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📏 Unit convertersFree
Knots to km/h converter
Turn a wind or boat speed in knots into km/h with the exact factor: 1 knot is 1.852 km/h, because the nautical mile is exactly 1852 m.
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kW to hp converter
Convert kilowatts to mechanical horsepower with the exact constant: 1 kW is 1.341022089595 hp. Made for motor nameplates, car brochures and generator sheets…
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Lbs to ounces converter
Multiply pounds by exactly 16 and get ounces: 1 lb is 16 oz in the avoirdupois system, with nothing left to estimate.
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Vacuum leak rate converter
Convert vacuum leak rates between mbar·L/s, sccm, atm·cc/s, torr·L/s, Pa·m³/s and four more units: 1 mbar·L/s is 59.215396002961 sccm.
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Linear mass density converter
Turn a weight-per-length figure into the unit your sheet asks for: 1.5 kg/m is 1.007953462709 lb/ft.
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Linear energy transfer converter
Move an LET value between the units papers actually use: 1 keV/μm is exactly 10 MeV/cm and 1.602176634 × 10⁻¹⁰ J/m.
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Nominal lumber size converter
See what a stamped board really measures: the 2 in a 2×4 dresses to 1.5 inches, or 38.1 mm, under the standard North American dry softwood rules.
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Luminous energy converter
Switch light totals between the units your report uses: 1 lumen-hour is exactly 3600 lumen-seconds, and a talbot is one lumen-second.
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Luminous exposure converter
Add up light over time in the unit your log uses: 3600 lux seconds make exactly 1 lux hour. Five exposure units, from millilux seconds to phot hours, for museum…
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Magnetic moment converter
Express a dipole moment in the unit your source uses: 1 A·m² is exactly 1000 erg per gauss and the same as 1 J/T.
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Magnetic susceptibility converter
Move a susceptibility value between SI and CGS without four-pi tables: 1 in SI volume units is 0.079577471546 in CGS volume units.
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Magnetomotive force converter
Switch magnetomotive force between SI and CGS without redoing the four-pi factor: 1 ampere-turn is 1.256637061436 gilberts.
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Mass diffusivity converter
Rewrite a diffusion coefficient in the unit your source uses: 1 m²/s is exactly 10000 cm²/s. Eight area-per-time units, from mm²/s to ft²/h and in²/s, for…
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Mass flux converter
Express a mass flux in the unit your data uses: 1 kg/(m²·s) equals 0.1 g/(cm²·s). Six mass-per-area-per-time units, from lab g/(cm²·s) to hourly kg/(m²·h) and…
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Meters per second to mph
1 m/s is 2.236936292054 mph, worked out from the exact 1609.344-meter mile and the 3600-second hour.
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Meters to inches converter
1 meter is 39.370078740157 inches, because an inch is exactly 0.0254 m, or 2.54 cm. Enter a length in meters from a warehouse sheet, a drawing or a cut list and…
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Meters to yards converter
1 meter is 1.093613298338 yards, because a yard is exactly 0.9144 m. Enter a pitch length, a golf distance or a fabric measure in meters and get the yard figure…
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Metric tons to US tons converter
1 metric ton is 1.102311310924 US short tons, because a short ton is exactly 907.18474 kg. Turn tonnes from a manifest or a European freight label into the…
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Miles to yards converter
Half a mile is exactly 880 yards, and a full mile 1760. Enter a route, a course or a haul distance in miles and get the yard figure used on American football…
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ML to teaspoons converter
Divide millilitres by exactly 5 to get teaspoons: 15 ml is 3 teaspoons and 5 ml is 1. It is the same constant as metric measuring spoons and US nutrition…
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Molar conductivity converter
Convert molar conductivity between S·m²/mol and S·cm²/mol, plus their millisiemens and microsiemens forms: 1 S·m²/mol is 10000 S·cm²/mol.
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Molar entropy converter
Switch molar entropy between J/(mol·K), kJ/(mol·K), cal/(mol·K), entropy units and Btu/(lbmol·R): 1 J/(mol·K) is about 0.239005736138 cal/(mol·K).
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Molar flow rate converter
Switch a molar flow between seconds, minutes and hours, in moles or kilomoles: 1 mol/s is 3.6 kmol/h.
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Molar volume converter
Convert molar volume between m³/mol, L/mol, mL/mol, cm³/mol, ft³/mol and in³/mol: 0.0224 m³/mol is 22.4 L/mol, the textbook gas value at standard conditions.
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Nuclear cross section converter
Switch a cross section between barns and area units without a handbook: 1 barn is exactly 10⁻²⁸ square meters, 10⁻²⁴ square centimeters or 100 square fermis…
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Numerical aperture converter
Move between the ways optics catalogs describe a light cone: an NA of 0.5 in air is an f-number of 1, a 30-degree half-angle and a 60-degree full cone, and you…
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Parsecs to light-years converter
One parsec is 3.261563777167 light-years when you follow the exact IAU chain instead of the rough 3.26 shortcut.
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Permeability converter
100 millidarcies are 0.1 darcy, and one darcy is 9.869233 × 10⁻¹³ m². Switch between darcy, millidarcy, microdarcy, nanodarcy and four square-metre units for…
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Permittivity converter
One farad per metre is 1000000000000 picofarads per metre, and a dielectric constant turns into F/m when multiplied by the vacuum permittivity of 8.8541878128 ×…
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Photon energy converter
A 500 nm photon of visible light carries 2.479683968664 eV, oscillates at 599.584916 THz and sits at 20000 cm⁻¹.
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Pressure unit converter
One standard atmosphere is 101325 Pa, 14.6959487755 psi and 760 mmHg. Enter a pressure in any of seven units, from pascals to torr, and read it in all seven at…
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Pressure altitude converter
In the standard atmosphere, 850 hPa sits at 1457.299451504714 m. Convert pressure to altitude and back, or switch between hPa, inHg, mmHg, psi, meters and feet…
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Pressure head converter
10 meters of water column is 14.22334330712 psi, because one meter of water is exactly 9806.65 Pa.
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Rainfall rate converter
Convert rain intensity between five units: 25.4 mm/h is exactly 1 in/h and 1 mm/min is 60 mm/h, so weather bulletins, gauge logs and stormwater sheets from…
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Audio sample rate converter
Relabel a sampling rate in the unit your session, datasheet or homework expects: 44100 Hz is 44.1 kHz, and the five units for audio and data converters switch…
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Screw gauge size converter
Turn a US machine-screw number into the diameter a drawing or catalog quotes: a #6 screw is 0.138 in, 3.5052 mm or 138 mils across, and a measured diameter…
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Section modulus converter
Move a section modulus between the six length-cubed units found in steel handbooks and design guides: 1 in³ is exactly 16.387064 cm³, so metric and imperial…
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Sheet metal gauge converter
Turn a gauge callout into a real thickness and back: 16 gauge steel is 0.0598 in, or 1.51892 mm, from the steel Manufacturer's Standard Gauge table for gauges 3…
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Shutter speed converter
Switch a shutter speed between fractions, decimal seconds, milliseconds, microseconds and APEX stops: 1/125 is 0.008 seconds, or 8 ms, so camera dials…
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Sieve mesh size converter
Read any sieve callout as a real opening and back: 100 US mesh is a 150 µm opening, or 0.15 mm, so lab sieve stacks, supplier sheets and particle-size specs…
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Solar mass, radius & luminosity converter
One solar mass is 1.98847 × 10³⁰ kg. This converter turns M☉, R☉ and L☉ into kilograms, metres and watts, or into Earth and Jupiter units, for star tables…
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Sound absorption converter
100 sabins are 9.290304 metric sabins. Convert an absorption area between sabins, metric sabins and square metres, feet, centimetres or yards when a room…
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Sound power converter
1 watt of acoustic power is exactly 120 dB re 1 pW. Convert sound power between watts, picowatts through megawatts, BTU per hour, erg per second and the level…
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Specific impulse converter
450 seconds of Isp is 4412.9925 m/s of exhaust velocity. Convert specific impulse between seconds, m/s, N·s/kg, km/s, ft/s and lbf·s/lb with standard gravity of…
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Square km to square miles
2.589988110336 square kilometres are exactly 1 square mile, because the mile has been fixed at 1.609344 km since 1959.
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Spring stiffness converter
1000 N/m is 5.710147154733 lbf/in. Convert a spring rate between N/m, N/mm, kN/m, lbf/in, lbf/ft and kg/mm or kgf/mm when a coil-spring catalogue, a suspension…
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Guitar string gauge converter
A 9-gauge high E is 9 thousandths of an inch: 0.009 in, or 0.2286 mm. Turn the gauge printed on a string packet into mils, inches, millimetres, centimetres and…
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Surface charge density converter
1 C/m² is 0.0001 C/cm². Convert surface charge density between coulombs per square metre, centimetre, millimetre, inch and foot, plus milli-, micro- and…
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Thermal conductance converter
1 W/K is 1.895634240627 BTU/(h·°F). Convert a heat flow per degree of temperature difference between SI, calorie and BTU units, and get the factor applied plus…
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Thermal expansion coefficient converter
0.000012 per kelvin is 12 ppm/K. Switch a linear expansion coefficient α between kelvin, Celsius, Fahrenheit and Rankine forms, as plain reciprocal degrees…
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Thread count converter
200 TPI is 78.740157480315 threads per centimetre. Convert a fabric's thread density between TPI, threads per centimetre, per ten centimetres, per metre and per…
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Thread pitch converter
A 20 TPI bolt has a 1.27 mm pitch. Switch a screw thread between threads per inch and metric pitch, and see inch pitch, threads per centimetre and per…
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Torr to PSI converter
760 torr, one standard atmosphere, is 14.695948775513 psi. Turn a vacuum or lab reading in torr into the pounds per square inch shown on US gauges and…
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Turbidity converter
10 NTU is 10 FNU on formazin standards. Convert a water-clarity or haze reading between NTU, FNU, FTU, FAU, JTU, brewery EBC and silica ppm, and get the factor…
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Vacuum pressure converter
760 torr make one standard atmosphere, 101,325 Pa. Convert vacuum readings between torr, millitorr, microns, mmHg, millibar, pascals, kilopascals, hectopascals…
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Water conductivity & TDS converter
Turn a meter reading into the unit your log asks for: 500 µS/cm becomes 250 ppm of dissolved solids with the usual 0.5 factor, which you can change to match…
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Cups to grams converter
Two cups of all-purpose flour weigh 240 g, because flour is listed at 120 g per cup. Choose the ingredient, enter the cups, even as a fraction, and get the…
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Fluid ounces to ml converter
Eight US fluid ounces are 236.5882365 ml, while one imperial fluid ounce is 28.4130625 ml, about 4% smaller than the US one.
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Flour cups to grams converter
Two cups of all-purpose flour weigh 240 g, but bread and cake flour do not: each type has its own density of 120, 127 or 114 g per cup.
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Gas mark converter
Gas Mark 4 is 180 °C or 350 °F on the standard British oven table. Enter any mark from a quarter to nine, or a listed temperature with its scale, and get the…
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