Convert Feet of Water to Kilopascals
Convert Feet of Water (ftH₂O) to Kilopascals (kPa) instantly and accurately.
Conversion Formula
kPa = ftH₂O × 2.98906692
About Feet of Water
One foot of water column (ftH₂O) ≈ 2,989 Pa - the US customary equivalent of cmH₂O used in civil and hydraulic engineering. Municipal water supply systems are designed for 40-80 psi head ≈ 92-184 ft; fire suppression sprinkler systems require minimum 7 psi ≈ 16 ft. Well pump specifications, sump pump head ratings, irrigation mainline pressure, and drainage calculations all use feet of head. 1 ft of water = 12 in WC = 0.4335 psi ≈ 2,989 Pa.
About Kilopascals
A kilopascal (kPa) = 1,000 Pa - the practical everyday SI pressure unit for moderate pressures. Car tyre inflation: 200-250 kPa (29-36 psi); truck tyres 550-830 kPa. Blood pressure in SI countries: 16/10.7 kPa (= 120/80 mmHg). Systolic blood pressure 16 kPa. Carbonated beverages are packaged at 200-500 kPa CO₂. Medical oxygen cylinders at 15,000 kPa; scuba cylinders 200-300 bar = 20,000-30,000 kPa. 1 kPa = 1,000 Pa = 0.01 bar = 0.145 psi.
Quick Reference Table
| Feet of Water (ftH₂O) | Kilopascals (kPa) |
|---|---|
| 1 ftH₂O | 2.98907 kPa |
| 2 ftH₂O | 5.97813 kPa |
| 5 ftH₂O | 14.9453 kPa |
| 10 ftH₂O | 29.8907 kPa |
| 25 ftH₂O | 74.7267 kPa |
| 50 ftH₂O | 149.453 kPa |
| 100 ftH₂O | 298.907 kPa |