How many MB/s is 1 Gbps?

1 Gbps equals 125 MB/s. The calculation: 1 Gbps = 1,000 Mbps = 1,000,000,000 bits per second. Divide by 8 to convert bits to bytes = 125,000,000 bytes per second = 125 MB/s.

Why do I divide by 8?

Network speeds are measured in bits, while file sizes are measured in bytes. There are 8 bits in 1 byte, so you divide the bit rate by 8 to get the byte rate.

Does this use SI (decimal) or binary prefixes?

This converter uses SI decimal prefixes: 1 GB = 1,000 MB = 1,000,000,000 bytes, and 1 Gbps = 1,000,000,000 bits per second. Most ISPs and networking equipment use SI decimal. Hard drive manufacturers also use SI decimal, while operating systems sometimes report in binary (GiB, MiB).

My internet is 1 Gbps but files only download at 100–120 MB/s. Why?

A 1 Gbps connection has a theoretical ceiling of 125 MB/s, but real throughput is lower due to protocol overhead (TCP/IP headers), network congestion, server-side limits, storage speed, and Wi-Fi overhead. 100–120 MB/s on a 1 Gbps plan is normal.

What is the difference between Gbps and GBps?

Gbps (lowercase b) is gigabits per second; GBps (uppercase B) is gigabytes per second. 1 GBps = 8 Gbps because 1 byte = 8 bits. This tool converts Gbps to MB/s (not GBps).

How do I convert MB/s back to Gbps?

Divide MB/s by 125. For example, 250 MB/s ÷ 125 = 2 Gbps. This tool supports bidirectional conversion — just enter a value in the MB/s field.

Gbps to MB/s Converter

Name: Gbps to MB/s Converter
Availability: InStock
Author: Nham Vu

Convert gigabits per second to megabytes per second instantly — 1 Gbps = 125 MB/s.

Gigabits per second (Gbps)

Network / link speed in Gbps

Megabytes per second (MB/s)

File transfer / throughput in MB/s

MB/s = Gbps × 125 | Gbps = MB/s ÷ 125

Common Gbps to MB/s conversions

Gbps	MB/s	Common use
0.1	12.5	100 Mbps Ethernet
0.5	62.5	500 Mbps fiber plan
1	125	1 Gbps Ethernet / fiber
2.5	312.5	2.5 Gbps NBase-T
10	1,250	10 Gbps data center uplink
25	3,125	25 Gbps server NIC
100	12,500	100 Gbps backbone link

Summary

Convert gigabits per second to megabytes per second instantly — 1 Gbps = 125 MB/s.

How it works

Enter a Gbps value in the top input field.
The converter multiplies by 125 (divides by 8, then multiplies by 1,000) to produce MB/s.
The result updates instantly as you type.
Enter a MB/s value in the bottom field to reverse the conversion.
Use the swap button to flip both fields, or copy either result with one click.

Use cases

Find out how fast files actually download on a 1 Gbps fiber connection.
Compare NVMe drive throughput (in GB/s or MB/s) with network link speeds (in Gbps).
Translate data center uplink rates for capacity planning documents.
Verify that a 10 Gbps switch port can sustain the expected 1,250 MB/s throughput.
Convert cloud storage bandwidth quotas quoted in Gbps into MB/s for practical use.
Cross-check ISP speed test results shown in Mbps against file transfer benchmarks in MB/s.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu