VSWR Calculator (Forward and Reflected Power)
Calculate voltage standing wave ratio (VSWR) from measured forward and reflected power. Values may be entered independently in milliwatts, watts, or dBm; both measurements must refer to the same point in the RF system.
Result will appear here
Formula:
VSWR = (1 + √(Pr/Pf)) / (1 - √(Pr/Pf))
Where:
- Pf = Forward Power (W)
- Pr = Reflected Power (W)
Common VSWR Reference Points:
- VSWR 1.0:1 = Perfect match
- VSWR 1.5:1 = Good match
- VSWR 2.0:1 = Acceptable
- VSWR 3.0:1 = Significant mismatch
This tool helps with:
Assessing impedance matching from directional power measurements.
Comparing forward and reflected power in mixed supported units.
Identifying excessive reflections in RF transmission systems.
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Last updated on September 23, 2026
Author: IBL-Editors Team
Technical Review: Andreas Bender - Deputy Managing Director | IBL-Lab GmbH Give feedback on this article
Author: IBL-Editors Team
Technical Review: Andreas Bender - Deputy Managing Director | IBL-Lab GmbH Give feedback on this article