# 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.

oz/in² Pressure 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) 2.79018e-05 tsi (uk, long) 3.125e-05 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.

oz/in² 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

oz/in² 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

tel: +44 (0)844 800 9440

Save
Tools

Pressure Conversion

Converts to

IP Ratings Explained

I P

First Digit (Solids)
No protection

Second Digit (Liquids)
No protection

Temperature Conversion

Converts to

Reference
Specify
Articles