Every unit converter on this site does the same thing: multiply your number by a fixed, published conversion factor, then format the result. No approximation, no lookup table that goes stale — just arithmetic that runs the instant you stop typing.
Four groups, one pattern
Common Converters covers the measurements people look up daily — length, weight, area, speed, temperature, data storage and a dozen more. Fluid Converters and Light Converters handle more specialised, mostly scientific or engineering quantities: flow rate, viscosity, luminance, illumination. Electricity Converters covers charge, charge density and energy units. Every converter in all four groups uses the same from/to layout, so once you've used one, you've used them all.
Temperature is the one exception
Length, weight and most other quantities convert by multiplying against a fixed factor. Temperature doesn't — Celsius, Fahrenheit and Kelvin have different zero points, not just different scales — so the temperature converter uses the proper formulas (°F = °C × 9/5 + 32, and so on) instead of a shared multiplication table.
Precision and rounding
Conversions are computed at full floating-point precision and rounded only for display. If a result looks like it's missing a digit, it's a display rounding choice, not a calculation error.
Numeral systems aren't physical units
Numeral Converter and Numbers Converter are grouped with the everyday converters even though they convert between number bases and representations (binary, hexadecimal, Roman numerals) rather than physical quantities — that's simply where people expect to find them.