Digital Storage Converter
Convert a value between bits, bytes, KB, MB, GB, and TB using 1024-based storage units. Enter an amount, then select the From unit and To unit.
Bit and Byte Size Conversion Tool
Digital Storage Formula
Where:
- \(V_{\mathrm{in}}\) — the value entered in the calculator.
- \(V_{\mathrm{out}}\) — the converted value.
- \(f_{\mathrm{from}}\) and \(f_{\mathrm{to}}\) — the number of bytes in one selected source or destination unit. The factors are \(1/8\) for b, \(1\) for B, \(1024\) for KB, \(1024^2\) for MB, \(1024^3\) for GB, and \(1024^4\) for TB.
The calculator first expresses the entered amount in bytes, then divides by the byte factor of the destination unit. It uses 1024 at every step from KB through TB.
Digital Storage – Calculation Example
Example: convert the default value of 1024 KB to MB. Both units use the calculator’s 1024-based factors.
\[1024\,\mathrm{KB}\times\frac{1024\,\mathrm{B}/\mathrm{KB}}{1024^2\,\mathrm{B}/\mathrm{MB}}=1\,\mathrm{MB}\]
Result: 1024 KB converts to 1 MB.
How to use the calculator
- Enter a nonnegative number in Value to convert. Decimals are accepted, so you can convert a fraction of a unit as well as a whole number.
- Choose the unit of that number in From unit: bit (b), byte (B), Kilobyte (KB), Megabyte (MB), Gigabyte (GB), or Terabyte (TB).
- Choose the unit you want in To unit. You can select the same unit to leave the value unchanged.
- Read Converted Value. The result includes the destination unit and is rounded to six decimal places.
Understanding digital storage units
A bit is one binary digit; a byte contains eight bits. Their symbols differ only by capitalization: b means bit, while B means byte. For example, 8 b equals 1 B, and 8 MB equals 64 million-plus bits under this calculator’s 1024-based definition. Check the letter case before converting a file size or comparing figures from different sources.
The larger units in this converter increase by a factor of 1024: 1024 B equals 1 KB, 1024 KB equals 1 MB, and so on through TB. That makes the default conversion, 1024 KB to MB, equal to exactly 1 MB. Converting toward a larger unit makes the displayed number smaller; converting toward a smaller unit makes it larger. The amount of data itself does not change.
Digital quantities are often used in discussions of files, device capacity, memory, and transfers, but the context affects their meaning. Storage is a quantity, whereas a transfer speed includes a time unit, such as bits per second. This converter changes data units only: it does not calculate how long a transfer takes. If you know a file size and a connection speed, use the Download Time Estimator to estimate the time separately.
Assumptions and practical tips
KB, MB, GB, and TB have 1024-based meanings here. In formal binary-prefix notation, those sizes are called KiB, MiB, GiB, and TiB. Decimal KB, MB, GB, and TB instead use factors of 1000. The calculator does not offer a decimal mode or separate KiB-style menu options. For instance, its 1 GB equals 1,073,741,824 B, not the 1,000,000,000 B often used to label storage devices. Check which convention a product label or operating system uses before comparing its number with the result.
The result is rounded to six decimal places. A very small nonzero conversion may therefore display as zero, and a rounded result should not be treated as an exact measurement. For a smaller-unit result that is easier to inspect, change To unit to B or b. Very large values and fine decimal fractions may also be subject to ordinary floating-point precision limits.
Keep quantity and scale separate when reading technical specifications. The Metric Prefix converter can help with decimal prefixes, but its powers of 1000 are not the powers of 1024 used for KB through TB on this page. If you are working with an image, the Image DPI & Pixel calculator concerns dimensions and resolution; pixel count alone does not determine a compressed image file’s storage size.
1024-based unit reference
| Unit shown | Bytes per unit |
|---|---|
| 1 b | 0.125 B |
| 1 B | 1 B |
| 1 KB | 1,024 B |
| 1 MB | 1,048,576 B |
| 1 GB | 1,073,741,824 B |
| 1 TB | 1,099,511,627,776 B |
Frequently Asked Questions
How do I convert bits to kilobytes by hand?
Divide the number of bits by 8 to get bytes, then divide by 1,024 to get the calculator’s KB. For example, 24,576 bits ÷ 8 ÷ 1,024 = 3 KB. To reverse the calculation, multiply the KB value by 1,024 and then by 8.
Why does a 1 TB drive show about 931 GB on my computer?
Drive manufacturers generally label 1 TB as 1,000,000,000,000 bytes. Dividing that by 1,024 three times gives about 931.323 GiB, which some systems display as “GB.” This calculator’s TB means 1,099,511,627,776 bytes, so entering 1 TB here will not reproduce the capacity printed on a decimal-labeled drive.
How do I compare an internet speed in Mbps with a download size in MB?
First distinguish bits from bytes: 8 megabits equal 1 megabyte when both use the same prefix convention. Internet speeds in Mbps usually use decimal millions of bits per second, while this calculator’s MB uses 1,048,576 bytes. For example, 80 Mbps is about 9.54 of this calculator’s MB per second before network overhead; actual downloads may be slower.
Can a file have a size of half a byte?
A quantity can be expressed as 0.5 B, which is 4 bits, but ordinary file sizes are typically whole numbers of bytes. A four-bit value stored in a file may still occupy a full byte unless it shares that byte with other data. Decimal inputs are useful for unit arithmetic, but they do not imply that a filesystem stores fractional bytes.
Why is a file’s “size on disk” larger than its file size?
Filesystems commonly allocate space in blocks, so a small file can occupy an entire block even when it contains only a few bytes. Metadata and filesystem features can also affect reported usage. This converter changes units for a quantity you enter; it cannot infer allocated disk space from the file’s logical size alone.
What is a normal or good file size in MB or GB?
There is no universal good file size; it depends on the content and how it was saved. Compression, image dimensions, video duration, and quality settings can make similar-looking files differ greatly in size. To judge whether a file is suitable, compare it with the upload limit, available storage, or transfer time that matters for your task.
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