Pressure, temperature & flow unit converter
Type a value, pick a unit, and see every equivalent in that category at once. Built for process instrumentation work — gauges, transmitters, RTDs and flow readings.
Factors follow NIST SP 811. Gauge vs absolute: these units convert magnitude only — they do not add or remove atmospheric pressure. A reading of 0 psig is ~14.696 psia at sea level; confirm whether your instrument is gauge (g) or absolute (a) before using the result.
Water-column units: inH₂O and ftH₂O depend slightly on water temperature. We include 4 °C (39.2 °F), 60 °F and 68 °F variants. (1 atm ≈ 407.19 inH₂O at 60 °F, or ≈ 406.79 inH₂O at 4 °C.)
Supports negative values (e.g. −40 °F = −40 °C). Absolute zero is 0 K = −273.15 °C = −459.67 °F = 0 °R.
Volumetric liquid flow only. US gallon = 231 in³ (exact). Oil barrel = 42 US gal. Imperial gallon = 4.54609 L. No SCFM/ACFM gas corrections — those need pressure, temperature and gas composition.
Conversions are for reference. For NIST-traceable calibration of pressure gauges, transmitters, RTDs, thermocouples and related instruments in the Chicago area, northern Illinois and southeast Wisconsin, request a calibration quote or call Bob.
Need the instrument calibrated, not just converted?
CML calibrates pressure, temperature and transmitter instruments in-house and on-site — Antioch HQ, with Beamex MC6 and CMX records.