Guides and references
Practical unit explanations, standards and worked examples to help you choose the right conversion.
Understanding SI prefixesA practical guide to kilo, mega, giga, milli, micro and scientific notation.↗Metric and imperial units comparedLearn the exact definitions behind common distance, mass and volume conversions.↗How temperature conversion worksCelsius and Fahrenheit require offsets; they are not simple scale-factor conversions.↗Bits, bytes and binary storage unitsUnderstand why storage capacity and connection speed often use different prefixes.↗Density, volume and cooking measurementsVolume and mass are different: converting between them depends on the material’s density.↗Rounding and significant figuresWhy a displayed result may show fewer digits than the underlying calculation.↗Energy and power are not the sameEnergy is an amount; power is the rate at which energy is transferred or used.↗Electrical units at a glanceVoltage, current, resistance, power and charge measure different electrical quantities.↗