Gbps | ~800 MB/s | ~63 seconds |
| USB4 / Thunderbolt 3 | 40 Gbps | ~2,500 MB/s | ~20 seconds |
| Thunderbolt 4/5 | 40-120 Gbps | ~3,000 MB/s | ~17 seconds |
| Gigabit Ethernet | 1 Gbps | ~112 MB/s | ~7.5 minutes |
| 2.5G Ethernet | 2.5 Gbps | ~280 MB/s | ~3 minutes |
| 10G Ethernet | 10 Gbps | ~1,100 MB/s | ~45 seconds |
| WiFi 5 (802.11ac) | 3.5 Gbps | ~200-400 MB/s | ~2-4 minutes |
| WiFi 6 (802.11ax) | 9.6 Gbps | ~300-600 MB/s | ~1.5-2.5 minutes |
| WiFi 7 (802.11be) | 46 Gbps | ~1,000+ MB/s | ~50 seconds |
| SATA SSD | 6 Gbps | ~550 MB/s | ~91 seconds |
| NVMe SSD (PCIe 4.0) | ~64 Gbps | ~5,000 MB/s | ~10 seconds |
| NVMe SSD (PCIe 5.0) | ~128 Gbps | ~10,000 MB/s | ~5 seconds |
Why Real-World Speeds Are Lower
| Factor | Impact | Typical Overhead |
|---|---|---|
| Protocol overhead | TCP/IP headers, USB framing, error correction | 5-15% of theoretical speed |
| File system overhead | Small files have more overhead than large files per byte | Significant for thousands of small files |
| Network congestion | Shared bandwidth with other devices and users | Varies - can halve effective speed |
| WiFi interference | Distance, walls, other networks on same channel | 20-60% speed reduction typical |
| Disk write speed | Destination drive may be slower than the connection | HDD bottleneck at ~100-200 MB/s |
A good rule of thumb: expect 60-80% of theoretical maximum speed in practice.
Common File Size Reference
| File Type | Typical Size |
|---|---|
| Smartphone photo (JPEG) | 3-8 MB |
| RAW photo | 25-60 MB |
| MP3 song (4 minutes) | 4-8 MB |
| FLAC song (4 minutes) | 25-40 MB |
| 1080p movie (2 hours) | 4-8 GB |
| 4K movie (2 hours) | 15-30 GB |
| AAA game install | 50-150 GB |
| Full system backup | 200-500 GB |
To estimate file sizes from bitrate and duration, the bitrate calculator handles audio and video. For converting between storage units, the storage converter handles bytes, KB, MB, GB, and TB. All calculations run in your browser.
Frequently Asked Questions
Why is my actual transfer slower than the estimate?
Theoretical speeds assume ideal conditions. In practice, protocol overhead, disk seek times, small file penalties, CPU bottlenecks, and shared bandwidth all reduce throughput. Real transfers typically achieve 60-80% of the rated speed.
What is the difference between Mbps and MB/s?
Mbps (megabits per second) is used for network and interface speeds. MB/s (megabytes per second) is used for disk and file transfer rates. 1 MB/s equals 8 Mbps, because there are 8 bits in a byte.
Which preset should I use for USB transfers?
USB 2.0 tops out around 35 MB/s in practice. USB 3.0 reaches about 400 MB/s with fast drives. USB 3.2 Gen 2 doubles that. If your drive is slower than the USB standard, the drive speed is the bottleneck.
Does this account for overhead?
The calculator shows the raw transfer time based on the speed you enter. A note reminds you that real-world speeds are typically 60-80% of the theoretical maximum. For a conservative estimate, use a lower speed value.
How fast is WiFi 6 compared to Ethernet?
WiFi 6 averages around 1.2 Gbps in good conditions, while standard Gigabit Ethernet provides a steady 1 Gbps. WiFi speeds vary with distance and interference, so Ethernet is more consistent for large transfers.
Link to this tool
Copy this HTML to link to this tool from your website or blog.
<a href="https://toolboxkit.io/tools/file-transfer-calculator/" title="File Transfer Time Calculator - Free Online Tool">Try File Transfer Time Calculator on ToolboxKit.io</a>