Suction Pressure to Vacuum Calculator

Barometric & Suction Values
Pbaro [?]
⟳ Select barometric unit mbar inHg 0°C mmHg 0°C Torr psi hPa kPa bar Pa hPa kPa MPa N/m² N/mm² bar mbar mmH₂O 4°C cmH₂O 4°C dmH₂O 4°C mH₂O 4°C inH₂O 4°C ftH₂O 4°C mmHg 0°C cmHg 0°C inHg 0°C g/cm² kg/cm² dyn/cm² oz/in² psi ksi tsi uk long tsi us short tsf us short psf atm at Torr mTorr bar centimetres of mercury at 0°C centimetres of water at 4°C decimetres of water at 4°C dynes per sq centimetre feet of water at 4°C grams per sq centimetre hectopascals inches of mercury at 0°C inches of water at 4°C kilograms per sq centimetre kilopascals kilopounds per sq inch megapascals metres of water at 4°C microns of mercury at 0°C millibars millimetres of mercury at 0°C millimetres of water at 4°C millitorrs newtons per sq metre newtons per sq millimetre ounces per sq inch pascals pounds per sq foot pounds per sq inch standard atmospheres technical atmospheres tons per sq foot (us short) tons per sq inch (uk long) tons per sq inch (us short) torrs
Psuction [?]
Select suction unit mbar inHg 0°C mmHg 0°C Torr psi hPa kPa bar Pa hPa kPa MPa N/m² N/mm² bar mbar mmH₂O 4°C cmH₂O 4°C dmH₂O 4°C mH₂O 4°C inH₂O 4°C ftH₂O 4°C mmHg 0°C cmHg 0°C inHg 0°C g/cm² kg/cm² dyn/cm² oz/in² psi ksi tsi uk long tsi us short tsf us short psf atm at Torr mTorr bar centimetres of mercury at 0°C centimetres of water at 4°C decimetres of water at 4°C dynes per sq centimetre feet of water at 4°C grams per sq centimetre hectopascals inches of mercury at 0°C inches of water at 4°C kilograms per sq centimetre kilopascals kilopounds per sq inch megapascals metres of water at 4°C microns of mercury at 0°C millibars millimetres of mercury at 0°C millimetres of water at 4°C millitorrs newtons per sq metre newtons per sq millimetre ounces per sq inch pascals pounds per sq foot pounds per sq inch standard atmospheres technical atmospheres tons per sq foot (us short) tons per sq inch (uk long) tons per sq inch (us short) torrs
Vacuum Pressure (Pbaro - Psuction = Pvac)
Pvac [?]
Select vacuum unit mbar inHg 0°C mmHg 0°C Torr psi hPa kPa bar Pa hPa kPa MPa N/m² N/mm² bar mbar mmH₂O 4°C cmH₂O 4°C dmH₂O 4°C mH₂O 4°C inH₂O 4°C ftH₂O 4°C mmHg 0°C cmHg 0°C inHg 0°C g/cm² kg/cm² dyn/cm² oz/in² psi ksi tsi uk long tsi us short tsf us short psf atm at Torr mTorr bar centimetres of mercury at 0°C centimetres of water at 4°C decimetres of water at 4°C dynes per sq centimetre feet of water at 4°C grams per sq centimetre hectopascals inches of mercury at 0°C inches of water at 4°C kilograms per sq centimetre kilopascals kilopounds per sq inch megapascals metres of water at 4°C microns of mercury at 0°C millibar millimetres of mercury at 0°C millimetres of water at 4°C millitorrs newtons per sq metre newtons per sq millimetre ounces per sq inch pascals pounds per sq foot pounds per sq inch standard atmospheres technical atmospheres tons per sq foot (us short) tons per sq inch (uk long) tons per sq inch (us short) torrs

Related Tools

• Calculate suction pressure from barometric and vacuum pressure
• Convert pressure to different units

User Guide

This tool will calculate the absolute referenced vacuum pressure by subtracting the suction from the barometric pressure reading you entered and convert any combination of pressure units for each pressure value.  For more information please refer to our suction & vacuum pressure guide.

P_baro – Barometric Pressure

Enter the barometric pressure and select the associated pressure units directly underneath.  The barometric pressure should be measured at the same location and time as the suction pressure was measured. For more information please refer to our barometric pressure guide.

P_suction – Suction Pressure

Enter the suction pressure as a positive value and select the associated pressure units directly underneath. For more information please refer to our vacuum guide.

P_vac – Vacuum

The vacuum is calculated by subtracting the suction pressure from the barometric pressure, and will appear once the required pressure units are selected directly underneath. The vacuum will display as a positive absolute pressure. For more information please refer to our suction pressure guide.