SMALL DETAILS. USEFUL CHECKS.
File size calculator
Compare bytes, decimal MB and binary MiB without mixing units. Choose a local file or enter a known size.
01 / YOUR DETAILS
A little clarity starts here.
Enter your details, then run the check.
SMALL DETAILS. USEFUL CHECKS.
Compare bytes, decimal MB and binary MiB without mixing units. Choose a local file or enter a known size.
01 / YOUR DETAILS
Enter your details, then run the check.
Decimal prefixes use powers of 1,000; binary prefixes use powers of 1,024. The file’s byte count is read locally without reading its contents. Values above the safe integer range are rejected.
NIST binary prefixes; calculations and text adapted by HandInCheck, 2026-10-04. NIST does not endorse this tool. NIST non-SRD data terms; no copied dataset or prose, constants independently encoded
NIST defines 1 MiB as 1,048,576 bytes. This equals 1.048576 MB. A 5 MB limit is 5,000,000 bytes, not 5 MiB.
The receiving platform may label its limit ambiguously. Confirm its definition. This calculator does not compress, upload or validate file contents.