How it works
1 Gbps = 1,000 Mbps; 1 MB/s = 8 Mbps. Transfer time = file size in bytes ÷ (speed in bytes per second × efficiency ÷ 100).
- Enter your data-transfer speed.
- Choose source and destination units.
- Compare Mbps, Gbps and MB/s.
- Add file size and efficiency for transfer time.
Worked example: 100 Mbps = 0.1 Gbps = 12.5 MB/s. A 5 GB file takes an ideal 400 seconds, or 6 min 40 s. At 80% efficiency it takes 500 seconds, or 8 min 20 s.
Common network speeds
| Mbps | Converted value | MB/s |
|---|---|---|
| 10 | 0.01 Gbps | 1.25 MB/s |
| 25 | 0.025 Gbps | 3.125 MB/s |
| 50 | 0.05 Gbps | 6.25 MB/s |
| 100 | 0.1 Gbps | 12.5 MB/s |
| 250 | 0.25 Gbps | 31.25 MB/s |
| 500 | 0.5 Gbps | 62.5 MB/s |
| 1000 | 1 Gbps | 125 MB/s |
| 2500 | 2.5 Gbps | 312.5 MB/s |
| 10000 | 10 Gbps | 1,250 MB/s |
Swipe the table sideways to see the rest.
Things to consider
- Check bits versus bytes in the speed label.
- Network bit rates use decimal units.
- MiB/s and GiB/s use binary byte units.
- Use sustained speed, not a brief peak.
- Lower efficiency for a more cautious estimate.
Frequently asked questions
How many Mbps are in a Gbps?
One Gbps is exactly 1,000 Mbps. Divide Mbps by 1,000 to get Gbps, or multiply Gbps by 1,000 to get Mbps. Network bit-rate prefixes use decimal factors.
What is the difference between Mbps and MBps?
Mbps means megabits per second. MBps, also written MB/s, means megabytes per second. One byte contains 8 bits, so multiply MB/s by 8 to get Mbps. MiB/s uses 1,048,576 bytes per second instead of 1,000,000.
Why does a 100 Mbps plan download at about 12.5 MB/s?
100 megabits divided by 8 equals 12.5 megabytes per second. That is an ideal ceiling at the advertised speed. Protocol overhead, Wi-Fi, congestion and server limits can reduce actual throughput.
How long does a download take?
Divide file size in bytes by speed in bytes per second. At 100 Mbps, a decimal 5 GB file takes 400 seconds, or 6 min 40 s, at 100% efficiency. At 80%, it takes 500 seconds. Use the MB to GB Converter to compare file-size units.
Are upload and download speeds the same?
Not necessarily. Download is data received; upload is data sent. Some connections have different limits in each direction. Enter the relevant sustained speed for your transfer.
Is 1 Gbps fast?
It is an ideal 125 MB/s. Whether that is useful depends on file sizes, simultaneous users and activities. Devices, local connections and remote servers can limit the speed you actually use; a higher rate does not guarantee lower latency.
Results are estimates for general information only, not financial, medical or professional advice.