Enter the pressure range (e.g., psi), the voltage reading (volts), the upper voltage limit (volts), and the voltage lower limit (volts) into the calculator to determine the Pressure From Voltage.
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Pressure From Voltage Formula
The following formula is used to calculate the Pressure From Voltage.
P = PR * (Vr - VL) / (Vu - VL)
- Where P is the pressure (same units as PR; commonly psi)
- PR is the pressure range (full-scale span; commonly psi)
- Vr is the voltage reading (volts)
- VL is the voltage lower limit (volts)
- Vu is the voltage upper limit (volts)
Note: This form assumes a linear sensor where pressure is 0 at VL, and pressure is PR at Vu. If your sensor is calibrated from a nonzero lower pressure PL to an upper pressure PH, use:
P = P_L + (P_H - P_L) * (Vr - VL) / (Vu - VL)
| Voltage (V) | Pressure (psi) | bar | kPa | atm |
|---|---|---|---|---|
| 1.0 | 0 | 0.000 | 0.000 | 0.000 |
| 1.2 | 5 | 0.345 | 34.474 | 0.340 |
| 1.4 | 10 | 0.689 | 68.948 | 0.680 |
| 1.6 | 15 | 1.034 | 103.421 | 1.021 |
| 1.8 | 20 | 1.379 | 137.895 | 1.361 |
| 2.0 | 25 | 1.724 | 172.369 | 1.701 |
| 2.2 | 30 | 2.068 | 206.843 | 2.041 |
| 2.4 | 35 | 2.413 | 241.317 | 2.382 |
| 2.6 | 40 | 2.758 | 275.790 | 2.722 |
| 2.8 | 45 | 3.103 | 310.264 | 3.062 |
| 3.0 | 50 | 3.447 | 344.738 | 3.402 |
| 3.2 | 55 | 3.792 | 379.212 | 3.743 |
| 3.4 | 60 | 4.137 | 413.686 | 4.083 |
| 3.6 | 65 | 4.482 | 448.159 | 4.423 |
| 3.8 | 70 | 4.826 | 482.633 | 4.763 |
| 4.0 | 75 | 5.171 | 517.107 | 5.103 |
| 4.2 | 80 | 5.516 | 551.581 | 5.444 |
| 4.4 | 85 | 5.861 | 586.055 | 5.784 |
| 4.6 | 90 | 6.205 | 620.528 | 6.124 |
| 4.8 | 95 | 6.550 | 655.002 | 6.464 |
| * Rounded to 3 decimals. Assumes linear sensor with V_low = 1.0 V, V_high = 5.0 V and pressure range 0–100 psi. Conversion factors: 1 psi = 0.0689476 bar = 6.89476 kPa = 0.068046 atm. | ||||
How to Calculate Pressure From Voltage?
The following example problems outline how to calculate the Pressure From Voltage.
Example Problem #1
- First, determine the pressure range (psi). In this example, the pressure range (psi) is given as 100.
- Next, determine the voltage reading (volts). For this problem, the voltage reading (volts) is given as 22.5.
- Next, determine the voltage lower limit (volts). In this case, the voltage lower limit (volts) is found to be 15.
- Next, determine the upper voltage limit. For this problem, this is 30.
- Finally, calculate the Pressure From Voltage using the formula above:
P = PR * (Vr - VL) / (Vu - VL)
Inserting the values from above and solving yields:
P = 100 * (22.5 - 15) / (30 - 15) = 50.00 (psi)
Example Problem #2
Using the same method as above, determine the variables required by the equation. For this example problem, these are provided as:
pressure range (psi) = 500
voltage reading (volts) = 3
voltage lower limit (volts) = 1
voltage upper limit (volts) = 5
Entering these given values yields:
P = 500 * (3 - 1) / (5 - 1) = 250 (psi)
