21 converter categories covering every physical quantity used in engineering, science, and research. Live results as you type.
21Categories
130+Units
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Common Unit Converters
Common Units
📏
Length
mm · cm · m · km · in · ft · yd · mi · nmi
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⚖️
Mass & Weight
mg · g · kg · t · oz · lb · st
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🌡️
Temperature
°C · °F · K · °R
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⬛
Area
mm² · cm² · m² · km² · in² · ft² · yd² · ac · ha
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🧊
Volume
mL · L · m³ · cm³ · in³ · ft³ · gal · qt · pt · fl oz
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💨
Speed
m/s · km/h · mph · knots · ft/s · Mach
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⏱️
Time
ns · µs · ms · s · min · hr · day · wk · mo · yr
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🍳
Cooking Measurements
tsp · tbsp · cup · fl oz · mL · L · pt · qt
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📄
Paper Sizes
A3 · A4 · A5 · Letter · Legal · Tabloid · B4 · B5
Select a paper size above
Scientific Unit Converters
Scientific Units
⚡
Energy
J · kJ · cal · kcal · Wh · kWh · BTU · eV
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🔵
Pressure
Pa · kPa · MPa · bar · atm · psi · mmHg · inHg
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💪
Force
N · kN · MN · lbf · kgf · dyn
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🚀
Acceleration
m/s² · g · ft/s² · cm/s² · Gal
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〰️
Frequency
Hz · kHz · MHz · GHz · THz · rpm · rad/s
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🪨
Density
kg/m³ · g/cm³ · g/L · lb/ft³ · lb/gal
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Engineering Unit Converters
Engineering Units
⚙️
Power
W · kW · MW · hp · BTU/hr · kcal/hr
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🔩
Torque
N·m · kN·m · lbf·ft · lbf·in · kgf·m
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🌊
Flow Rate
m³/s · L/s · L/min · GPM · CFM · m³/hr
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📐
Angle
° · rad · grad · rev · arcmin · arcsec
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💾
Data Storage
bit · B · KB · MB · GB · TB · PB
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⛽
Fuel Consumption
mpg · L/100km · km/L · mi/L
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Frequently Asked Questions
How many feet are in a meter?
1 meter = 3.28084 feet (exactly 1 / 0.3048). A meter is slightly longer than a yard and about 3¼ feet.
What is 100°C in Fahrenheit?
100°C = 212°F — the boiling point of water at sea level. The formula is °F = (°C × 9/5) + 32.
How many kg in a pound?
1 pound (lb) = 0.45359237 kg exactly. Inversely, 1 kg ≈ 2.20462 lb. The pound is defined as exactly 453.59237 grams.
How do you convert PSI to bar?
1 PSI = 0.0689476 bar. Multiply PSI by 0.0689476. Tire pressures in Europe use bar; in the US they use PSI.
What is 1 atmosphere in PSI and kPa?
1 atm = 101.325 kPa = 14.6959 PSI. Standard atmospheric pressure is the baseline for most pressure measurements.
How do I convert Newton-meters to lb-ft?
1 N·m = 0.737562 lbf·ft. Multiply your Newton-meter value by 0.737562 to get pound-feet — commonly needed for engine torque specs.
How many liters per 100km is 30 MPG (US)?
30 US MPG ≈ 7.84 L/100km. Fuel economy is non-linear — use the converter above for all unit combinations.
What is 1 horsepower in watts?
1 metric horsepower (PS) = 735.499 W. 1 electrical horsepower = exactly 746 W. The difference matters for precise engineering work.
How accurate are these conversions?
All factors are based on NIST and SI Brochure 9th edition standards, displayed to 8 significant figures. Always verify results independently for critical applications.
Does this site store any of my data?
No. All calculations happen entirely in your browser. Nothing you type is ever sent to a server. No cookies, no tracking, no accounts required.
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Results are provided for general reference and educational purposes only. Always verify critical calculations independently before use in professional, engineering, medical, or safety-critical applications. Rounding may affect precision at extreme values.