Inch, foot and mile use fixed factors. Errors usually come from early rounding or from mixing land miles and nautical miles.
Formulas
Formulas
UnitCloud is a calculation aid. Standards, contracts, medical decisions, engineering approvals and official requirements need original sources.
Area scales quadratically. A length factor is not automatically an area factor.
Volume is robust for liquids. For dry ingredients it does not replace weighing because density and packing vary.
Pound is not always the same local unit. UnitCloud uses international avoirdupois values.
Temperature uses an offset. Fahrenheit and Kelvin are not pure factor units.
KB, MB and GB are decimal. KiB, MiB and GiB are binary. This distinction explains many apparent storage gaps.
Knots are nautical miles per hour. mph and knots are not interchangeable imperial speeds.
Food calories are kilocalories. Utility bills use kilowatt-hours. Both are energy units, but in different contexts.
PS and hp are not identical. Vehicle data often uses metric horsepower, while US/UK contexts often use mechanical horsepower.
bar, psi and atm appear in different fields. Tyre, weather and lab values need context.
Density depends on temperature, material state and measurement conditions. Unit conversion does not replace material data.
Calendar months and years vary. This family uses fixed seconds for technical durations, not legal deadlines.
Degrees and radians are often mixed in software, geometry and trigonometry. Formulas usually expect a specific angle unit.
Force and mass are not the same. Kilogram is mass, newton is force.
Torque is not power. Newton metre and hp/kW answer different questions.
mpg and l/100 km move in opposite directions. Higher mpg means lower consumption; higher l/100 km means higher consumption.
px depends on output context. UnitCloud uses the CSS reference of 96 px per inch.
Pixel count and print density are different. Print sizes also need width, height and ppi.
rpm and bpm are events per minute. Hz is events per second.