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📏 Unit convertersFree
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…
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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…
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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…
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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…
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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…
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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…
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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…
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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.
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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.
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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.
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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…
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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…
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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.
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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…
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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.
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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…
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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…
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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.
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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…
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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…
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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…
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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…
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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 ×…
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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…
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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.
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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…
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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…
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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.
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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.
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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.
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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.
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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…
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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…
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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…
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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…
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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…
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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…
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Newtons to pounds-force converter
Read an SI force against a US load rating: 1 newton is 0.2248089431 pounds-force, found by dividing by the exact 4.4482216152605 newtons in one pound-force…
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Number density converter
Move a particle count per volume between textbook, lab and datasheet units: 1000000 per cubic meter is exactly 1 per cubic centimeter, and all nine units pass…
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Octave band frequency converter
See a frequency on every log scale at once: 1000 Hz above a 1 Hz reference is exactly 3 decades, about 9.965784284662 octaves and 119.589411415945 semitones…
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Osmolarity converter
Line up a lab panel with a textbook value: 300 mOsm/L is 0.3 Osm/L, and every answer also comes in micro-osmoles per liter and osmoles per cubic meter, using…
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Ounces to cups converter
Turn the fluid ounces on a drink label or measuring cup into recipe cups: 8 fl oz is exactly 1 cup and 16 fl oz is 2 cups, because the US cup is defined as…
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Ounces to grams converter
Turn the ounces on a US package or portion card into grams: 1 ounce is exactly 28.349523125 g and 16 ounces are 453.59237 g, so labels and lab records match…
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Ounces to lbs converter
Move a weight from the ounce scale to pounds for a carrier form or a warehouse manifest: 16 ounces are exactly 1 pound, so the converter divides by 16 with no…
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Particle fluence converter
One particle per square centimetre is 10000 per square metre. Convert fluence between nine units, from per barn and per square fermi to per square inch, always…
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Nominal pipe size converter
A 2-inch pipe, NPS 2, is DN 50 with an outside diameter of 2.375 in, or 60.3 mm. Look up any of the 34 chart sizes by NPS, DN or measured outside diameter…
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Plato & specific gravity converter
12 degrees Plato is a specific gravity of about 1.048, or 48 Oechsle and gravity points. Move between Plato, SG, Brix, Balling, Oechsle and points for wort…
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Pounds-force to newtons converter
One pound-force is exactly 4.448221615261 newtons: the weight of a 0.45359237 kg pound under standard gravity of 9.80665 m/s².
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Pounds to grams converter
One pound is exactly 453.59237 grams, so 2 pounds are 907.18474 g. Turn the pounds on a US package, a scale or a shipping quote into grams for labels, customs…
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PSI to ATM converter
1 psi is 0.06804596391 standard atmospheres, taken from the exact definitions of the atmosphere and the pound-force per square inch.
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PSI to kPa converter
1 psi is 6.894757293168 kPa, so a tyre placard, an air-tool rating or a compressor cut-in setpoint in psi reaches a metric datasheet with the exact figure…
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Quarts to cups converter
Multiply quarts by 4 and you have cups: 1 US liquid quart is exactly 4 cups and 2.5 quarts are 10 cups, so scaling a recipe, a drink batch or a prep sheet takes…
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Radiant intensity converter
Switch power per solid angle between six units: 1 W/sr is 1000 mW/sr, and square-degree values use the exact solid-angle bridge, so laser datasheets…
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Reactive power converter
Convert reactive power ratings with exact SI prefixes: 1 Mvar is exactly 1000 kvar, so transmission bank schedules, nameplates in kvar and capacitor datasheets…
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Magnetic reluctance converter
Convert magnetic reluctance across nine units, from inverse henries and ampere-turns per weber to the CGS gilbert per maxwell: 1 H⁻¹ is exactly 1 At/Wb, so core…
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RPM to Hz converter
Turn a motor, fan or spindle speed in RPM into hertz: 60 RPM is exactly 1 Hz, and you also get revolutions per second, the time of one turn and the angular…
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Shore hardness converter
Translate a durometer reading between seven Shore scales: 70 Shore A is about 29 Shore D, read from a fixed elastomer table with Shore A in the middle, so mixed…
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Square meters to square feet
One square foot is exactly 0.09290304 m², so 1 m² comes to 10.76391041671 ft². Turn a floor plan, a room or a lot from square metres into the square feet used…
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Square miles to acres converter
One square mile is exactly 640 acres, not the rough 600 of mental shortcuts. Convert county, park, ranch or wildfire areas from square miles into the acres used…
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Surface density converter
2.5 kg/m² is 73.733811704108 oz/yd². Convert mass per area between kg/m², gsm, g/cm², mg/m², and ounces or pounds per square yard or foot for coating sheets…
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