How file size conversion works
This calculator uses decimal storage units, where each larger unit is 1,000 times the previous unit.
You can select any supported unit as the source and any other supported unit as the target. The calculator first converts the entered value to bytes and then converts that byte value to the selected target unit.
File size conversion examples
One gigabyte equals 1,000 megabytes, 1,000,000 kilobytes or 1,000,000,000 bytes using decimal storage units.
The conversion also works in the opposite direction. For example, 500 MB equals 0.5 GB, while 2 TB equals 2,000 GB.
Why very small values should not simply show zero
Converting a small unit to a much larger unit can produce a very small decimal result. For example, one byte is 0.000001 MB rather than zero. The calculator keeps enough precision to display these small conversions meaningfully.
Binary units such as KiB, MiB and GiB use powers of 1,024 and are different from the decimal units used by this calculator.
Frequently asked questions
Can I convert MB to KB?
Yes. Select MB as the From unit and KB as the To unit. One MB equals 1,000 KB using decimal units.
Can I convert TB directly to bytes?
Yes. Any supported unit can be converted directly to any other supported unit.
How many MB are in one GB?
1,000 MB using decimal units.
How many bytes are in one MB?
1,000,000 bytes using decimal units.
Is GB the same as GiB?
No. GB is decimal while GiB is a binary unit based on powers of 1,024.
Using this calculator effectively
This calculator converts file sizes between decimal bytes, KB, MB, GB and TB. It is useful when storage, transfer or product specifications use different decimal units and you want a consistent comparison.
Common uses
- Converting MB to GB or GB to MB.
- Comparing file sizes with storage or transfer limits.
- Checking decimal storage values before using them in another calculator.
Tips for a better estimate
- Check whether the source uses decimal units such as GB or binary units such as GiB.
- Do not mix GB and GiB as if they were the same quantity.
- Keep enough decimal places when converting a value that will be used in a later calculation.
Helpful guides
File Size Explained: KB, MB, GB and TB · Download Speed and Download Time Explained
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