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Pressure

ftH₂Otoksi

Convert feet of water column (4 °C) (ftH₂O) to kilopounds-force per square inch (ksi).

Factor1 ftH₂O = 0.0004335275 ksi

Converter

ftH₂O

Accepts numbers or expressions, e.g. 150 + 14.7

Result
0.433528ksi

Rendered to 6 significant figures.

Formula

Formula
ksi = ftH₂O × 0.0004335275

Multiply any value in feet of water column (4 °C) by 0.0004335275 to obtain the value in kilopounds-force per square inch.

Worked example

Convert 1000 ftH₂O to ksi.

  1. 01Start with 1000 ftH₂O.
  2. 02Multiply by the conversion factor: 1000 × 0.0004335275 = 0.433528 ksi.
Result1000 ftH₂O = 0.433528 ksi

Conversion table

ftH₂Oksi
10.00043353
20.00086706
50.0021676
100.0043353
200.0086706
500.021676
1000.043353
2000.086706
5000.21676
10000.43353

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from ftH₂O to ksi?
1 ftH₂O equals 0.0004335275 ksi. To convert, multiply the value in feet of water column (4 °C) by 0.0004335275.
How do I convert 1 ftH₂O to ksi?
1 ftH₂O = 0.000433528 ksi. For any value, multiply by 0.0004335275.
How do I convert ksi back to ftH₂O?
Divide by the same factor — or equivalently, multiply by 2306.659. So 1 ksi = 2306.66 ftH₂O.
When would I need to convert foot of water column (4 °C) to kilopound-force per square inch?
Pressure conversions between ftH₂O and ksi are common when working with mixed-vendor instrumentation, when piping codes use different units to process datasheets, or when converting field readings into SI for hydraulic calculations.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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