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Mbps to Gbps Converter

Convert Mbps to Gbps by dividing by 1,000: 100 Mbps = 0.1 Gbps, 500 Mbps = 0.5 Gbps, and 1,000 Mbps = 1 Gbps. Edit either field to convert in both directions and see the theoretical MB/s equivalent.

By Mbps to Bytes Editorial Team Last reviewed July 29, 2026

Decimals:

Megabits per second (Mbps)

Mbps

Divide Mbps by 1,000 to get Gbps.

Gigabits per second (Gbps)

Gbps

Multiply Gbps by 1,000 to get Mbps.

Try Mbps:

How to Convert Mbps to Gbps

Divide Mbps by 1,000 to convert it to Gbps. For example, 300 Mbps ÷ 1,000 = 0.3 Gbps, 500 Mbps = 0.5 Gbps, and 1,000 Mbps = 1 Gbps.

Gbps = Mbps ÷ 1,000

Mbps → Gbps example

2,500 Mbps ÷ 1,000 = 2.5 Gbps.

Gbps → Mbps example

2.5 Gbps × 1,000 = 2,500 Mbps.

Mbps means megabits per second; Gbps means gigabits per second. Both are decimal bit-rate units used for bandwidth, internet speeds, Ethernet links, router ports, and data-transfer rates. They measure the same quantity at different scales.

In broadband and networking shorthand, “gig” normally means 1 Gbps. Therefore, an “Mbps to gig” conversion uses the same rule: divide Mbps by 1,000.

The factor is exactly 1,000—not 1,024. NIST defines mega as 10⁶ and giga as 10⁹, and explicitly says SI prefixes must not represent powers of two. Binary prefixes such as mebi and gibi are separate. See our conversion methodology for the factors used across the site.

Popular Mbps to Gbps Conversions

Exact decimal conversions with the corresponding theoretical megabytes-per-second rate.

25 Mbps = 0.025 Gbps

Theoretical byte rate: 3.125 MB/s

50 Mbps = 0.05 Gbps

Theoretical byte rate: 6.25 MB/s

100 Mbps = 0.1 Gbps

Theoretical byte rate: 12.5 MB/s

300 Mbps = 0.3 Gbps

Theoretical byte rate: 37.5 MB/s

500 Mbps = 0.5 Gbps

Theoretical byte rate: 62.5 MB/s

750 Mbps = 0.75 Gbps

Theoretical byte rate: 93.75 MB/s

1,000 Mbps = 1 Gbps

Theoretical byte rate: 125 MB/s

2,500 Mbps = 2.5 Gbps

Theoretical byte rate: 312.5 MB/s

Popular Gbps to Mbps Conversions

Multiply Gbps by 1,000; divide the resulting Mbps by eight for theoretical MB/s.

1 Gbps = 1,000 Mbps

Theoretical byte rate: 125 MB/s

1.2 Gbps = 1,200 Mbps

Theoretical byte rate: 150 MB/s

2 Gbps = 2,000 Mbps

Theoretical byte rate: 250 MB/s

2.5 Gbps = 2,500 Mbps

Theoretical byte rate: 312.5 MB/s

3 Gbps = 3,000 Mbps

Theoretical byte rate: 375 MB/s

5 Gbps = 5,000 Mbps

Theoretical byte rate: 625 MB/s

8 Gbps = 8,000 Mbps

Theoretical byte rate: 1,000 MB/s

10 Gbps = 10,000 Mbps

Theoretical byte rate: 1,250 MB/s

Mbps to Gbps and Gbps to Mbps Tables

Exact SI decimal rates

Gbps to Mbps

Gbps	Mbps	MB/s
0.5 Gbps	500 Mbps	62.5 MB/s
1 Gbps	1,000 Mbps	125 MB/s
1.5 Gbps	1,500 Mbps	187.5 MB/s
2 Gbps	2,000 Mbps	250 MB/s
2.5 Gbps	2,500 Mbps	312.5 MB/s
5 Gbps	5,000 Mbps	625 MB/s
10 Gbps	10,000 Mbps	1,250 MB/s
40 Gbps	40,000 Mbps	5,000 MB/s
100 Gbps	100,000 Mbps	12,500 MB/s

Mbps to Gbps

Mbps	Gbps	Theoretical MB/s
100 Mbps	0.1 Gbps	12.5 MB/s
500 Mbps	0.5 Gbps	62.5 MB/s
940 Mbps	0.94 Gbps	117.5 MB/s
1,000 Mbps	1 Gbps	125 MB/s
1,200 Mbps	1.2 Gbps	150 MB/s
2,000 Mbps	2 Gbps	250 MB/s
3,000 Mbps	3 Gbps	375 MB/s
5,000 Mbps	5 Gbps	625 MB/s
10,000 Mbps	10 Gbps	1,250 MB/s

Mbps vs Gbps: What Is the Difference?

Mbps and Gbps both measure bit rate—how many bits can move each second. Gbps is the larger label: one gigabit per second equals 1,000 megabits per second. Changing the unit does not make a connection faster; it only rewrites the same rate at a different decimal scale.

Difference between Mbps, Gbps, MB per second, and GB
Unit	Meaning	Exact relationship	Common use
Mbps	Megabits per second	1,000,000 bits/s	Internet plans and speed tests
Gbps	Gigabits per second	1,000 Mbps	Gigabit and multi-gig links
MB/s	Megabytes per second	Mbps ÷ 8	File-transfer readouts
GB	Gigabytes of data	Amount, not a rate	File size and data usage

Capitalization matters: Gbps uses a lowercase b for bits, while GB/s uses an uppercase B for bytes. Because one byte contains eight bits, 1 Gbps is theoretically 125 MB/s—not 1 GB/s. Converting a rate such as Mbps into an amount such as GB also requires a time period; use the download and data-transfer calculator for that question.

Why Can a 1 Gbps Speed Test Show About 940 Mbps?

The unit conversion remains exact: 1 Gbps always equals 1,000 Mbps. A speed test measures delivered application throughput, not merely the nominal link rate. Ethernet framing, IP and transport headers, acknowledgements, test traffic, device processing, and the remote server all use part of the available capacity. That is why a wired result around 930–950 Mbps can be normal on a 1 Gbps path.

Nominal line rate: 1,000 Mbpsexact conversion

Illustrative test: 940 Mbps94% example

The lower row is a planning illustration, not a guaranteed result or a second definition of Gbps.

There is no universal “real-world percentage.” MTU, IPv4 versus IPv6, TCP versus UDP, packet size, test method, offloads, Wi-Fi, router capability, and endpoint performance can change the result. Cisco distinguishes bit rate, packet rate, throughput, and stateful-device limits; our PPS calculator shows how Ethernet frame size changes packet rate. For plan-buying context, see the separate gigabit internet guide.

Port Speed and Hardware Bottlenecks

Converting Mbps and Gbps is exact; delivering the line rate depends on the complete path. The router WAN and LAN ports, switch, network adapter, cable or optical module, device, and remote endpoint must all sustain the required rate. The slowest negotiated link is the ceiling.

Common Ethernet line rates expressed in Gbps and Mbps
Ethernet link class	Gbps	Equivalent Mbps	Planning implication
Fast Ethernet	0.1 Gbps	100 Mbps	A 100 Mbps port caps a faster path
Gigabit Ethernet	1 Gbps	1,000 Mbps	Required for a gigabit-class wired link
2.5 Gigabit Ethernet	2.5 Gbps	2,500 Mbps	Every wired hop must negotiate above 1 Gbps
5 Gigabit Ethernet	5 Gbps	5,000 Mbps	Requires matching multi-gig interfaces
10 Gigabit Ethernet	10 Gbps	10,000 Mbps	Storage and endpoint limits become important

These are nominal Ethernet line rates and exact unit equivalents, not guaranteed application throughput. Verify the negotiated link rate and test over a wired connection before diagnosing an internet-plan shortfall.

Primary References

NIST Guide to the SI — SI prefixes defines mega as 10⁶, giga as 10⁹, and rejects using SI prefixes for powers of two.
IEEE 802.3 editorial guidance documents Mbps and Gbps as accepted bit-per-second notation for Ethernet work.
Cisco — network performance metrics distinguishes bandwidth, packet rate, throughput, connections, and other practical capacity limits.

All conversions on this page are calculated from the stated decimal factors. Last reviewed July 29, 2026. See an error? Use the contact page; our editorial standards explain the correction process.

Frequently Asked Questions

Quick answers about Gbps and Mbps

How do I convert Mbps to Gbps?

Divide the Mbps value by 1,000. The formula is Gbps = Mbps ÷ 1,000, so 100 Mbps = 0.1 Gbps, 500 Mbps = 0.5 Gbps, and 1,000 Mbps = 1 Gbps.

How many Gbps is 100 Mbps?

100 Mbps = 0.1 Gbps. Divide 100 by 1,000 to convert megabits per second to gigabits per second.

How many Gbps is 500 Mbps?

500 Mbps = 0.5 Gbps. It is exactly half of a 1 Gbps line rate and has a theoretical byte rate of 62.5 MB/s.

Is 1,000 Mbps the same as 1 Gbps?

Yes. 1,000 Mbps and 1 Gbps are the same decimal data rate: one billion bits per second. The theoretical byte rate is 125 MB/s before protocol and system overhead.

Is 1 Gbps equal to 1,000 or 1,024 Mbps?

Exactly 1,000 Mbps. Mega and giga are decimal SI prefixes: mega is 10^6 and giga is 10^9. The factor 1,024 belongs to binary prefixes such as mebi and gibi, not to Mbps and Gbps.

How many Mbps is 2.5 Gbps?

2.5 Gbps = 2,500 Mbps. Multiply the Gbps value by 1,000. Its theoretical byte rate is 312.5 MB/s.

What is the difference between Mbps and Gbps?

Both measure bit rate. Mbps means megabits per second and Gbps means gigabits per second. One Gbps is 1,000 times one Mbps; the units differ only in decimal scale, not in what they measure.

Why does my gigabit plan speed test at ~940 Mbps?

A result around 930–950 Mbps can be normal on a 1 Gbps wired link because speed tests report application throughput after Ethernet, IP, TCP or UDP, and test-system overhead. It is not a conversion constant: MTU, protocol, hardware, server capacity, and test method can change the result.

How fast is 1 Gbps in MB/s?

The theoretical byte rate is 125 MB/s because one byte contains eight bits: 1,000 Mbps ÷ 8 = 125 MB/s. A real file transfer can be lower because of protocol, storage, server, and device limits.

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