Browse unit converter categories

Measure two-dimensional surface size for rooms, land, construction, manufacturing, and science without confusing length or volume.

Compare three-dimensional capacity for cooking, liquids, storage, shipping, construction, and laboratories across metric and customary systems.

Compare elapsed duration from nanoseconds to days for computing, experiments, schedules, media, and other time-interval measurements.

Measure rotation or separation between directions for geometry, navigation, surveying, engineering, machining, and trigonometric calculations.

Express how quickly velocity changes for vehicles, motion analysis, engineering, physics, and gravitational calculations.

Express pushes and pulls for mechanics, structures, machinery, propulsion, testing, and engineering without confusing force with mass.

Compare torque, the rotational turning effect used for fasteners, engines, machinery, tools, drivetrains, and mechanical design.

Measure the capacity to do work across electricity, heat, mechanics, food, fuels, and scientific calculations using compatible energy units.

Compare power, the rate of energy transfer, for electrical equipment, engines, heating, machinery, lighting, and engineering calculations.

Compare momentum, the product of mass and velocity, for collisions, vehicles, projectiles, mechanics, sports analysis, and physics.

Compare impulse, or force applied over time, and the resulting momentum change for impacts, propulsion, testing, and mechanics.

Compare rotational speed for shafts, wheels, motors, turbines, machinery, robotics, astronomy, and motion analysis.

Express how quickly rotational velocity changes for machinery, vehicles, robotics, dynamics, control systems, and physics calculations.

Measure resistance to rotational acceleration for shafts, wheels, vehicles, machinery, robotics, and structural dynamics.

Compare stored energy per unit volume for batteries, fuels, capacitors, materials, and energy-system design.

Measure energy per unit mass for batteries, fuels, food, materials, mechanical systems, and performance comparisons.

Compare pressure, or force distributed over an area, for weather, engineering, tires, hydraulics, vacuum systems, and industrial processes.

Relate mass to volume for materials, liquids, gases, laboratory samples, engineering specifications, and quality control.

Measure fluid volume moving over time through pipes, pumps, ventilation, water systems, and industrial process equipment.

Track mass moving per unit of time through process lines, engines, dosing equipment, ventilation, and chemical systems.

Compare dynamic viscosity, a fluid’s resistance to shear and flow, for lubrication, coatings, pumping, manufacturing, and laboratory analysis.

Compare kinematic viscosity, which relates flow resistance to density, for lubricants, fuels, hydraulic fluids, standards testing, and engineering.

Compare force along a liquid surface for coatings, droplets, capillary behavior, materials testing, and fluid science.

Linear mass density expresses mass per unit length for cables, fibers, yarn, rails, pipes, and continuous manufactured products.

Measure mass per unit area for paper, fabrics, coatings, films, roofing, composites, and material specifications.

Compare volume occupied per unit mass for gases, fluids, thermodynamics, process engineering, and material-state calculations.

Compare data storage capacity across bits, bytes, decimal prefixes, and binary prefixes for files, memory, drives, and systems.

Compare data transfer rates across networks, storage devices, communication links, streaming services, and computer interfaces.

Compare the rate of electric charge flow for circuits, electronics, power systems, instrumentation, and component specifications.

Express quantities of electric charge for electronics, batteries, electrochemistry, particles, capacitors, and physics calculations.

Compare electric potential difference for batteries, circuits, power supplies, electronics, transmission systems, and laboratory measurements.

Compare electrical resistance, or opposition to current, in components, wiring, sensors, circuits, power systems, and diagnostic testing.

Express how readily a component or circuit carries electric current for electronics, sensing, testing, and electrical analysis.

Capacitance describes electric charge storage capability for capacitors, circuits, filters, power supplies, sensors, and electronic design.

Compare inductance, magnetic energy storage, and opposition to current change in coils, transformers, filters, motors, and circuits.

Compare total magnetic field passing through a surface for motors, transformers, generators, sensors, and electromagnetic analysis.

Measure magnetic flux per unit area for magnets, motors, transformers, field mapping, sensing, and materials testing.

Measure electric force per charge across insulation, capacitors, sensors, high-voltage systems, and electromagnetic analysis.

Express magnetizing field intensity for coils, magnetic materials, motors, transformers, testing, and electromagnetic design.

Compare a material’s electrical opposition to current for conductors, semiconductors, insulation, cables, and engineering.

Compare electrical conductivity in metals, water, solutions, and semiconductors for engineering, testing, and material selection.

Electric current density compares current per unit area in conductors, semiconductors, batteries, electrochemistry, and component design.

Measure electric charge per unit length for cables, beams, electrostatics, transmission structures, and field calculations.

Surface charge density expresses electric charge per unit area on conductors, capacitors, interfaces, materials, and electrostatic models.

Measure electric charge per unit volume in plasmas, semiconductors, beams, materials, and electromagnetic calculations.

Compare how materials respond to electric fields for capacitors, insulation, dielectrics, microwave systems, and electromagnetic design.

Magnetic permeability describes how materials support magnetic fields in cores, transformers, motors, inductors, shielding, and materials testing.

Compare light arriving on a surface for workplaces, architecture, photography, displays, horticulture, and lighting compliance.

Measure three-dimensional angular extent for optics, lighting, radiation, astronomy, imaging, and directional coverage calculations.

Compare light emitted in a particular direction for lamps, LEDs, beacons, optical systems, and photometric specifications.

Measure total visible light output for lamps, luminaires, projectors, LEDs, lighting design, and energy-efficiency comparisons.

Compare luminance, or perceived light intensity from a surface, for displays, signs, imaging, road lighting, and visual ergonomics.

Describe how readily heat passes through materials used in insulation, construction, electronics, manufacturing, and engineering.

Compare heat required to change an object’s temperature for calorimetry, thermal storage, engineering, and laboratory work.

Measure heat required per unit mass and temperature change for materials, fluids, thermal design, and calorimetry.

Express heat transfer rate per unit area for insulation, furnaces, electronics cooling, buildings, and thermal testing.

Measure heat transfer across a surface per area and temperature difference for exchangers, buildings, cooling, and process equipment.

Compare how quickly temperature changes spread through materials for heating, cooling, manufacturing, geology, and thermal analysis.

Measure opposition to heat flow across components, insulation assemblies, electronics, buildings, and thermal interfaces.

Compare intrinsic material resistance to heat conduction for insulation, construction products, geology, and thermal engineering.

Express thermodynamic entropy for heat engines, phase changes, process analysis, energy systems, and physical chemistry.

Compare entropy per unit mass for steam tables, turbines, refrigeration, process engineering, and thermodynamic analysis.

Compare amount of substance for chemical reactions, laboratory preparations, molecular counting, stoichiometry, and analytical work.

Compare catalytic activity through reaction rates used for enzymes, clinical assays, biochemistry, industrial processes, and laboratory analysis.

Molar mass relates mass to amount of substance for chemistry, formula calculations, solution preparation, materials, and laboratory analysis.

Measure amount of substance per solution volume for chemistry, analytical testing, medicine, and laboratory preparation.

Mass concentration expresses substance mass per volume for air, water, solutions, emissions, medicine, and quality testing.

Measure volume per amount of substance for gases, solutions, chemistry, materials science, and thermodynamic calculations.

Compare frequency as repeating events per unit of time for signals, sound, electronics, rotation, communications, and science.

Compare spatial frequency expressed as cycles or radians per distance for spectroscopy, waves, optics, and quantum physics.