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.
Featured low pressure measurement products
Low Pressure Range Intrinsically Safe Pressure Transmitters - These intrinsically safe pressure transmitters are designed for precise measurement in hazardous areas where low pressure ranges are critical.
DCT531P RS485 Modbus RTU Flush Pressure Sensor - RS485 Modbus RTU serial interface pressure sensor with exposed all welded stainless steel 316L flush diaphragm in ranges from 100mb up to 40 bar gauge or absolute.
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.
Featured low pressure measurement products
+/- 6 psi / 0.4 bar Low Pressure Calibration Pump – ADT901 - The ADT901 low pressure calibration pump is a hand operated pressure pump designed to generate pressures over +/-6 psi (+/-0.4 bar)
Four cleanroom zones monitoring system to measure overpressure, temperature & humidity - We need a system to monitor overpressure, temperature and humidity for a new cleanroom that we will be extending.
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
Featured low pressure measurement products
LEO Record (Ei) Capo Low Pressure Logger - Battery powered data logger for measuring and recording low range pressures. Pressure ranges from 30 mbar (12 inH2O) up to 300 mbar (120 inH2O).
Measuring negative pressure in hospital construction zones with a low range differential pressure transducer - Low-range differential pressure transmitter provides the resolution needed to verify negative pressure in hospital construction vestibules, ensuring containment of dust and airborne contaminants.
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
Featured low pressure measurement products
Trichloroethylene compatible 100 mbar Ex pressure transmitter - Intrinsically safe pressure transmitter with ceramic diaphragm for trichloroethylene compatibility. Ideal for low-pressure measurement in hazardous areas.- +/- 6 psi / 0.4 bar Low Pressure Calibration Pump – ADT901 - The ADT901 low pressure calibration pump is a hand operated pressure pump designed to generate pressures over +/-6 psi (+/-0.4 bar)
Glossary of Low Pressure technical terms
- g Effect
- inH2O – Inches of Water Column at 4 deg C Pressure Unit
- mmH2O – Millimetres of Water Column at 4 deg C Pressure Unit
- Pa – Pascal Pressure Unit
