Unit families

UnitCloud is a local measurement lab for everyday work, engineering, IT, energy, mobility and design. Every conversion shows result, formula, base unit, rounding and the common mistake.

Length

Inch, foot and mile use fixed factors. Errors usually come from early rounding or from mixing land miles and nautical miles.

Table

Base unit: m
All target values: 11
Unit: nm, µm, mm, cm, m, km

Area

Area scales quadratically. A length factor is not automatically an area factor.

Table

Base unit: m²
All target values: 8
Unit: mm², cm², m², km², ha, acre

Volume

Volume is robust for liquids. For dry ingredients it does not replace weighing because density and packing vary.

Table

Base unit: l
All target values: 11
Unit: ml, cl, dl, l, m³, tsp

Mass

Pound is not always the same local unit. UnitCloud uses international avoirdupois values.

Table

Base unit: g
All target values: 8
Unit: µg, mg, g, kg, t, oz

Temperature

Temperature uses an offset. Fahrenheit and Kelvin are not pure factor units.

Table

Base unit: °C
All target values: 4
Unit: °C, °F, K, °R

Data

KB, MB and GB are decimal. KiB, MiB and GiB are binary. This distinction explains many apparent storage gaps.

Table

Base unit: Byte
All target values: 10
Unit: bit, B, KB, MB, GB, TB

Speed

Knots are nautical miles per hour. mph and knots are not interchangeable imperial speeds.

Table

Base unit: m/s
All target values: 5
Unit: m/s, km/h, mph, kn, ft/s

Energy

Food calories are kilocalories. Utility bills use kilowatt-hours. Both are energy units, but in different contexts.

Table

Base unit: J
All target values: 8
Unit: J, kJ, Wh, kWh, cal, kcal

Power

PS and hp are not identical. Vehicle data often uses metric horsepower, while US/UK contexts often use mechanical horsepower.

Table

Base unit: W
All target values: 6
Unit: W, kW, MW, PS, hp, BTU/h

Pressure

bar, psi and atm appear in different fields. Tyre, weather and lab values need context.

Table

Base unit: Pa
All target values: 8
Unit: Pa, kPa, MPa, bar, mbar, psi

Density

Density depends on temperature, material state and measurement conditions. Unit conversion does not replace material data.

Table

Base unit: kg/m³
All target values: 4
Unit: kg/m³, g/cm³, g/l, lb/ft³

Time

Calendar months and years vary. This family uses fixed seconds for technical durations, not legal deadlines.

Table

Base unit: s
All target values: 7
Unit: ms, s, min, h, d, week

Angle

Degrees and radians are often mixed in software, geometry and trigonometry. Formulas usually expect a specific angle unit.

Table

Base unit: rad
All target values: 6
Unit: rad, °, gon, turn, ′, ″

Force

Force and mass are not the same. Kilogram is mass, newton is force.

Table

Base unit: N
All target values: 5
Unit: N, kN, MN, lbf, kgf

Torque

Torque is not power. Newton metre and hp/kW answer different questions.

Table

Base unit: N·m
All target values: 4
Unit: N·m, lb·ft, lb·in, kgf·m

Fuel economy

mpg and l/100 km move in opposite directions. Higher mpg means lower consumption; higher l/100 km means higher consumption.

Table

Base unit: l/100 km
All target values: 4
Unit: l/100 km, km/l, mpg US, mpg imp

Typography

px depends on output context. UnitCloud uses the CSS reference of 96 px per inch.

Table

Base unit: pt
All target values: 6
Unit: pt, pc, in, mm, cm, px

Image resolution

Pixel count and print density are different. Print sizes also need width, height and ppi.

Table

Base unit: px
All target values: 4
Unit: px, kpx, MP, GP

Frequency

rpm and bpm are events per minute. Hz is events per second.

Table

Base unit: Hz
All target values: 6
Unit: Hz, kHz, MHz, GHz, rpm, bpm