MB and MiB count bytes differently
In this tool, KB, MB and GB use powers of 1,000; KiB, MiB and GiB use powers of 1,024. The same quantity of bytes therefore has different numerical values in the two systems. Check a product's or application's definition instead of assuming its label uses one system.
Worked examples
Formula / Calculation Method
1 KB = 1,000 B; 1 MB = 1,000,000 B.
1 KiB = 1,024 B; 1 MiB = 1,048,576 B.
How to Use This Tool
- Enter a number using a period for decimals, for example 2.5.
- Choose the From and To units. The result and reference table update as you type.
- Use Swap to reverse the units while keeping your entered value, or Copy Result to save the conversion.
Common Use Cases
What this result includes
This is a size converter, so no file is uploaded and no compression is performed. A converted file has the same number of bits. A real file has a whole number of bytes, even when a conversion shows a fractional number of larger units.
Results have up to 12 significant digits. Very large values are numerical estimates rather than an exact byte counter because the calculator uses JavaScript numbers. Transfer time also depends on the connection rate, overhead, and contention; converting file size alone cannot predict an actual download duration.