Enter the maximum voltage and the minimum voltage into the calculator to determine the voltage standing wave ratio (VSWR).

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## VSWR Formula

The following formula is used to calculate a voltage standing wave ratio:

VSWR = Vmax / Vmin

- Where VSWR is the voltage standing wave ratio
- Vmax is the maximum voltage
- Vmin is the minimum voltage

VSWR can also be calculated using several other formulas. One of which used the reflection coefficient as shown:

VSWR = 1+ r / 1 – r

- Where r is the reflection coefficient

## VSWR Definition

**What is VSWR? **

VSWR stands for voltage standing wave ratio. It is a measure of how efficiently radio frequency power is transmitted from a source to a load through a transmission line.

## Example Problem

How to calculate VSWR?

**First, determine the maximum voltage.**This is the maximum voltage of the signal along the transmission line. For this example, the maximum voltage is found to be 50 V.

**Next, determine the minimum voltage.**This is the minimum voltage along the same line. In this case, the minimum voltage is found to be 20V.

**Finally, calculate the VSWR.**Calculate the voltage standing wave ratio using the formula above:

VSWR = Vmax / Vmin

VSWR = 50/20

VSWR = 2.5