Calculators

Common use cases

• Converting a Unix timestamp to a human-readable date while debugging logs
• Validating a cron expression before deploying a scheduled job
• Checking whether a text/background color pair meets WCAG contrast requirements

All Calculators

• Unix Timestamp Converter — Convert Unix timestamps and date strings with relative time.
• Cron Expression Calculator — Parse cron expressions into human-readable schedules and next run times.
• Color Contrast Ratio Calculator — Calculate WCAG contrast ratio between two hex colors.
• Storage / Data Size Converter — Convert between binary (KiB/MiB/GiB) and decimal (KB/MB/GB) storage units.

Frequently Asked Questions

What's the difference between MB and MiB in the data size converter?

MB (megabyte) uses base-10 — 1 MB = 1,000,000 bytes — the convention storage manufacturers use. MiB (mebibyte) uses base-2 — 1 MiB = 1,048,576 bytes — the convention operating systems typically use to report file sizes. This is why a '500 GB' drive shows as roughly 465 GiB in your OS.

What WCAG contrast ratio should I target?

WCAG AA requires a 4.5:1 ratio for normal text and 3:1 for large text (18pt+ or 14pt+ bold). WCAG AAA raises that to 7:1 and 4.5:1 respectively.

Does the cron expression calculator support non-standard syntax like @daily?

Standard 5-field cron syntax is fully supported; check the tool page itself for which shorthand expressions are recognized, since support varies by the underlying cron implementation you're targeting.