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Bit, Byte, KB, MB, GB, TB
Whether you're trying to figure out how many songs fit on your phone, comparing cloud storage plans, or working through a networking assignment, understanding data sizes is essential in today's digital world. Our free Data Size Converter makes it effortless to convert between bits, bytes, kilobytes, megabytes, gigabytes, terabytes, and beyond — instantly and accurately.
Data measurement units can be genuinely confusing. Hard drive manufacturers measure storage in decimal gigabytes, while your operating system reports it in binary gibibytes. Internet speeds are quoted in megabits per second, while file sizes show up in megabytes. Without a reliable converter, it's easy to make costly mistakes — whether you're purchasing storage, estimating download times, or planning a data backup strategy.
Our converter handles all the common units you'll encounter, giving you instant, accurate results without any manual math.
Everything in computing starts with the bit — a single binary value of 0 or 1. Eight bits make one byte, and from there the units scale up rapidly. Here's a quick breakdown of the most commonly used data size units:
There are actually two systems for measuring data sizes, which is the source of a lot of confusion. The decimal (SI) system counts in powers of 10 — so 1 KB equals exactly 1,000 bytes. The binary (IEC) system counts in powers of 2 — so 1 kibibyte (KiB) equals 1,024 bytes.
Operating systems like Windows historically used binary measurement but labeled it with decimal names (showing your 500 GB drive as about 465 GB). Our converter clearly distinguishes between these systems so you always know exactly what you're working with.
Putting data sizes into context makes them far easier to understand. Here are some practical reference points:
Our tool is useful for a surprisingly wide range of people and situations:
Using our converter couldn't be simpler. Just enter a value in any field, select your starting unit, and the tool instantly displays the equivalent values across all other units. There's no submit button to click and no page to reload — the conversion happens in real time as you type. It works perfectly on desktop, tablet, and mobile devices.
In the decimal system used by storage manufacturers, 1 gigabyte equals 1,000,000,000 bytes (one billion bytes). In the binary system used by most operating systems, 1 gibibyte (GiB) equals 1,073,741,824 bytes. This difference is why a 1 TB hard drive often shows up as about 931 GB in Windows or macOS.
A megabit (Mb) is one million bits, while a megabyte (MB) is one million bytes — and since there are 8 bits in a byte, one megabyte equals 8 megabits. This distinction matters most when talking about internet speed. An internet plan offering 100 Mbps (megabits per second) can transfer about 12.5 MB per second, not 100 MB per second.
Storage manufacturers use the decimal system (1 GB = 1,000,000,000 bytes), but operating systems like Windows traditionally display storage using binary calculations (1 GB = 1,073,741,824 bytes). This makes a 500 GB drive appear as roughly 465 GB on your computer — the storage isn't missing, it's just measured differently.
The standard progression after a terabyte is: Petabyte (PB) → Exabyte (EB) → Zettabyte (ZB) → Yottabyte (YB). Each step is 1,000 times larger than the previous. While petabytes are used in enterprise computing today, exabytes describe the total amount of data created globally each year.
Yes, completely. Our Data Size Converter is 100% free with no sign-up, no subscription, and no hidden charges. Use it as many times as you need, from any device, at any time.