dB to Voltage Converter

Decibels (dB) and voltage represent two essential concepts in the fields of electronics, audio engineering, telecommunications, and signal processing. If you are involved with amplifiers, sensors, audio equipment, or RF systems, you will frequently need to make conversions between dB and voltage.

What is dB (Decibel)?

The decibel (dB) is a logarithmic unit used to express the ratio between two values, most often power, intensity, or voltage levels. It helps simplify calculations that deal with very large or very small numbers.

• It is a ratio, not an absolute unit.
• Logarithmic, meaning every 20 dB increase represents a 10× increase in voltage.

What Is Voltage?

Voltage (V) is the electrical potential difference between two points. It tells you how much “push” an electric charge experiences.

Voltage is a foundational concept in all electronics.

How Are dB and Voltage Related?

Although dB is often used to compare power, it can also compare voltage, but only if the impedance (resistance) remains constant.

When impedance is constant:

$$\text{Power}\propto \text{Voltage}{2}^{}$$

This tells you how much a signal has increased or decreased from one voltage level to another.

Voltage Ratio Formula

$$\frac{V{\mathrm{(out)}}_{}}{V{\mathrm{(in)}}_{}}={10}^{\left(\frac{\text{dB}}{20}\right)}$$

If you assume V_in = 1V (commonly used reference), then:

Absolute Voltage Formula

$$V{\mathrm{(out)}}_{}={10}^{\left(\frac{\text{dB}}{20}\right)}$$

How to convert dB to Voltage using our Converter?

1. Enter the decibel (dB) value.
2. Click “Calculate” to find the Voltage.