Use this calculator to convert from millivolt (**mV**) RMS to Power in **dBm**

The default value of impedance is 50 ohm although it can be changed in the calculator below

**Background**

**dBm**, which stands for decibel milliwatt, is a unit of measurement used in telecommunications and electronics to express power levels on a logarithmic scale relative to one milliwatt (1 mW).

dBm is commonly used to quantify the power of electrical signals, particularly in the context of radio frequency (RF) and microwave systems. It is a convenient way to represent power levels over a wide range, from very low to very high power.

A **millivolt** (mV) is a unit of electrical potential difference or voltage in the International System of Units (SI). The prefix “milli-” means one thousandth, so one millivolt is equal to one-thousandth (1/1000) of a volt (V).

The symbol for millivolt is “mV,” and it is commonly used to express small voltage values. Millivolts are often used in electronics, electrical engineering, and various scientific measurements, where it is necessary to work with low-level voltage signals or when fine voltage measurements are required.

For example, when measuring the voltage output of a temperature sensor, the voltage may be expressed in millivolts. Similarly, many digital multimeters and oscilloscopes provide voltage measurements in millivolts for precise readings of small voltage levels.