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
- 15
- Unit
- nm, µm, mm, cm, m, km
Unit families
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.
- Base unit
- m²
- All target values
- 11
- 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
- 13
- Unit
- ml, cl, dl, l, m³, tsp
- Base unit
- g
- All target values
- 9
- Unit
- µg, mg, g, kg, t, oz
- 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
- 12
- Unit
- bit, B, KB, MB, GB, TB
- Base unit
- m/s
- All target values
- 7
- Unit
- m/s, km/h, mph, kn, ft/s, c
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
- 10
- 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
- 11
- 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, ′, ″
- Base unit
- N
- All target values
- 5
- Unit
- N, kN, MN, lbf, kgf
- 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
- 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
- Base unit
- Hz
- All target values
- 6
- Unit
- Hz, kHz, MHz, GHz, rpm, bpm
Data rate
Mbit/s and MB/s differ by a factor of eight because one byte holds eight bits. Providers usually advertise Mbit/s while download tools display MB/s.
Table- Base unit
- bit/s
- All target values
- 12
- Unit
- bit/s, kbit/s, Mbit/s, Gbit/s, Tbit/s, B/s
Flow rate
Flow rate is volume per time, not volume. A pipe volume in litres cannot be converted into l/min directly; the time base is required.
Table- Base unit
- m³/s
- All target values
- 9
- Unit
- m³/s, m³/h, l/s, l/min, l/h, ml/min
Acceleration
Lower-case g as acceleration (9.80665 m/s²) is not the gram. In engineering g usually means standard gravity; in commerce it means gram.
Table- Base unit
- m/s²
- All target values
- 4
- Unit
- m/s², g, Gal, ft/s²
Electric charge
Ampere hours measure charge, watt hours measure energy. mAh and Wh are only linked through voltage: Wh = Ah × volts. Two batteries with identical mAh can store different amounts of energy.
Table- Base unit
- C
- All target values
- 5
- Unit
- C, mC, kC, Ah, mAh