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Unit Converters

A set of converters over a fixed table of conversion factors, plus temperature, which needs real formulas rather than a multiplier because its scales do not share a zero point.

The arithmetic is done in standard double-precision floating point, the same as any spreadsheet or calculator, so results are exact enough for everyday work but are not arbitrary-precision. The number of digits shown is a display choice; it does not mean the input was that precise.

Tools in Unit Converters

Time Zone Converter

Convert a time between zones and see current world times.

Length Converter

Convert meters, feet, miles, etc.

Weight & Mass

Convert kg, pounds, ounces, etc.

Temperature

Celsius, Fahrenheit, Kelvin.

Volume Converter

Liters, gallons, cups, etc.

Area Converter

Square meters, acres, hectares.

Digital Storage

Bits and bytes in binary and decimal multiples.

Speed Converter

MPH, KM/H, knots, Mach.

Time Converter

Seconds, minutes, hours, days.

Power Converter

Watts, kilowatts, horsepower.

Energy Converter

Joules, calories, KWH, BTUs.

Pressure Converter

Pascals, bar, PSI, atmospheres.

Data Transfer

Mbps vs MB/s (Internet Speed).

How these tools behave

  • Digital storage units here are binary: 1 KB is treated as 1024 bytes. Storage manufacturers usually use 1000. Both conventions are labelled in the tool.
  • Month and year in the time converter are averages, not calendar-accurate durations.

Frequently asked questions

Why does a converted value show a long string of digits?

Binary floating-point arithmetic cannot represent every decimal exactly, so a conversion can end in a repeating tail. The display rounds it; the rounding is cosmetic, not an error in the conversion factor.

Which conversion factors are used?

Internationally defined exact values where they exist, such as 1 inch = 25.4 mm, and standard published values elsewhere. Approximations, such as the length of a month, are marked as approximate.

Guides