Unit converters
546 unit converters: length, weight, temperature, volume, speed, pressure, energy, data and cooking measures. Type a value, pick the units and get an exact result with the conversion factor shown, free in your browser.
Electron mobility converter
1400 cm²/(V·s), roughly the electron mobility of silicon, is 0.14 m²/(V·s). Convert carrier mobility between square metres, centimetres and millimetres per volt…
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Entropy converter
One calorie per kelvin is exactly 4.184 joules per kelvin. Convert entropy between joules, kilojoules, calories and kilocalories per kelvin, BTU per Rankine and…
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Equivalent weight converter
Switch a chemical equivalent weight between eight units in one step: 49.04 g/eq reads as 49.04 mg/meq, and 1 kg/eq is exactly 1000 g/eq.
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Fabric weight converter
Read a fabric weight on the scale your supplier or customer uses: 200 gsm is 5.898704936329 oz/yd², with exact ounce, pound, yard and foot definitions across…
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Fahrenheit to Rankine converter
Move a Fahrenheit reading onto the absolute Rankine scale by adding exactly 459.67: water's freezing point, 32 °F, becomes 491.67 °R.
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Film speed converter
Read any film speed on the scale you need: ISO 100 film is 21 DIN, still 100 in ASA and Sv 5 in APEX terms, with GOST covered too.
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Foot-pounds to newton-meters converter
Turn a foot-pound torque or work figure into SI newton-meters with the full exact constant: 10 ft·lbf is about 13.56 N·m, with no truncated shortcut creeping…
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Gallons to cups converter
One US liquid gallon is exactly 16 cups, so 2.5 gallons come out as 40 cups with no rounding guesswork.
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Gallons to quarts converter
Every US liquid gallon splits into exactly 4 quarts, so 2.5 gallons are 10 quarts. Useful when a tank, a jug or a bulk recipe is measured in gallons but the…
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Glove size converter
A hand measuring 20.3 cm around the knuckles is about 8 inches, which is glove size 8, a medium. Enter centimetres, inches, a numeric size or a letter and see…
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Hardness scale converter
A steel part at 40 HRC reads about 371.4 Brinell or 392 Vickers. Convert between Rockwell C, B and A, Brinell, Vickers and Knoop through one steel reference…
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Hectares to acres converter
One hectare is exactly 10000 square metres, which makes it 2.471053814672 international acres. Turn farm, forest or cadastral areas into the acres used in…
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Humidity ratio converter
0.01 kg/kg of moisture is 70 grains per pound: switch a mixing ratio between six units when an HVAC grains table, an SI model and a weather report disagree…
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Hydraulic conductivity converter
0.00001 m/s of hydraulic conductivity is 3.6 cm/h: switch a K value between eleven metric and US units while you read a borehole log, a packer test or a liner…
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Imperial gallons to US gallons converter
1 imperial gallon is 1.200949925505 US gallons: turn a British volume into the smaller US liquid gallon for American packaging, fuel logs, imported recipes and…
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Inches to cm converter
12 inches is 30.48 cm: multiply any inch length by the exact 2.54 and see the working on one line, for size charts, product listings, homework, shipping labels…
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Jerk converter
1 m/s³ is 0.101971621298 g/s: move a jerk value between six units when ride-comfort limits come in g/s, robot motion profiles in m/s³ and an old lab sheet in…
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Joules to foot-pounds converter
1 joule is 0.737562149277 foot-pounds: turn an SI energy figure into the ft·lbf found in mechanics textbooks, impact and ballistic tables and North American…
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kg/m³ to lb/ft³ converter
1000 kg/m³ is 62.427960576145 lb/ft³: turn an SI density from a lab report, a European label or a fluid-mechanics problem into the bulk density on US materials…
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KG to stone converter
Turn a weight in kilograms into British stone with the exact factor: 6.35029318 kg make 1 stone, and 70 kg come to just over 11 stone.
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KM to miles converter
Divide kilometers by exactly 1.609344 and get statute miles: 1.609344 km make exactly 1 mile, with no 0.62 rule of thumb in between.
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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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