20 directions
Length conversions
Length is the SI base quantity with dimension L; the metre (m) is its SI base unit.
- m
- km
- cm
- mi
- ft
Unit conversion index
Choose the quantity before choosing the units
Start with length, energy, pressure or another physical quantity. Each family keeps its five unit definitions, variants, factors and all 20 conversion directions together.
Review status
The structured records have passed automated schema, factor, source-reference and generator checks. Their status is machine-reviewed-pending-human; this is not a claim of specialist or human editorial approval.
20 quantities
Conversion families
20 directions
Area conversions
Area is a derived quantity representing the extent of a surface and has dimension L²; its coherent SI unit is the square meter (m²).
- m²
- km²
- ha
- ac
- ft²
20 directions
Volume conversions
Volume is a derived quantity representing three-dimensional space and has dimension L³; its coherent SI unit is the cubic meter (m³).
- L
- mL
- m³
- gal
- cup
20 directions
Mass conversions
Mass is the SI base quantity with dimension M; the kilogram (kg) is its SI base unit.
- g
- kg
- mg
- lb
- oz
20 directions
Time conversions
Time is the SI base quantity with dimension T; the second (s) is its SI base unit. This family represents elapsed duration, not a civil timestamp.
- s
- min
- h
- d
- wk
20 directions
Speed conversions
Speed is the magnitude of the rate of change of distance with time and has dimension L T⁻¹; its coherent SI unit is meter per second (m/s).
- m/s
- km/h
- mph
- kn
- ft/s
20 directions
Energy conversions
Energy and work are derived quantities with dimension M L² T⁻²; the coherent SI unit is the joule (J), equal to N·m or kg·m²·s⁻².
- J
- kJ
- kWh
- cal_th
- Btu_IT
20 directions
Power conversions
Power is the rate of energy transfer or work per unit time and has dimension M L² T⁻³; the coherent SI unit is the watt (W), equal to J/s.
- W
- kW
- MW
- hp
- Btu_IT/h
20 directions
Pressure conversions
Pressure is force divided by area and has dimension M L⁻¹ T⁻²; the coherent SI unit is the pascal (Pa), equal to N/m².
- Pa
- kPa
- bar
- psi
- atm
20 directions
Angle conversions
Plane angle is a derived quantity treated within the SI as a quantity with the unit one; the radian (rad) is its coherent SI unit. This family uses the degree as its conversion base for compatibility with the existing calculators.
- °
- rad
- gon
- turn
- arcmin
20 directions
Frequency conversions
Frequency is the number of periodic cycles per unit time; the hertz (Hz) is the coherent SI unit and equals one reciprocal second. In this family, rpm is treated specifically as rotational frequency.
- Hz
- kHz
- MHz
- GHz
- rpm
20 directions
Force conversions
Force is the mechanical quantity represented by mass times acceleration; the newton (N), equal to kg m s^-2, is its coherent SI unit.
- N
- kN
- lbf
- dyn
- kgf
20 directions
Torque conversions
Torque, or moment of force, is the cross product of a position vector and a force vector; its coherent SI unit is the newton metre (N m).
- N·m
- kN·m
- lbf·ft
- lbf·in
- kgf·m
20 directions
Density conversions
Mass density is mass divided by volume; its coherent SI unit is kilogram per cubic metre (kg/m³).
- kg/m³
- g/cm³
- kg/L
- lb/ft³
- lb/US gal
20 directions
Flow Rate conversions
Volumetric flow rate is volume divided by time. This family uses litre per minute as its calculation base while retaining exact SI and defined customary volume relationships.
- L/min
- L/s
- m³/h
- gpm
- cfm
20 directions
Data Size conversions
Digital information size in this family is expressed in bytes, where one byte is eight bits. Decimal SI prefixes and binary IEC prefixes are kept distinct.
- B
- kB
- MB
- GB
- KiB
20 directions
Electric Current conversions
Electric current is an SI base quantity; the ampere (A) is its SI base unit and is defined through the fixed numerical value of the elementary charge.
- A
- mA
- µA
- kA
- MA
20 directions
Voltage conversions
Electric potential difference, commonly called voltage, uses the volt (V), the coherent SI derived unit equal to watt per ampere.
- V
- mV
- µV
- kV
- MV
20 directions
Capacitance conversions
Capacitance uses the farad (F), the coherent SI derived unit equal to coulomb per volt.
- F
- mF
- µF
- nF
- pF
20 directions
Electrical Resistance conversions
Electrical resistance uses the ohm (Ω), the coherent SI derived unit equal to volt per ampere.
- Ω
- mΩ
- kΩ
- MΩ
- GΩ