Mbps to Gbps Converter

The conversion is one division: Gbps = Mbps / 1,000

Both units count bits per second. The only difference is the prefix: mega means one million and giga means one billion, so one gigabit is a thousand megabits and the arithmetic is a division by 1,000.

Gbps = Mbps / 1,000

Going the other way, multiply: Mbps = Gbps x 1,000. Because the step is a round thousand, you can move the decimal point three places instead of reaching for a calculator. 300 Mbps is 0.3 Gbps, 2,500 Mbps is 2.5 Gbps, 750 Mbps is 0.75 Gbps, and 0.05 Gbps is 50 Mbps. A speed written as 0.94 Gbps is the same line the speed test calls 940 Mbps.

Each prefix is a factor of 1,000 in the International System of Units, and network speeds follow that decimal ladder rather than the binary one storage uses. The data-rate units table lists the full set, from bits per second up to petabits, and every rung converts the same way.

One warning before the examples: the result is a rate, not a file size. Gbps answers "how fast", while GB answers "how much". Section 3 covers the division by 8 that turns one into the other.

Worked examples from 100 Mbps to 10 Gbps

Start with a 100 Mbps cable upload. Divide by 1,000 and you get 0.1 Gbps. In bytes that is 12.5 MB/s, so a 1 GB file needs 80 seconds and a 10 GB file needs about 13 minutes.

A 500 Mbps plan is 0.5 Gbps, or 62.5 MB/s. A 5 GB video upload takes 5,000 / 62.5 = 80 seconds. Double the plan to 1,000 Mbps and the same file takes 40 seconds, which is the sort of gain people notice on large uploads and rarely notice on web pages.

Then there is the gigabit plan that tests at 940 Mbps. That is 0.94 Gbps, and it is not a broken line. Ethernet framing, TCP headers and the speed test server itself eat a few percent, so a wired test on a healthy gigabit connection usually lands between 900 and 950 Mbps. The provider sells "up to 1 Gbps" and the wire delivers about 94% of it.

• 2,500 Mbps is 2.5 Gbps, or 312.5 MB/s. A 40 GB game downloads in 128 seconds, a little over two minutes.
• 10,000 Mbps is 10 Gbps, or 1,250 MB/s. A 50 GB file lands in 40 seconds, though the receiving drive has to keep up.
• 0.3 Gbps converts back to 300 Mbps, and 1.2 Gbps is 1,200 Mbps. Round numbers going up are the easy direction.

Notice how the byte figures grow by the same factor as the bit figures. Every conversion on this page is a single multiplication or division, which means a slip of one decimal place is the usual error. If a 500 Mbps plan appears to deliver 6.25 MB/s instead of 62.5 MB/s, someone divided by 80 instead of 8.

Gbps, MB/s and GB/s are three different numbers

A bit is one eighth of a byte, so a speed in bits per second becomes a speed in bytes per second after dividing by 8. One gigabit per second is 125 megabytes per second, and 125 MB/s is 0.125 GB/s. The reverse is a multiplication by 8: a drive that writes at 1 GB/s is moving 8 Gbps, which is why a USB or network link can bottleneck a fast SSD.

The lowercase b and the uppercase B carry the whole difference. Mbps, Gbps and Kbps are bits. MB/s, GB/s and KB/s are bytes. A browser download panel that shows 12 MB/s on a 100 Mbps line is reporting the same throughput as the speed test, just in different units, and no data is missing.

File sizes add a second wrinkle. A "1 GB" file in the decimal sense is 1,000 MB, which is what network math uses. Windows reports the same file as 0.93 GB because it divides by 1,024 three times. For download times, pick one convention and stay with it: this page uses 1 GB = 1,000 MB, so 1 Gbps moves 1 GB in 8 seconds.

What each speed tier delivers in a real house

The number on the bill is the ceiling on a wired connection, and the number your devices see is lower. The FCC broadband speed guide sets the current US benchmark at 100 Mbps down and 20 Mbps up, a figure the commission adopted in 2024, so a 100 Mbps line is the floor of what counts as broadband rather than a fast connection.

The stream count comes from Netflix's own speed recommendations, which put 4K at 15 Mbps per stream and HD at 5 Mbps. A 1 Gbps line could carry 66 simultaneous 4K streams in theory, though no home router forwards that many and no family watches that many.

Where the plan stops mattering is the local network. A Wi-Fi 5 phone tops out near 400 to 500 Mbps in the same room, a Wi-Fi 6 laptop often reaches 600 to 900 Mbps near the router, and a wired desktop with a gigabit port stops at 940 Mbps no matter how fast the fiber is. Upgrading to 2.5 Gbps only pays off if the router, the cable and the device port all support 2.5GbE, and most laptops sold before 2024 do not.

Where the 1,000 and 1,024 figures collide

Network speeds use decimal prefixes, so 1 Gbps is exactly 1,000 Mbps and 1 Mbps is exactly 1,000 Kbps. Storage uses the same prefixes in marketing and binary multiples in software, so the same word means two numbers. The BIPM SI Brochure defines giga as 10^9 with no ambiguity, and the binary version has its own prefixes, kibi and gibi, for the 1,024-based values.

Put the two systems together and 1 Gbps is 125 MB/s, or 119.2 MiB/s if the software reports binary megabytes. That 4.9% gap is the same one that makes a 1 TB drive show up as 931 GB in Windows, and it is why a 1 GB file can read as 0.93 GB in the same window.

Neither number is wrong. The decimal one is standard for data rates, and the binary one is a reporting habit in operating systems. When someone tells you their 1 Gbps line "only does 119 MB/s", they are reading MiB/s and the line is fine.

Wi-Fi and 5G speeds are quoted in Gbps too, and they mean something else

The same units describe radios, and the numbers look far larger because they describe the raw link rather than the throughput you feel. The Wi-Fi 7 standard, published by the IEEE in 2024, allows a single link to carry up to 46 Gbps, and a multi-gigabit radio can report 5 Gbps or 6 Gbps on its status screen. Those are link rates with the overhead of frames, acknowledgements and contention removed.

Compare that with a wired line. A 1 Gbps fiber connection is the same class of number as a good Wi-Fi 6 laptop sitting on the desk next to the router, and neither one guarantees the other. A 2.5 Gbps link on paper drops to 700 to 900 Mbps once signal strength, walls and neighbors share the channel.

Mobile networks quote Gbps for their fastest radio carriers rather than for the phone in your hand. A 5G phone on a good band sees 300 Mbps to 1 Gbps in practice, and the figure swings with tower load, so two phones on the same plan can show 80 Mbps and 900 Mbps at the same moment. Convert a quoted 1 Gbps radio figure to bytes and you get 125 MB/s, which is the same 125 MB/s any wired gigabit link gives, and the same reminder that the number on the box is a ceiling.

One last trap: radios advertise aggregate speed across all bands and streams at once. A phone with 2.4 GHz and 5 GHz radios summed together can claim 1.2 Gbps while a single device still sees a fraction of it. Multiply by 8 to compare any of these with a file size, and the units finally line up.

Reading a speed test without fooling yourself

Most speed tests report in Mbps by default and some switch to Gbps above 1,000. A result of 0.94 Gbps and a result of 940 Mbps are the same measurement, so compare tests in one unit before drawing conclusions.

Four things move the number more than the plan does:

• The link to the router. Test on Ethernet before blaming the provider. Wi-Fi adds retries, distance and interference, and a 1 Gbps plan on a weak 5 GHz signal can read 200 Mbps.
• The server and the time of day. A single test server in another state, at 8 pm, measures congestion as much as capacity. Try two or three servers.
• Single versus multi connection. One TCP stream often stops short of the line rate on long-distance servers, while a multi-connection test fills it. Both are honest, they answer different questions.
• Overhead. Expect 3% to 6% below the advertised rate on a wired gigabit test, which is the 940 Mbps figure again.

Upload speeds follow the same conversion and are the number that matters for cloud backups and video calls. Cable plans are often asymmetric, 1 Gbps down and 50 Mbps up, while fiber is usually symmetric. Check the upload row before assuming a gigabit plan will fix slow backups: 50 Mbps up is 6.25 MB/s, and a 20 GB backup takes about 53 minutes at that rate.