Network Speed Converter
Convert between network speed and data transfer units instantly. Calculate download times and compare internet speeds — all in your browser.
Enter a file size and connection speed to calculate how long the download will take.
Enter a file size to see download times at common connection speeds.
| Connection | Speed | Download Time |
|---|
| Connection Type | Speed | MB/s | Typical Use |
|---|---|---|---|
| Dial-up | 56 Kbps | 0.007 | Basic email, text-only web pages |
| Early DSL | 1 Mbps | 0.125 | Web browsing, email with attachments |
| Basic DSL/Cable | 5 Mbps | 0.625 | SD video streaming, casual browsing |
| Standard Broadband | 25 Mbps | 3.125 | HD streaming, video calls, light gaming |
| Fast Broadband | 100 Mbps | 12.5 | 4K streaming, multiplayer gaming, working from home |
| Gigabit Cable | 500 Mbps | 62.5 | Multiple 4K streams, large file transfers, smart homes |
| Gigabit Fiber | 1 Gbps | 125 | Near-instant downloads, heavy cloud computing |
| Multi-Gig Fiber | 2.5 Gbps | 312.5 | Prosumer NAS, 8K streaming, high-speed backups |
| 5G mmWave (peak) | 5 Gbps | 625 | Ultra-low latency applications, edge computing |
| 10G Fiber | 10 Gbps | 1,250 | Data centers, enterprise backbone, research networks |
Understanding Network Speed Units
Network speeds are measured in bits per second, while file sizes are measured in bytes. This fundamental difference causes confusion — your ISP advertises speeds in megabits per second (Mbps), but your download manager shows megabytes per second (MB/s). Since there are 8 bits in a byte, you divide the Mbps number by 8 to get MB/s. A 100 Mbps connection delivers a maximum of 12.5 MB/s.
Bits vs Bytes: The Key Difference
| Unit (bits) | Value | Equivalent (bytes) |
|---|---|---|
| 1 bps | 1 bit/s | 0.125 B/s |
| 1 Kbps | 1,000 bits/s | 125 B/s |
| 1 Mbps | 1,000,000 bits/s | 125 KB/s |
| 1 Gbps | 1,000,000,000 bits/s | 125 MB/s |
| 1 Tbps | 1,000,000,000,000 bits/s | 125 GB/s |
Network speeds use SI (decimal) prefixes: 1 Kbps = 1,000 bps, 1 Mbps = 1,000 Kbps. This is different from file sizes where some systems use binary prefixes (1 KiB = 1,024 bytes). This converter uses SI/decimal prefixes throughout for consistency with how ISPs and networking standards report speeds.
How to Calculate Download Time
To calculate download time: convert your file size to bits (multiply bytes by 8), then divide by your connection speed in bits per second. For example, downloading a 1 GB file (8,000,000,000 bits) at 100 Mbps (100,000,000 bits/s) takes 80 seconds — about 1 minute and 20 seconds. Real-world speeds are typically 60-80% of the advertised rate due to protocol overhead, Wi-Fi loss, and server-side limits.
Frequently Asked Questions
What is the difference between Mbps and MB/s?
Mbps (megabits per second) measures network speed in bits, while MB/s (megabytes per second) measures data transfer in bytes. Since 1 byte equals 8 bits, you divide Mbps by 8 to get MB/s. For example, a 100 Mbps connection transfers data at 12.5 MB/s.
How long does it take to download a 1 GB file?
Download time depends on your connection speed. At 10 Mbps it takes about 13 minutes and 20 seconds, at 100 Mbps about 1 minute and 20 seconds, at 1 Gbps about 8 seconds, and at 10 Gbps under 1 second. Real-world speeds may vary due to network overhead and congestion.
Why is my download speed slower than my internet plan?
ISPs advertise speeds in megabits per second (Mbps), but browsers and download managers show megabytes per second (MB/s). A 100 Mbps plan downloads at about 12.5 MB/s maximum. Additionally, network overhead, Wi-Fi interference, server limits, and congestion can reduce actual throughput below the advertised rate.
What internet speed do I need for streaming 4K video?
Streaming 4K video typically requires at least 25 Mbps for a single stream. Netflix recommends 15 Mbps minimum for 4K, while YouTube suggests 20 Mbps. If multiple devices are streaming simultaneously, you should multiply accordingly — a household with 3 simultaneous 4K streams needs at least 75 Mbps.
Is my data safe when using this converter?
Yes. All calculations happen entirely in your browser using JavaScript. No data is sent to any server. Your inputs never leave your device.
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