SADevToolBox

Converters

Quick, precise conversions for the units developers and everyone else run into: epoch timestamps, time zones, file sizes and everyday measurements.

Unix Timestamp Converter Convert epoch seconds or milliseconds to dates and back. Date/Time Converter Convert dates between time zones and formats. Bytes Converter Convert byte counts to human-readable sizes. KB/MB/GB Converter Compare decimal and binary storage units side by side. Temperature Converter Convert between Celsius, Fahrenheit, Kelvin and Rankine. Length Converter Convert metric and imperial lengths and distances. Weight Converter Convert kilograms, pounds, ounces, stone and more. Speed Converter Convert km/h, mph, m/s, knots and more.

About these tools

Time conversions show both UTC and your local time so you can match log entries and API values to real dates. Data size conversions show both decimal units (KB, MB, GB, powers of 1000) and binary units (KiB, MiB, GiB, powers of 1024), which explains why storage sizes often look different in different programs.

Measurement converters cover metric and imperial units with the conversion formula shown, so you can check the maths yourself.

Frequently asked questions

Why does my 1 TB drive show less space in the operating system?

Drive makers use decimal units (1 TB = 1,000,000,000,000 bytes) while some operating systems count in binary units (1 TiB = 1,099,511,627,776 bytes) but still label them TB. The storage is the same; only the unit differs.