Convert units without mixing up bits, bytes and prefixes

Understand the settings

A unit conversion expresses the same quantity using another scale. Most categories use a factor to convert through a base unit. Temperature also needs an offset: doubling a Celsius number does not double its absolute temperature.

Storage and network labels are easy to confuse. One byte is eight bits. Decimal MB uses 1,000,000 bytes; binary MiB uses 1,048,576 bytes. A 1 Gbit/s link corresponds to 125 MB/s or about 119.21 MiB/s before protocol overhead. This calculator converts units; it does not predict real network throughput.

The time category treats a day as exactly 86,400 seconds and a week as seven such days. Calendar months, civil-time daylight-saving transitions and calendar years are deliberately excluded because they are not fixed-duration unit conversions.

Step by step

1. Choose a quantity category.
2. Enter a finite number and select the source and destination units.
3. Calculate. The output uses up to 12 significant digits.
4. Check the unit label when copying a number into another program; MB and MiB are different units.

Compare disk-size labels

Choose Storage, enter 1000, select GB as the source and GiB as the destination. The result is about 931.322574615 GiB. No storage disappeared: the two labels use different byte counts.

Limits and what to check

• Uses JavaScript floating-point arithmetic and displays up to 12 significant digits. It is not an arbitrary-precision metrology tool.
• Temperature below absolute zero is rejected.
• Mass uses ordinary avoirdupois ounces/pounds, not troy units. No currency exchange or ambiguous cooking volumes.
• All calculations are local to the browser.

Troubleshooting