Convert between bytes, KB, MB, GB, and TB with precise binary and decimal calculations.
Input the dimensions, format, and quality of your file.
See the calculated file size in bytes, KB, MB, or GB.
Check how different formats affect the final file size.
A converter for file and storage sizes. Type a value in any common unit - bytes, KB, MB, GB, or TB - and get the equivalent in every other unit, computed in your choice of two counting systems: decimal (1000-based, how drive manufacturers label capacity) or binary (1024-based, how operating systems count and how RAM is sold). The thing that surprises most people: the two systems differ by roughly 7% at GB and 10% at TB, which is exactly why a new 1 TB hard drive appears as about 931 GB on a Windows machine. The conversion happens entirely in the browser; nothing you enter is uploaded.
A concrete input and expected output from the current implementation.
Input
1 TB (decimal)
Expected output
1,000,000,000,000 bytes = 1,000 GB (decimal) = 931.32 GiB = 0.9095 TiB (binary)
A drive labeled 1 TB is sold in decimal: exactly 10^12 bytes. In binary, that count divides into 931.32 GiB (by 2^30) or 0.9095 TiB (by 2^40) - the figures an operating system reports for the same drive.
The binary (IEC) chain multiplies by 1024 per step: 1 KiB = 1024 bytes, 1 MiB = 1024 KiB, up to TiB. The decimal (SI) chain multiplies by 1000: 1 KB = 1000 bytes, 1 MB = 1000 KB. The tool converts the value you enter to a byte count, then scales it to every unit shown. Both conversions are exact; the two systems diverge by 2.4% per step.
Results come back across the full unit range, with binary (KiB, MiB) and decimal (KB, MB) labels kept distinct so each figure can be matched to the base your operating system or drive label actually uses. Displayed values are rounded to a fixed number of decimal places, so converting a rounded result back to its original unit will not reproduce your exact input; a small drift there is rounding, not a calculation error.
The two figures count in different bases. The drive is labeled in decimal, so 1 TB = 1,000,000,000,000 bytes. Windows reports in binary, where 1 GiB = 1,073,741,824 bytes; dividing 1,000,000,000,000 by that gives 931.32 GiB. No capacity is missing or faulty - every terabyte drive loses the same ~9% to the base difference.
Both meanings circulate. The SI standard defines kilo as exactly 1000, and the binary unit for 1024 bytes is KiB, but operating systems have long displayed 1024-based counts with plain KB labels. Use the tool's decimal side to match drive labels and its binary side to match what the OS reports, and the ambiguity stops mattering.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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