In this article
Understanding Data Sizes
Digital data is measured in bytes, where one byte equals 8 bits — the smallest addressable unit of memory. As files and storage grow larger, we use prefixed units like kilobytes, megabytes, and gigabytes to express sizes in a human-readable format.
There are two competing standards for these prefixes: decimal (SI) where 1 KB = 1,000 bytes, and binary (IEC) where 1 KiB = 1,024 bytes. The difference grows significantly at larger scales — 1 TB is about 7% smaller than 1 TiB. Understanding which standard is in use matters when planning storage or calculating transfer times.
How Our Converter Works
CheckTown's Byte Converter instantly converts between all common data size units in both decimal and binary systems. Just enter a value and see all conversions update in real time.
- Enter a value in any unit — bytes, KB, MB, GB, TB, or PB — and see all other units update instantly
- Toggle between decimal (SI: KB, MB, GB) and binary (IEC: KiB, MiB, GiB) standards with one click
- Results are formatted with appropriate precision — no unnecessary trailing zeros or confusing scientific notation
Try it free — no signup required
Convert Bytes →When To Use a Byte Converter
Byte conversion comes up constantly in development, system administration, and everyday computing. Here are the most common situations where a converter saves time.
- Cloud storage planning — convert between GB and TB to estimate costs and capacity across providers
- API and upload limits — check whether a file fits within a 10 MB upload limit or a 100 KB payload threshold
- Network bandwidth — convert between Mbps and MB/s to understand actual download speeds versus advertised rates
Frequently Asked Questions
What is the difference between MB and MiB?
MB (megabyte) uses the decimal standard where 1 MB = 1,000,000 bytes (10^6). MiB (mebibyte) uses the binary standard where 1 MiB = 1,048,576 bytes (2^20). Operating systems often display sizes in binary but label them with decimal prefixes, which is why a 256 GB drive shows as ~238 GB in your file manager.
Why does my hard drive show less space than advertised?
Drive manufacturers use decimal units (1 GB = 1,000,000,000 bytes), but most operating systems display sizes in binary units while labeling them as GB. This discrepancy means a 1 TB drive shows as approximately 931 GB. The storage is not missing — it is a labeling difference.
Is a kilobyte 1,000 or 1,024 bytes?
It depends on context. The SI (decimal) standard defines 1 KB = 1,000 bytes. The IEC (binary) standard defines 1 KiB = 1,024 bytes. Most file systems and programming contexts use binary, while storage manufacturers and network speeds use decimal. Our converter supports both.