Mbps vs MB/s: what your internet speed really means

Two units separated by a single capital letter measure two different things, and mixing them up is a common mistake when you shop for internet service, Engadget reports. Megabits per second (Mbps) and megabytes per second (MB/s) both describe data transfers. They are not interchangeable.

Bits are for speed, bytes are for files

Bits are computing's basic unit of information, the 1s and 0s that encode everything else. Bits per second measure how fast data moves, which is why streaming quality and download speeds get quoted in Mbps.

Bytes are groups of eight bits, roughly what it takes to store one letter, symbol or number. They describe file sizes and storage space, so a movie file gets measured in bytes and the rate at which it travels gets measured in bytes per second.

Both units are too small to be useful on their own at modern speeds, so each gets the prefix "mega", meaning one million units. Mbps and MB/s describe how quickly a million bits and a million bytes move.

What the numbers on your broadband bill mean

Home internet is sold in Mbps, and downloads usually outpace uploads by a wide margin. Engadget reports the FCC lists 100 Mbps as its broadband threshold while asking only 20 Mbps for uploads.

Ookla's speed tests put the median American household at 307 Mbps down and 63 Mbps up in August 2026, Engadget reports. A decade ago those figures would have looked strange: the FCC's 2015 benchmarks for high-speed internet were four times slower than the standards it uses now.

Where MB/s shows up

Megabytes per second is the unit for large transfers to and from a storage device. It describes how fast a file uploads to the cloud, or how quickly it moves off a hard disk. It is also the number that tells you how long a video download or a document transfer will take.

The conversion is one division

Divide megabits by eight. A connection rated at 100 Mbps moves 12.5 MB/s. To go the other way, multiply megabytes by eight.

Divide megabits by eight and the two units line up.

That single step explains why a 100 Mbps plan can look slow next to a 12.5 MB/s download. They are the same speed.

Do this today

The next time a download estimate looks wrong, divide the Mbps figure by eight before you blame your provider. A plan advertised at 100 Mbps should move roughly 12.5 MB/s at the file level, and the unit a speed test reports is the unit it measured in.

• FCC
• internet speed
• Mbps
• MB/s
• Ookla