Enter the frequency, resistance, and capacitance into the calculator to determine the voltage. This calculator can also evaluate any of the variables given the others are known.

Hz To Voltage Calculator

Simple LM331 frequency-to-voltage helper. Choose a mode, enter values, and press Calculate.

Simple Hz → V
Advanced LM331
RPM → V

Enter frequency to estimate LM331 output using typical Rt = 100 kΩ and Ct = 0.01 µF.

Note: Uses LM331 F-to-V equation V = 2.09 · f · Rt · Ct. Simple and RPM modes assume Rt = 100 kΩ and Ct = 0.01 µF (≈ 2.09 mV/Hz).

Hz To Voltage Formula

The following formula is used to calculate the voltage from a frequency signal. 

 V = 2.09 · f · Rt · Ct

Variables:

  • V is the voltage (Volts)
  • Hz is the frequency (Hertz)
  • R is the resistance (Ohms)
  • C is the capacitance (Farads)

To calculate the voltage, multiply the frequency (in Hertz) by the resistance (in Ohms) and the capacitance (in Farads). The result will be the corresponding voltage level. This formula is based on the principle of a basic frequency-to-voltage converter circuit.

Frequency to Voltage Conversion Table (LM331, K = 2.09, Rt = 100 kΩ, Ct = 10 nF)
Frequency (Hz) Output Voltage (V)
10.002
50.010
100.021
200.042
500.105
1000.209
2000.418
2500.523
5001.045
7501.568
1,0002.090
1,5003.135
2,0004.180
2,5005.225
3,0006.270
4,0008.360
5,00010.450
6,00012.540
8,00016.720
10,00020.900
* Rounded to 3 decimals. Uses V = 2.09·f·Rt·Ct with Rt = 100 kΩ and Ct = 10 nF (≈ 2.09 V/kHz). Practical output is limited by supply rails and RL/RS.

What is Hz To Voltage?

Hz to Voltage is a conversion process often used in electronic devices and signal processing. Hz, or Hertz, is a unit of frequency that measures the number of cycles per second. Voltage, on the other hand, is a measure of electrical potential difference between two points in a circuit. Therefore, converting Hz to Voltage involves translating a frequency signal into a corresponding voltage level. This is typically done using a frequency-to-voltage converter circuit.

How to Calculate Hz To Voltage?

The following steps outline how to calculate the Hz To Voltage using the formula: V = (Hz * R * C).

  1. First, determine the frequency (Hz).
  2. Next, determine the resistance (R) in ohms.
  3. Next, determine the capacitance (C) in farads.
  4. Next, use the formula V = (Hz * R * C) to calculate the voltage (V) in volts.
  5. Finally, calculate the Hz To Voltage.
  6. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

frequency (Hz) = 50

resistance (R) = 100

capacitance (C) = 0.001