U.S. fire-protection sheets usually list pressure in pounds per square inch (psi), while many metric drawings, international pump curves, and product datasheets use kilopascals (kPa). Using the standard conversion, 1 psi = 6.894757 kPa, so kPa ÷ 6.894757 = psi and psi × 6.894757 = kPa. This page is a free browser converter either direction. It is for learning and quick checks—not a substitute for the criteria adopted by your authority having jurisdiction, manufacturer data, a sealed hydraulic calculation, or review by a licensed design professional. It is not a design stamp and not a PE seal.
How the conversion is used
- Confirm which unit your source uses (psi on most U.S. flow-test and sprinkler sheets; kPa on many metric drawings and international datasheets).
- Convert with 1 psi = 6.894757 kPa: Ppsi = PkPa / 6.894757, or PkPa = Ppsi × 6.894757.
- Keep the same pressure meaning (static, residual, rated pump pressure, or demand) when you switch units, and note whether the source is gauge or absolute pressure.
- After units match, continue with head conversions, hydrant, tank, or pump sketches in consistent units.
Free calculator
Educational approximation only. Uses 1 psi = 6.894757 kPa (100 kPa = 1 bar). Nothing you enter leaves your browser. For bar see the PSI to bar calculator; for head see PSI to feet of head. Pump demand vs supply sketches live in the Fire Pump & Tank Sizing workbook.
Worked example
A metric datasheet lists 700 kPa: 700 / 6.894757 ≈ 101.5 psi. Conversely, a 65 psi residual pressure × 6.894757 ≈ 448.2 kPa. Always confirm the source unit and check the result against the adopted edition, manufacturer data, and AHJ—not this page alone.
Next steps: convert to bar with the free PSI to bar calculator, convert head with the PSI to feet of head calculator, check pump demand with the fire pump curve check, and run full pump and tank tables in the Fire Pump & Tank Sizing workbook ($49). For sprinkler segment friction, use the Sprinkler Pipe Friction Loss workbook ($29).