HVAC field calculator

Head ↔ Pressure

Convert feet of liquid head to PSI and PSI back to feet of head.

Feet of head

Fluid specific gravity (SG)

Water is approximately 1.000. Change this for glycol or another fluid.

CALCULATED RESULT

4.335 PSI

PSI = ft of head × 0.4335 × SG

Water reference: 1 PSI ≈ 2.31 ft of head at SG 1.000. Actual pressure varies with fluid density and temperature. This is a static head conversion, not a friction-loss or pump-performance calculation.