This tool gives the VSWR from the percent reflected power.

Enter the **% reverse power** and both the reflection coefficient (**Γ**) and Voltage Standing Wave Ratio (**VSWR** or SWR) will be calculated.

**Formula**

**Γ** = **√**(**Reverse Power _{%}/100)**

**VSWR = (1+|Γ|)/(1-|Γ|)**

**Example Calculation**

If the reverse power is **5%**, the VSWR is **1.58**. Slightly higher than a target value of **1.5** (considered a good value).

If **50%** of the power is reflected, the VSWR is **5.82**. That represents a poor match.

If all the power is reflected, **Γ = 1**, the VSWR is **∞** – the poorest possible match.

**Related Calculators**

VSWR from Forward and Reflected Power