Enter the total head (ft) and the specific gravity into the calculator to determine the Pressure From Head.
- All Unit Converters
- All Pressure Calculators
- Pressure to Head Calculator
- Water Pressure Calculator
- Static Head Calculator
Pressure From Head Formula
The following formula is used to calculate the Pressure From Head.
P = .433*H*SG
- Where P is the Pressure From Head (psi)
- H is the total head (ft)
- SG is the specific gravity
To calculate pressure from head, multiply the head by .433, then multiply again by the specific gravity.
| Head (ft) | Pressure (psi) | bar | kPa | MPa |
|---|---|---|---|---|
| 1 | 0.433 | 0.030 | 2.988 | 0.003 |
| 2 | 0.867 | 0.060 | 5.975 | 0.006 |
| 3 | 1.300 | 0.090 | 8.963 | 0.009 |
| 4 | 1.733 | 0.120 | 11.951 | 0.012 |
| 5 | 2.167 | 0.149 | 14.939 | 0.015 |
| 6 | 2.600 | 0.179 | 17.926 | 0.018 |
| 8 | 3.467 | 0.239 | 23.902 | 0.024 |
| 10 | 4.333 | 0.299 | 29.877 | 0.030 |
| 12 | 5.200 | 0.359 | 35.853 | 0.036 |
| 15 | 6.500 | 0.448 | 44.816 | 0.045 |
| 20 | 8.667 | 0.598 | 59.755 | 0.060 |
| 25 | 10.833 | 0.747 | 74.693 | 0.075 |
| 30 | 13.000 | 0.896 | 89.632 | 0.090 |
| 40 | 17.333 | 1.195 | 119.509 | 0.120 |
| 50 | 21.667 | 1.494 | 149.386 | 0.149 |
| 60 | 26.000 | 1.793 | 179.264 | 0.179 |
| 80 | 34.667 | 2.390 | 239.018 | 0.239 |
| 100 | 43.333 | 2.988 | 298.773 | 0.299 |
| 150 | 65.000 | 4.482 | 448.159 | 0.448 |
| 200 | 86.667 | 5.975 | 597.546 | 0.598 |
| * Rounded to 3 decimals. Assumes SG = 1.00 (water). Formula: P(psi) = H(ft) × 62.4 / 144 ≈ H × 0.4333. Unit conversions: 1 psi = 6.89476 kPa = 0.0689476 bar = 0.00689476 MPa. | ||||
How to Calculate Pressure From Head?
The following two example problems outline how to calculate the Pressure From Head.
Example Problem #1:
- First, determine the total head (ft). In this example, the total head (ft) is given as 1235.
- Next, determine the specific gravity. For this problem, the specific gravity is given as 40.
- Finally, calculate the Pressure From Head using the equation above:
P = .433*H*SG
Inserting the values from above and solving the equation with the imputed values gives:
P = .433*1235*40 = 21390.2 (psi)
Example Problem #2:
Using the same process as above, first define the variables required by the formula. In this case, these values are:
total head (ft) = 55
specific gravity = 125
Entering these values yields:
P = .433*55*125 = 2976.875 (psi)
