oz/in² – Ounce per Square Inch Pressure Unit

Ounce or Ounce Force per Square Inch is a low pressure unit which is part of the British and American system of units. 1 ounce per square inch equals 430.922 pascals.

The ozf/in² is used mostly for very low pressure rated equipment such as breather valves or controllers for LP natural gas appliances.

There are exactly 16 oz/in² in 1 psi which duplicates the relationship between pounds and ounces used to measure mass and weight.

To convert 1 oz/in² into other pressure units please use the list of conversion factors below.

Click on a pressure unit link to obtain the equivalent oz/in² conversion value.

To convert different different values of ozf/in² please use our on page pressure calculator.

See how oz/in² are derived from SI units and check whether a unit matches one of the versions of identifying oz/in2.

• 40 inH2O g OEM pressure transmitter with 4-20mA current output
• ATEX rated room ±100 Pa differential pressure transmitter
• Industrial powder duct pressure transmitter with +/-15 kPa range
• 41X High Precision Low Range Pressure Transmitter

Request info on low pressure measurement products for your application.

Conversion Factors

• 0.00430922 bar
• 0.0625 psi
• 4.30922 mbar
• 430.922 N/m²
• 430.922 Pa
• 4.30922 hPa
• 0.430922 kPa
• 0.000430922 MPa
• 0.00439418 kg/cm²
• 43.9418 mmH2O 4°C (39.2°F)
• 4.39418 cmH2O 4°C (39.2°F)
• 0.0439418 mH2O 4°C (39.2°F)
• 1.72999 inH2O 4°C (39.2°F)
• 0.144166 ftH2O 4°C (39.2°F)
• 3.23218 mmHg 0°C (32°F)
• 0.323218 cmHg 0°C (32°F)
• 0.127251 inHg 0°C (32°F)
• 3.23218 Torr
• 3232.18 mTorr
• 0.00425287 atm
• 0.00439418 at
• 4309.22 dyn/cm²
• 1 oz/in²
• 3232.18 µHg 0°C (32°F)
• 0.0000279018 tsi (uk, long)
• 0.00003125 tsi (usa, short)
• 0.0045 tsf (usa, short)
• 9 psf
• 4.39418 g/cm²

Please note that the conversion factors above are accurate to 6 significant figures.

• 3 psig range 4-20mA output natural gas pressure sensor for building boiler heating use
• ATEX approved negative 10 mbar vacuum pressure transmitter
• Argon gas pressure sensor for 0-20mbar above atmospheric pressure
• LEO Record (Ei) Capo Low Pressure Logger

Request info on low pressure measurement products for your application.

Derivation

The calculation below shows how the pressure unit Ounce per Square Inch (oz/in²) is derived from SI Units.

Formula

• Pressure = Force / Area
• Force = Mass x Acceleration
• Acceleration = Distance / (Second x Second)

SI Units

• Mass: kilogram (kg)
• Length: metre (m)
• Time: second (s)
• Force: newton (N)
• Pressure: pascal (Pa)

Input Values

• 1 Ounce = 0.02834952313 kg
• 1 Inch = 0.0254 m
• 1 Square Inch = 0.0254 m x 0.0254 m = 0.00064516 m²
• Acceleration = Standard Gravity = 9.80665 m/s²

Calculation

• 1 Ounce Force = 0.02834952313 kg x 9.80665 m/s² = 0.278013851 N
• 1 oz/in² Pressure = 0.278013851 N / 0.00064516 m² = 430.9223309 Pa

• 40 mbar range pressure to current transmitter
• DPS300 User Switchable Pressure Range, Volts or Current Output Low DP Sensor
• 40 inH2O g peak/valley storing pressure gauge for monitoring gas feed fluctuations
• Low Pressure Range Intrinsically Safe Pressure Transmitters

Request info on low pressure measurement products for your application.

Alternate Descriptions

These are the different versions used for identifying oz/in² that you may find elsewhere.

• Ounce per Square Inch
• Ounce Force per Square Inch
• Ounces per Square Inch
• Ounces Force per Square Inch
• oz/in²
• ozf/in²
• oz/in^2
• ozf/in^2
• oz/sq in
• ozf/sq in

Conversion Tables

Select a look up table for converting a pressure reading in ounces force per square inch to other measurement units.

• psi  »  0.1 to 2000 oz/in² → 0.0625 to 125.000 psi

• Baroli 02P Low Range Flush Diaphragm Digital Pressure Gauge
• 0-100Pa air pressure transducer with a 0-10V analog output
• Low Range Pressure Gauges
• Standby generator 20inH2Og range 0-5Vdc output natural gas and propane pressure sensor

Request info on low pressure measurement products for your application.

Measurement Unit Related Terms

More pages related to measurement unit technical terms.

• at – Technical Atmosphere Pressure Unit
• atm – Standard Atmosphere Pressure Unit
• bar Pressure Unit
• cmH2O – Centimetres of Water Column at 4 deg C Pressure Unit
• cmHg – Centimetres of Mercury at 0 deg C Pressure Unit
• daPa – Dekapascal Pressure Unit
• dyn/cm² – Dyne per Square Centimetre Pressure Unit
• ftH2O – Feet of Water Column at 4 deg C Pressure Unit
• g – Acceleration due to Gravity
• g/cm² – Grams per Square Centimetre Pressure Unit
• hPa – Hectopascal Pressure Unit
• inH2O – Inches of Water Column at 4 deg C Pressure Unit
• inHg – Inches of Mercury at 0 degrees C Pressure Unit
• kg/cm² – Kilogram per Square Centimetre Pressure Unit
• kg/mm² – Kilogram per Square Millimetre Pressure Unit
• kPa – Kilopascal Pressure Unit
• ksi – Kilopounds per Square Inch Pressure Unit
• mbar – Millibar Pressure Unit
• mH2O – Metres of Water Gauge at 4 deg C Pressure Unit
• mmH2O – Millimetres of Water Column at 4 deg C Pressure Unit
• mmHg – Millimetres of Mercury at 0 deg C Pressure Unit
• MPa – Megapascal Pressure Unit
• mPa – Millipascal Pressure Unit
• mTorr – Millitorr Pressure Unit
• N/cm² – Newton per Square Centimetre Pressure Unit
• N/m2 – Newton per Square Metre Pressure Unit
• N/mm² – Newton per Square Millimetre Pressure Unit
• Pa – Pascal Pressure Unit
• Pressure
• Pressure Units
• psf – Pounds per Square Foot Pressure Unit
• psi – Pounds per Square Inch Pressure Unit
• Specific Gravity
• Torr Pressure Unit
• tsf – Tons per Square Foot (USA, Short) Pressure Unit
• tsi – Tons per Square Inch (UK, Long) Pressure Unit
• tsi – Tons per Square Inch (USA, Short) Pressure Unit
• Water Density
• µHg – Micron of Mercury at 0 deg C Pressure Unit