File Size Calculator
Convert file sizes between bytes, KB, MB, GB, TB, and PB using binary 1024-based scaling with automatic or custom unit output.
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Convert digital storage numbers across standard measurement units. Enter any numeric quantity, pick the source unit, and choose the target unit to recalculate the value immediately. The calculator handles conversions across bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes using standard binary steps where each level equals 1024 of the preceding unit. For example, converting 1 MB to KB gives 1024.0. You can also review automatic readable formatting, which steps upward through supported units until reaching the clearest compact representation. The interface rounds calculated numeric outputs to two decimal places for readable precision. If you enter a negative number, the calculator treats it as zero. You enter file sizes as raw numbers, and the tool converts them directly-no file uploads or filesystem access required. This provides quick estimations for storage quotas, transfer budgets, and hardware planning.
Instructions
- Enter the numeric size you want to convert in the Size field.
- Select your starting unit from the From unit menu (B, KB, MB, GB, TB, or PB).
- Choose your desired target unit in the To unit menu.
- Click Run to calculate and view the converted value rounded to two decimal places.
Examples
- Convert 500 MB to GB: enter 500 in the Size field, pick Mb in the From unit menu, choose Gb in the To unit menu, and click Run to get 0.49 GB.
- Convert 2048 KB to MB: enter 2048 in Size, select Kb as the starting unit, choose Mb as the target unit, and click Run to produce 2.0 MB.
FAQ
Does this calculator use 1000 or 1024 bytes per kilobyte?
This tool uses binary 1024-based scaling for all calculations, meaning 1 KB equals 1024 bytes, 1 MB equals 1024 KB, and each higher unit scales by a factor of 1024.
How are negative numbers handled?
If you enter a negative number, the calculator treats it as zero, so the result will be zero.
Do I need to upload an actual file to check its size?
No. You simply type or paste the numeric size into the input field and select your units.