Engineering Unit Conversion
Input a value into any field to automatically calculate all other parameters.
Length
Area
Volume
Temperature
Weight & Force
Pressure & Vacuum
Air Flow
Water Flow
Air Changes per Hour (ACH)
Input room dimensions and airflow to calculate the ACH.
Derived SI Units (Special names)
| Quantity | Unit | Symbol | Derivation |
|---|---|---|---|
| Electrical potential | volt | V | W/A |
| Energy | joule | J | N.m |
| Force | newton | N | kg.m/s² |
| Frequency | hertz | Hz | s-1 |
| Heat flow rate | watt | W | J/s |
| Heat quantity | joule | J | N.m |
| Power | watt | W | J/s |
| Pressure | pascal | Pa | N/m² |
| Temperature | degree Celsius | °C | °C = K - 273.15 |
| Temperature interval | degree Kelvin/Celsius | °C | 1K = 1°C |
| Work | joule | J | N.m |
Derived SI Units (Complex Names)
| Acceleration | metre per second squared | m/s² |
| Angular velocity | radian per second | rad/s |
| Area | square metre | m² |
| Calorific value | joule per cubic metre | J/m³ |
| Density | kilogram per cubic metre | kg/m³ |
| Intensity of heat flow | watt per square metre | W/m² |
| Thermal conductance | watt per square metre degree Kelvin | W/m².K |
| Thermal conductivity | watt per metre degree Kelvin | W/m.K |
| Thermal resistance | square metre degree Kelvin per watt | m².K/W |
| Thermal resistivity | metre degree Celsius per watt | m.K/W |
| Torque | newton metre | N.m |
| Velocity (speed) | metre per second | m/s |
| Volume | cubic metre | m³ |
| Volume rate of flow | cubic metre per second | m³/s |
| Water vapour permeability | microgram metre per newton second | μg.m/N.s |
| Water vapour permeance | microgram per newton second | μg/N.s |
Metric conversion
| Length |
1 inch=25.4mm (exactly)
1 mile=1.609km
|
1m=39.37 inch
1km=0.6215 mile
|
| Mass |
1 grain=0.0648 gram
1 ounce=28.35 gram
1 Troy ounce=31.1 gram
1 pound=0.454kg
1 tonne=1000kg
1 ton=1.016 tonne
|
1 gram=15.4 grains
1 gram=0.03527 ounces
1kg=2.20 pounds
1 tonne=0.984 ton
|
| Area |
1in²=645mm²
1ft²=0.0929m²
1 acre=0.405 ha
1 acre=4047m²
|
1mm²=0.00155in²
1m²=10.76ft²
1ha=2.47 acre
|
| Volume (solids) |
1in³=16387mm³
|
1m³=35.3ft³
1m³=1.31 yards³
|
| Volume (liquids and gases) |
1 fluid ounce=28.4 mL
1 pint=0.568 L
1 imperial gal.=4.55 L
1 U S gallon (8lb water)=3.785 L
1 imperial gallon (10lb water)=1.20 US gal.
|
1mL=0.0352 fluid ounce
1 Litre=61.02in³
1 Litre=1.76 pints
1 Litre=0.220 imperial gal.
1 Litre=0.264 US gal.
|
| Viscosity |
1lbf.s/ft²=47.88026 N.s/m²
|
1N.s/m²=0.020885lbf.s/ft²
|
| Velocity |
1ft/s=0.3048m/s
1ft/min=0.00508m/s
1 mile/hr=1.61km/hr
|
1m/s=3.28ft/s
1m/s=196.8fpm
1km/hr=0.621mph
|
| Pressure |
1psi=6.89kPa
1in H2O=249Pa
1mm H2O=9.81Pa
1 metre H2O=9.81kPa
1in Hg=3.39kPa
1mm Hg=1 Torr
1mm Hg=133.3Pa
1bar=100kPa
1 Std. Atmos.=101.325kPa
1 Std. Atmos.=760mm Hg Absolute
1 kgf/cm²=98.7kPa
|
1kPa=0.145psi
1kPa=20.9lb/ft²
1kPa=4.014in Hg
1kPa=0.335ft H2O
1kPa=102mm H2O
1kPa=0.295in Hg
1kPa=7.502mm Hg
1kPa=0.01 bar
|
| Power and heat flow rate |
1 (Imperial) HP=746 W
1 (Metric) HP=735.5 W
1 Boiler HP=9.81kW
1BTU/hr=0.293 W
1k cal/hr=1.163 W
1ton refrig.=3.517kW
1MJ/hr=278 W
|
1kW=1.34 HP
1(Metric)HP=0.986 (Imperial) HP
1kW=3415 BTU/hr
1W=0.860k cal/hr
1kW=0.284 ton refrig.
1kW=3.6 MJ/hr
|
| Conductivity (k) |
1BTU in/hr.ft².°F=0.144 W/m K
|
1W/m K=6.93BTU in /hr ft² °F
|
| Conductance (c) |
1BTU/hr.ft².°F=5.68 W/m² K
|
1W/m² K=0.176BTU/hr ft² °F
|
| Flow rate (mass) |
1lb/min=0.00756 kg/s
1lb/hr=0.00013 kg/s
|
1kg/s=132lb/min
1kg/s=7936lb/hr
|
| Flow rate (volume) |
1 CFM=0.472L/s
1 imperial gpm=0.076L/s
1 US gpm=0.0631L/s
|
1L/s=2.12CFM
1L/s=13.2 imperial gpm
1L/s=15.8 US gpm
|
| Enthalpy difference |
1BTU/lb=2.326kJ/kg
|
1kJ/kg=0.430BTU/lb
|
| Specific heat capacity |
1BTU/lb °F=4.187kJ/kg K
|
1kJ/kg K=0.239BTU/lb °F
|
| Intensity of heat flow rate |
1BTU/hr ft²=3.155W/m²
|
1W/m²=0.317BTU/hr ft²
|
| Calorific value |
1BTU/lb=2.33kJ/kg
1BTU/ft³=37.3kJ/m³
|
1kJ/kg=0.430BTU/lb
1kJ/m³=0.026BTU/ft³
|
| Moisture content |
1grain/lb=0.143 gram/kg
|
1gram/kg=7.0 grain/lb
|
| Specific volume |
1ft³/lb=0.0624m³/kg
|
1m³/kg=16.02ft³/lb
|
| Density |
1lb/ft³=16.02 g/m³
|
1kg/m³=0.0624lb/ft³
|
| Torque |
1lbf ft=1.356Nm
|
1Nm=0.7376lbf ft
|
| Energy |
1BTU=1.06kJ
1therm=106MJ
|
1kJ=0.948BTU
1MJ=0.00948 therm
1kWh=3.6 MJ
|
| Thermal resistance |
1ft².hr °F/BTU=176.1m²K/kW
|
1m²K/kW=0.00568 ft². hr °F/BTU
|
| Fin spacing |
5 Fins / inch=5.08mm Fin pitch = 197 Fins / metre
6 Fins / inch=4.23mm Fin pitch = 234 Fins / metre
8 Fins / inch=3.17mm Fin pitch = 314 Fins / metre
10 Fins / inch=2.54mm Fin pitch = 394 Fins / metre
12 Fins / inch=2.12mm Fin pitch = 472 Fins / metre
14 Fins / inch=1.81mm Fin pitch = 551 Fins / metre
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1 micron = 10-6 m
1 angstrom unit = 10-10 m
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