Length & Distance29
Meter to Feet
1 m = 3.280839895 ft · 19 length units
Feet to Meter
1 ft = 0.3048 m · 19 length units
Inch to CM
1 in = 2.54 cm · 19 length units
CM to Inch
1 cm = 0.39370079 in · 19 length units
KM to Mile
1 km = 0.62137119 mi · 19 length units
Mile to KM
1 mi = 1.609344 km · 19 length units
Yard to Meter
1 yd = 0.9144 m · 19 length units
Meter to Yard
1 m = 1.093613298 yd · 19 length units
MM to Inch
1 mm = 0.039370079 in · 19 length units
Inch to MM
1 in = 25.4 mm · 19 length units
Nautical Mile to KM
1 nmi = 1.852 km · 19 length units
KM to Nautical Mile
1 km = 0.5399568 nmi · 19 length units
Light Year Converter
1 ly = 9,460,730,472,580.8 km · 19 length units
Angstrom Converter
1 Å = 0.1 nm · 19 length units
Square Feet Converter
1 ft² = 0.09290304 m² · 16 area units
Square Meter Converter
1 m² = 10.76391042 ft² · 16 area units
Square Mile Converter
1 mi² = 2.58998811 km² · 16 area units
Square Yard Converter
1 yd² = 0.83612736 m² · 16 area units
Square Inch Converter
1 in² = 6.4516 cm² · 16 area units
Square KM Converter
1 km² = 0.38610216 mi² · 16 area units
Cubic Meter Converter
1 m³ = 35.31466672 ft³ · 19 volume units
Cubic Feet Converter
1 ft³ = 0.028316847 m³ · 19 volume units
Meters per Second Converter
1 m/s = 3.6 km/h · 7 speed units
Feet per Second Converter
1 ft/s = 0.68181818 mph · 7 speed units
Gallon per Mile Converter
gal/100mi ↔ L/100km · 6 fuel economy units
Liters per 100KM Converter
L/100km ↔ mpg (US) · 6 fuel economy units
Miles per Gallon Converter
mpg (US) ↔ L/100km · 6 fuel economy units
Length Converter
1 m = 3.280839895 ft · 19 length units
Kilometers per Liter Converter
km/L ↔ mpg (US) · 6 fuel economy units
Weight & Mass15
KG to Pound
1 kg = 2.204622622 lb · 13 mass units
Pound to KG
1 lb = 0.45359237 kg · 13 mass units
Gram to Ounce
1 g = 0.035273962 oz · 13 mass units
Ounce to Gram
1 oz = 28.34952313 g · 13 mass units
Ton to KG
1 t = 1000 kg · 13 mass units
KG to Ton
1 kg = 0.001 t · 13 mass units
Stone to KG
1 st = 6.35029318 kg · 13 mass units
MG to Gram
1 mg = 0.001 g · 13 mass units
Microgram Converter
1 µg = 0.001 mg · 13 mass units
Carat Converter
1 ct = 0.2 g · 13 mass units
Fluid Ounce Converter
1 fl oz = 29.57352956 mL · 19 volume units
Newton Converter
1 N = 0.22480894 lbf · 7 force units
Pound Force Converter
1 lbf = 4.448221615 N · 7 force units
Mass Flow Rate Converter
1 kg/s = 2.204622622 lb/s · 6 mass flow rate units
Weight Converter
1 kg = 2.204622622 lb · 13 mass units
Temperature6
Area6
Acre Converter
1 acre = 4046.856422 m² · 16 area units
Hectare Converter
1 ha = 2.471053815 acre · 16 area units
Bigha Converter
1 bigha = 0.33057847 acre · 16 area units
Guntha Converter
1 guntha = 101.17141 m² · 16 area units
Kanal Converter
1 kanal = 505.857 m² · 16 area units
Concentration Converter
1 ppm = 0.0001 % · 6 concentration units
Volume & Cooking11
Liter Converter
1 L = 0.26417205 gal · 19 volume units
Gallon Converter
1 gal = 3.785411784 L · 19 volume units
Milliliter Converter
1 mL = 0.033814023 fl oz · 19 volume units
Cup Converter
1 cup = 236.5882365 mL · 19 volume units
Pint Converter
1 pt = 473.176473 mL · 19 volume units
Quart Converter
1 qt = 0.94635295 L · 19 volume units
Tablespoon Converter
1 tbsp = 14.78676478 mL · 19 volume units
Teaspoon Converter
1 tsp = 4.928921594 mL · 19 volume units
Barrel Converter
1 bbl = 158.9872949 L · 19 volume units
Specific Volume Converter
1 m³/kg = 16.01846352 ft³/lb · 4 specific volume units
Volume Converter
1 L = 0.26417205 gal · 19 volume units
Speed, Time & Fuel18
KM/H to MPH
1 km/h = 0.62137119 mph · 7 speed units
MPH to KM/H
1 mph = 1.609344 km/h · 7 speed units
Knot Converter
1 kn = 1.852 km/h · 7 speed units
Mach Number Converter
1 Mach = 1225.044 km/h · 7 speed units
Speed of Light Converter
1 c = 1,079,252,848.8 km/h · 7 speed units
Seconds Converter
1 s = 0.016666667 min · 11 time units
Minutes Converter
1 min = 0.016666667 h · 11 time units
Hours Converter
1 h = 0.041666667 d · 11 time units
Days Converter
1 d = 0.14285714 wk · 11 time units
Weeks Converter
1 wk = 7 d · 11 time units
Months Converter
1 mo = 30.436875 d · 11 time units
Years Converter
1 yr = 365.2425 d · 11 time units
Milliseconds Converter
1 ms = 0.001 s · 11 time units
Microseconds Converter
1 µs = 0.001 ms · 11 time units
Nanoseconds Converter
1 ns = 0.001 µs · 11 time units
Kilowatt Hour Converter
1 kWh = 3.6 MJ · 12 energy units
Radians per Second Converter
1 rad/s = 9.549296586 rpm · 7 frequency units
Fuel Economy Converter
L/100km ↔ mpg (US) · 6 fuel economy units
Data & Computing9
Data Storage Converter
1 GB = 1000 MB · 11 data units
Byte to KB
1 B = 0.001 kB · 11 data units
KB to MB
1 kB = 0.001 MB · 11 data units
MB to GB
1 MB = 0.001 GB · 11 data units
GB to TB
1 GB = 0.001 TB · 11 data units
Bit to Byte Converter
1 b = 0.125 B · 11 data units
Kibibyte Converter
1 KiB = 1.024 kB · 11 data units
Mebibyte Converter
1 MiB = 1.048576 MB · 11 data units
Heat Transfer Coefficient Converter
1 W/(m²·K) = 0.17611019 BTU/(h·ft²·°F) · 3 heat transfer coefficient units
Energy, Power & Electrical10
Joule Converter
1 J = 0.23900574 cal · 12 energy units
Calorie Converter
1 cal = 4.184 J · 12 energy units
Kilocalorie Converter
1 kcal = 4.184 kJ · 12 energy units
BTU Converter
1 BTU = 1.055055853 kJ · 12 energy units
Electron Volt Converter
1 eV = 1.602177e-19 J · 12 energy units
Watt Converter
1 W = 0.0013410221 hp · 9 power units
Horsepower Converter
1 hp = 0.74569987 kW · 9 power units
Kilowatt Converter
1 kW = 1.34102209 hp · 9 power units
Electric Field Converter
1 V/m = 0.001 kV/m · 5 electric field strength units
Voltage Converter
1 V = 0.001 kV · 5 voltage units
Pressure & Force8
PSI Converter
1 psi = 0.068947573 bar · 12 pressure units
Bar Converter
1 bar = 14.50377377 psi · 12 pressure units
Pascal Converter
1 Pa = 0.00001 bar · 12 pressure units
Atmosphere Converter
1 atm = 101.325 kPa · 12 pressure units
Torr Converter
1 Torr = 0.13332237 kPa · 12 pressure units
mmHg Converter
1 mmHg = 0.13332239 kPa · 12 pressure units
Dyne Converter
1 dyn = 0.00001 N · 7 force units
Torque Converter
1 N·m = 0.73756215 lbf·ft · 8 torque units
Angle, Frequency & Other38
Fathom Converter
1 fathom = 1.8288 m · 19 length units
Furlong Converter
1 furlong = 201.168 m · 19 length units
Grain Converter
1 gr = 0.06479891 g · 13 mass units
Delisle Converter
°De ↔ °C · 7 temperature units
Biswa Converter
1 biswa = 66.8902 m² · 16 area units
KPA Converter
1 kPa = 0.14503774 psi · 12 pressure units
Hertz Converter
1 Hz = 0.001 kHz · 7 frequency units
Kilohertz Converter
1 kHz = 0.001 MHz · 7 frequency units
Megahertz Converter
1 MHz = 0.001 GHz · 7 frequency units
Gigahertz Converter
1 GHz = 1000 MHz · 7 frequency units
RPM Converter
1 rpm = 0.016666667 Hz · 7 frequency units
Degree Converter
1 ° = 0.017453293 rad · 7 angle units
Radian Converter
1 rad = 57.29577951 ° · 7 angle units
Grad Converter
1 grad = 0.9 ° · 7 angle units
Angle Converter
1 ° = 0.017453293 rad · 7 angle units
Solid Angle Converter
1 sr = 3282.80635 deg² · 4 solid angle units
Luminance Converter
1 cd/m² = 0.29186351 fL · 5 luminance units
Illuminance Converter
1 lx = 0.09290304 fc · 5 illuminance units
Magnetic Field Converter
1 T = 10000 G · 6 magnetic flux density units
Resistance Converter
1 Ω = 0.001 kΩ · 5 electrical resistance units
Conductance Converter
1 S = 1000 mS · 5 electrical conductance units
Capacitance Converter
1 µF = 1000 nF · 5 capacitance units
Inductance Converter
1 mH = 1000 µH · 4 inductance units
Current Converter
1 A = 1000 mA · 4 electric current units
Charge Converter
1 C = 0.27777778 mAh · 8 electric charge units
Magnetic Flux Converter
1 Wb = 100,000,000 Mx · 5 magnetic flux units
Radioactivity Converter
1 Bq = 2.702703e-11 Ci · 8 radioactivity units
Absorbed Dose Converter
1 Gy = 100 rad · 5 absorbed dose units
Equivalent Dose Converter
1 Sv = 100 rem · 5 equivalent dose units
Density Converter
1 kg/m³ = 0.001 g/cm³ · 7 density units
Viscosity Converter
1 Pa·s = 1000 cP · 5 dynamic viscosity units
Surface Tension Converter
1 N/m = 1000 dyn/cm · 4 surface tension units
Thermal Conductivity Converter
1 W/(m·K) = 0.57778921 BTU/(h·ft·°F) · 4 thermal conductivity units
Flow Rate Converter
1 L/s = 15.85032314 GPM · 8 volumetric flow rate units
Molarity Converter
1 mol/L = 1000 mmol/L · 5 molar concentration units
Molality Converter
1 mol/kg = 1000 mmol/kg · 4 molality units
Parts Per Million Converter
1 ppm = 1000 ppb · 6 concentration units
Acceleration Converter
1 m/s² = 0.10197162 g · 7 acceleration units
What the unit converters cover
There are 150 converter pages here, one per common pair, grouped by quantity: length (metres and feet, inches and centimetres, kilometres and miles), mass (kilograms and pounds, grams and ounces), temperature (Celsius, Fahrenheit and Kelvin), area, volume, speed, data storage, time, pressure, energy, power, frequency, angle and fuel economy, including regional land units such as bigha, guntha and kanal.
Every factor is the defined one, not a textbook approximation. The inch has been exactly 25.4 mm since the 1959 international agreement; the mile is exactly 1.609344 km; where a unit depends on a measured constant, the current CODATA or IAU value is used. Each page states the factor it applies and lets you pick any pair within the same quantity from the dropdowns, so the 150 pages are entry points into one consistent table rather than 150 separate tools.
Two cases that are not simple multiplication
- Temperature scales have different zero points, so Celsius to Fahrenheit is a scale plus an offset. You cannot convert a temperature difference with the same formula you use for a temperature.
- Fuel economy in litres per 100 km and miles per gallon are reciprocals, and the US and imperial gallons are different sizes. Halving one does not halve the other.
- Convert once from the original figure. Chaining conversions compounds rounding.