Data Storage (Byte) Converter

Decimal vs binary units

Storage is measured two ways: decimal units (1 KB = 1000 bytes) used by drive manufacturers, and binary units (1 KiB = 1024 bytes) used by most operating systems. This converter includes both so you can see exactly why a '1 TB' drive shows as roughly 931 GiB.

It covers bits and bytes through petabytes (PB) and tebibytes (TiB), making it useful for developers, sysadmins and anyone sizing files or storage.

Common storage conversions

• Bytes to megabytes and megabytes to gigabytes
• GB to TB for drive capacity
• MB to MiB to understand reported sizes

Key features at a glance

• Decimal (SI) units: KB, MB, GB, TB, PB
• Binary (IEC) units: KiB, MiB, GiB, TiB
• Bits and bytes, with the 8-bits-per-byte relationship
• Live table that makes the KB vs KiB difference obvious
• Handles file sizes and drive capacities
• Runs entirely in your browser, even offline

Decimal versus binary units explained

Digital storage is measured two different ways, and the clash between them causes endless confusion. Decimal (SI) units treat a kilobyte as 1,000 bytes, a megabyte as a million, and so on in powers of ten — the convention used by drive and device manufacturers. Binary (IEC) units treat a kibibyte (KiB) as 1,024 bytes, a mebibyte (MiB) as 1,024², and so on in powers of two, matching how computer memory is actually addressed.

The gap widens at every step. A kilobyte and a kibibyte differ by just 2.4%, but a terabyte and a tebibyte differ by about 10%. This is exactly why a drive sold as '1 TB' (a trillion bytes) shows up in your operating system as roughly 931 GiB — the hardware uses decimal units while the OS reports binary ones. The converter includes both systems side by side so this discrepancy stops being a mystery.

Bits versus bytes

A bit is the smallest unit of digital information, a single 0 or 1, while a byte is a group of eight bits. This eight-to-one relationship is the source of another common mix-up, especially around data speeds. Network and internet connection speeds are quoted in bits per second (megabits, Mbps), whereas file sizes and download managers report bytes (megabytes, MB).

Because there are eight bits in a byte, a 100 Mbps connection delivers a maximum of about 12.5 megabytes per second, not 100. This factor-of-eight difference explains why downloads seem slower than the advertised connection speed suggests. The converter handles bits and bytes explicitly, so you can translate between a speed quoted in bits and a file size measured in bytes without confusion.

Sizing files and storage in practice

Understanding these units has real consequences when you buy storage or manage files. Knowing that a '500 GB' drive provides about 465 GiB of usable space as reported by your computer sets correct expectations and avoids the feeling of being short-changed. Estimating how many photos, songs, or videos fit on a device relies on converting between the file sizes and the drive's stated capacity.

Developers and system administrators convert constantly when calculating bandwidth, database sizes, backup volumes, and memory allocation. Because the converter spans from bits all the way to petabytes and pebibytes, and clearly separates decimal from binary, it serves both the casual user checking if a file will fit and the professional sizing infrastructure precisely.

Tips for converting data storage

• Manufacturers use decimal units (1 TB = 10^12 bytes); operating systems use binary
• A '1 TB' drive shows as about 931 GiB because of this difference
• Remember 8 bits make 1 byte — important for download speeds
• Network speeds are in bits (Mbps); file sizes are in bytes (MB)
• Use KiB, MiB, and GiB when you need the binary, memory-accurate figure

Why choose our data storage converter?

Our converter is completely free with no signup, no limits, and no subscription. It runs entirely in your browser, so conversions are instant, it works offline, and the values you enter never leave your device.

It is one of more than 200 free tools on ToopTools, and you can pin it to your My Workspace, a personalized workspace where you keep the tools you use most in a single dashboard. Beside the other converters and developer tools, it makes sizing files and storage clear and quick.

Common use cases

People use the data storage converter to understand why a new drive shows less capacity than advertised, to estimate how many files fit on a device, and to translate between the bits of a connection speed and the bytes of a download. It demystifies the numbers behind everyday storage.

Developers and system administrators use it for bandwidth planning, database and backup sizing, and memory calculations, where the decimal-versus-binary distinction directly affects the figures. Because it shows both unit systems and spans bits to petabytes, it covers both casual and professional needs.

Is the data storage converter free?

Yes. It is completely free with no account, no sign-up, and no usage limits. Convert as many sizes as you like at no cost.

Why does my 1 TB drive show as 931 GB?

The manufacturer counts 1 TB as a trillion bytes (decimal), but your operating system measures in binary units, where that same number of bytes is about 931 GiB. No space is missing; it is just two different ways of counting.

What is the difference between KB and KiB?

A kilobyte (KB) is 1,000 bytes in the decimal system, while a kibibyte (KiB) is 1,024 bytes in the binary system. The gap is small for kilobytes but grows to about 10% at the terabyte level.

How many bits are in a byte?

There are 8 bits in a byte. This matters for speeds: a 100 Mbps (megabits per second) connection transfers at most about 12.5 MB (megabytes) per second, since you divide by eight.

Why are download speeds in bits but file sizes in bytes?

By convention, data transfer rates are quoted in bits per second while stored files are measured in bytes. Because a byte is eight bits, an advertised connection speed delivers roughly one-eighth as many bytes per second.

Are my conversions kept private?

Yes. Everything is computed in your browser and nothing is uploaded, so the values you enter stay private and the tool works without an internet connection.

How do I convert megabytes to gigabytes?

Enter a value in megabytes and pick gigabytes as the target, and the converter shows the result instantly. It supports bits and bytes from kilobytes up to terabytes, in both decimal (KB) and binary (KiB) systems, so you get the right figure for any context.

Does the data storage converter work offline?

Yes. The conversion runs entirely in your browser, so once the page has loaded the tool works without an internet connection, and nothing you enter is uploaded — it stays private on your own device.