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.
Damping coefficient converter
100 N·s/m is about 6.852176585679 lbf·s/ft: convert viscous damping coefficients between SI, US customary and cgs units, for shock-absorber datasheets…
Free · Runs in your browser
Diopter converter
2 diopters means a focal length of 500 mm, half a metre. Convert optical power to focal length in m, cm, mm or inches and back, with negative values marked as…
Free · Runs in your browser
DPI / PPI resolution converter
10 dots per millimetre equal 254 dpi, because an inch is exactly 25.4 mm. Convert resolution between dpi, ppi, dpcm, ppcm, dpmm and ppmm for print tickets…
Free · Runs in your browser
Drill bit size converter
A number 7 drill is 0.201 in, 5.1054 mm or 201 mils, closest to a 13/64 fractional bit. Enter a number, letter, fraction or measured diameter and get every…
Free · Runs in your browser
Earthquake magnitude energy converter
A magnitude 6 earthquake radiates about as much energy as 15 thousand tons of TNT. Convert moment magnitude to joules, ergs or tons, kilotons and megatons of…
Free · Runs in your browser
Electric dipole moment converter
One debye is 3.33564095198 × 10⁻³⁰ coulomb metres. Convert dipole moments between coulomb metres, coulomb centimetres, debye, millidebye, atomic units…
Free · Runs in your browser
Electronvolts to joules converter
One electronvolt is exactly 1.602176634 × 10⁻¹⁹ joules. Enter an energy in eV and get joules with that fixed factor instead of a rounded shortcut, so atomic…
Free · Runs in your browser
Energy density converter
One watt-hour per litre equals 3.6 million joules per cubic metre. Convert energy per volume between eleven units, from J/m³ and Wh/L to kWh/m³ and BTU/ft³, for…
Free · Runs in your browser
EV efficiency converter
Read any EV efficiency figure in the unit you know: 250 Wh/mi from a US dashboard is 4 mi/kWh or 25 kWh/100mi, and you see all six units at once, worked out…
Free · Runs in your browser
Fahrenheit to Kelvin converter
Get the kelvin value of any Fahrenheit reading for physics or chemistry work: 32 °F, where water freezes, is exactly 273.15 K, and -459.67 °F is absolute zero.
Free · Runs in your browser
Feet to inches converter
Multiply by exactly 12 to turn feet into inches: 6 ft is 72 in, the same exact definition used on tape measures, building plans and school worksheets.
Free · Runs in your browser
Feet to yards converter
Divide by exactly 3 to turn feet into yards: 9 ft is 3 yd, with no rough mental shortcut. Handy for football field markings, fabric orders, golf yardages and…
Free · Runs in your browser
Jansky flux density converter
Switch spectral flux density between radio-astronomy and physics units: 1 Jy is exactly 10⁻²⁶ W/m²/Hz, and every answer also shows millijansky, microjansky and…
Free · Runs in your browser
Fracture toughness converter
Put fracture toughness from any datasheet into the unit you need: 50 MPa·√m is about 45.502 ksi·√in, using the exact inch and the exact pascal-per-ksi factor…
Free · Runs in your browser
Gallons to liters converter
One US liquid gallon is exactly 3.785411784 liters, so a 5-gallon drum holds 18.92705892 liters. Use it when a pump, a jug or a bulk container speaks gallons…
Free · Runs in your browser
Gbps to Mbps converter
One gigabit per second is exactly 1000 megabits per second, so a 10 Gbps uplink reads as 10000 Mbps on a plan card or a capacity sheet.
Free · Runs in your browser
Gemstone carat & point converter
One metric carat is exactly 100 points or 0.2 grams, and this converter moves a stone's weight between carats, points, grams, grains and milligrams in any…
Free · Runs in your browser
GPM to LPM converter
One US gallon per minute is exactly 3.785411784 liters per minute, so a 10 GPM pump moves 37.85411784 LPM.
Free · Runs in your browser
Grams to carats converter
One gram is exactly 5 metric carats, because the carat has been fixed at 0.2 grams since 1907. Turn a balance reading in grams into the carat weight that gem…
Free · Runs in your browser
Hectares to square km converter
100 hectares make exactly 1 square kilometre, and a single hectare is 0.01 km². Turn farm, forest and survey totals into the square kilometres used in atlases…
Free · Runs in your browser
Hounsfield unit converter
On the Hounsfield scale water is 0 HU and air about -1000, so 1000 HU means twice the attenuation of water, a relative density of 2.
Free · Runs in your browser
Hz to RPM converter
50 Hz is 3,000 RPM: multiply hertz by exactly 60 to get the revolutions per minute shown on motor nameplates, tachometers, CNC spindles and generator…
Free · Runs in your browser
Inches to feet converter
36 inches is exactly 3 feet: turn a tape-measure reading in inches into the feet used on US construction drawings, room dimensions, furniture catalogs and…
Free · Runs in your browser
Inches to mm converter
1 inch is exactly 25.4 mm and 12 inches is 304.8 mm: turn bolt lengths, hole diameters, sheet thickness or model dimensions into millimetres for ISO drawings…
Free · Runs in your browser
inHg to mb converter
1 inHg is 33.86389 millibars: turn an altimeter setting, a US weather report or a manometer reading in inches of mercury into the millibars used on METAR…
Free · Runs in your browser
Joules to kWh converter
3,600,000 joules is exactly 1 kWh: turn a lab, battery or energy-balance figure in joules into the kilowatt-hours printed on utility bills and capacity sheets…
Free · Runs in your browser
kcal to kJ converter
1 kcal is exactly 4.184 kJ: turn the kilocalories on a US food label, a fitness tracker or a nutrition problem into the kilojoules printed on European packaging…
Free · Runs in your browser
Kelvin to Celsius converter
273.15 K is exactly 0 °C: subtract 273.15 from a kelvin reading taken from a sensor, an ideal-gas problem or a physics table and get the Celsius figure used on…
Free · Runs in your browser
Kelvin to Fahrenheit converter
273.15 K is exactly 32 °F: turn an absolute temperature from a physics lab, a cryogenics sheet or an SI datasheet into the Fahrenheit used for US weather, ovens…
Free · Runs in your browser
KG to lbs converter
1 kg is 2.204622621849 lb: turn a metric scale, clinic or shipping weight into the pounds used on US labels, gym plates and freight quotes, with the exact pound…
Free · Runs in your browser
Km/h to mph converter
Turn a speed in km/h into miles per hour with the exact mile: 1 km/h is 0.621371192237 mph, because a mile is exactly 1609.344 m.
Free · Runs in your browser
Knitting needle size converter
Match knitting needle sizes across millimeter, US, old UK and Japanese labels: US 8 is 5 mm, the same needle as UK 6.
Free · Runs in your browser
Knots to meters per second
Convert a speed in knots to meters per second with the exact factor 1852 divided by 3600: 1 knot is 0.514444444444 m/s.
Free · Runs in your browser
kPa to PSI converter
Convert a kPa reading into psi for tyre gauges, HVAC nameplates and hydraulic benches, with the full factor: 1 kPa is 0.14503773773 psi, not a rounded 0.145…
Free · Runs in your browser
kW to BTU/h converter
Turn a heat pump, boiler or air-conditioner rating in kilowatts into the BTU per hour on US HVAC datasheets: 1 kW is 3412.141633127942 BTU/h, based on the…
Free · Runs in your browser
kWh to joules converter
Multiply kilowatt-hours by exactly 3600000 and get joules: 1 kWh, a 1 kW appliance running for one hour, is 3600000 J.
Free · Runs in your browser
Lbs to kg converter
Multiply pounds by exactly 0.45359237 and get kilograms for body-weight charts, shipping labels and export forms: 1 lb is 0.45359237 kg, with no rounded…
Free · Runs in your browser
Lbs to stone converter
Divide pounds by exactly 14 and get stone: 168 lb is 12 stone, the way body weight is still said in the UK and Ireland.
Free · Runs in your browser
Light-years to km converter
One light-year is exactly 9,460,730,472,580.8 kilometers, and this converter multiplies by that full figure instead of the rounded 9.46 × 10¹², so star…
Free · Runs in your browser
Liters to cubic feet converter
Compare a metric volume with a North American spec sheet: 1 liter is 0.035314666721 cubic feet, because one cubic foot holds exactly 28.316846592 liters under…
Free · Runs in your browser
Liters to gallons converter
Put a metric volume into US liquid gallons without guessing: 1 liter is 0.264172052358 gallons, because one US gallon is exactly 3.785411784 liters.
Free · Runs in your browser
Mach to mph converter
Turn a Mach readout into the miles per hour US readers expect: Mach 1 is 761.215998568361 mph at the sea-level standard atmosphere, from a fixed 340.294 m/s…
Free · Runs in your browser
Mass attenuation coefficient converter
Move μ/ρ values between radiology tables and SI reports: 0.2 cm²/g is 0.02 m²/kg. Nine area-per-mass units, including mm²/g and ft²/lb, for X-ray attenuation…
Free · Runs in your browser
Mbps to Gbps converter
1000 Mbps is exactly 1 Gbps, and a 100 Mbps plan is 0.1 Gbps. Enter a speed in megabits per second and get the gigabit figure used on switchports, fibre…
Free · Runs in your browser
Megabits to megabytes converter
8 megabits are exactly 1 megabyte, and 1 megabit is 0.125 megabytes. Enter a quantity in megabits and get the megabyte figure your file manager shows, without…
Free · Runs in your browser
Megapixel resolution converter
4000 × 3000 pixels make exactly 12 megapixels, and 12 megapixels are 12,000,000 pixels. Switch between megapixels, pixels, kilopixels, gigapixels and width ×…
Free · Runs in your browser
Meters per second to km/h
10 m/s is exactly 36 km/h, because an hour has 3600 seconds and a kilometer 1000 meters. Paste a reading from a lab, a weather model or a car log and get the…
Free · Runs in your browser
Meters to feet converter
100 meters are about 328 feet, worked out by dividing by exactly 0.3048 rather than multiplying by a rounded 3.28.
Free · Runs in your browser
Metric HP to kW converter
100 PS is exactly 73.549875 kW. Type a metric horsepower rating from a European engine plate, a DIN table or a vehicle brochure and get kilowatts and watts…
Free · Runs in your browser
Metric tons to kg converter
2.5 metric tons are exactly 2500 kg. Turn tonne totals from a bill of lading, a commodity contract or a European freight label into the kilograms your warehouse…
Free · Runs in your browser
Color temperature mired converter
Move between kelvin and the mired scale used for filters: 5600 K daylight is about 178.57 mired, or 17.857 decamired.
Free · Runs in your browser
mmHg to atm converter
Divide a mercury-column reading by exactly 760 to get standard atmospheres: 760 mmHg is 1 atm and 1 mmHg is 0.001315789474 atm.
Free · Runs in your browser
Molality converter
Switch a molal concentration between mol/kg, mmol/kg, µmol/kg and mol/g: 1 mol/kg is 1000 mmol/kg and 1 mol/g is 1000 mol/kg.
Free · Runs in your browser
Molar enthalpy converter
Convert molar enthalpy between J/mol, kJ/mol, cal/mol, kcal/mol and BTU per pound-mole: 1 kcal/mol is exactly 4184 J/mol.
Free · Runs in your browser
MPG to km/L converter
Turn a US fuel-economy sticker into kilometers per liter: 30 US MPG is 12.754311222908 km/L, worked out from the exact mile and US gallon instead of a rounded…
Free · Runs in your browser
Mph to km/h converter
Turn a speed in miles per hour into kilometers per hour with the exact factor: 1 mph is 1.609344 km/h, fixed by the legal length of the mile, so road limits and…
Free · Runs in your browser
Mph to knots converter
Bring a road or wind speed into the unit used at sea and in the air: 1 mph is 0.868976241901 knots, taken from the exact 1609.344-meter mile and 1852-meter…
Free · Runs in your browser
Mph to meters per second
Put a road or wind speed into the SI unit physics uses: 1 mph is exactly 0.44704 m/s, because a mile is 1609.344 meters and an hour is 3600 seconds, so 60 mph…
Free · Runs in your browser
Nautical miles to miles converter
Bring a sea or air distance onto the road map: 1 nautical mile is 1.150779448024 statute miles, worked out from the 1852-meter nautical mile and the…
Free · Runs in your browser
Newton-meters to foot-pounds converter
Read a metric torque spec against a US tool chart: 1 newton-meter is 0.737562149277 foot-pounds, found by dividing by the exact 1.3558179483314004 rather than…
Free · Runs in your browser