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.

• Compound +/-200 mb g pressure transmitter with 1/2 BSPT
• Bi-directional -20 to +100 Pa clean room air diff pressure transmitter
• 20 Pa DP range 0-10V output air pressure sensor for building management use
• TSA Precision Pressure Transmitter

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 wire 4 to 20mA pressure transmitter to measure 100 mbar
• Using 25 mbar DP sensor on vacuum below 0.2 bar absolute
• Four cleanroom zones monitoring system to measure overpressure, temperature & humidity
• Bi-directional -20 to +100 Pa clean room air diff pressure transmitter

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

• LEX1 (Ei) High Accuracy Digital Pressure Gauge
• ATEX approved negative 10 mbar vacuum pressure transmitter
• DMP331P Hygienic Flush Pressure Transmitter
• 20 Pa DP range 0-10V output air pressure sensor for building management use

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

• Trichloroethylene compatible 100 mbar Ex pressure transmitter
• 0-50 mbarg 4-20 mA output natural gas monitoring pressure sensor
• Natural gas booster pump inlet/outlet pressure transmitters for backup power generators
• TM Silicon Strain Gauge Pressure Transducer

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