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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.

Low pressure measurement products
  • DMK351 Liquid and Gas Resistant Intrinsically Safe Low Range Gauge Pressure Sensor
  • Natural gas compatible pressure switch for setting from 5 to 20 mbar
  • DPS Low Differential Pressure Transmitter 0.06 inWG positive air pressure transmitter for HVAC blower fan control
  • Bidirectional -50 to +50 Pa diff pressure transmitter with user calibration adjustment

Request info on low pressure measurement products for your application.

Contents

  • Conversion Factors
  • Derivation
      • Formula
      • SI Units
      • Input Values
      • Calculation
  • Alternate Descriptions
  • Conversion Tables

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.

Low pressure measurement products
  • 40 inH2O g OEM pressure transmitter with 4-20mA current output
  • DPS Low Differential Pressure Transmitter +/- 1 inH2O compound range pressure sensor
  • 20 cmH20 digital manometer with Hi and Lo alarm switch
  • Trichloroethylene compatible 100 mbar Ex pressure transmitter

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
Low pressure measurement products
  • DMK351 Liquid and Gas Resistant Intrinsically Safe Low Range Gauge Pressure Sensor
  • 4 to 20 inWG Adjustable Differential Pressure Switch
  • DPS Low Differential Pressure Transmitter DPS Low Differential Pressure Transmitter
  • 20 inWG Liquid compatible pressure transmitter

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
Low pressure measurement products
  • 5psig 0-10V out freshwater pressure transducer and built-in display for water purifier use
  • DPS Low Differential Pressure Transmitter +/- 1 inH2O compound range pressure sensor
  • 1 inH2O dp range wall mounted HEPA air filter pressure gauge with 4-20mA output
  • 10 mmWC draft fan differential pressure transmitter

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

Primary Sidebar

Measure & Log Pressure On Your Computer

Measure and record pressure in bar, mbar, psi, MPa, Pa, mH2O, mmHg, atm or kg/cm2 using this USB pressure sensor and logging kit with your computer
Measure and record pressure in bar, mbar, psi, MPa, Pa, mH2O, mmHg, atm or kg/cm2 using this USB Pressure Sensor and Logging Kit with your computer

Product Selection Guides

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