Standing wave ratio to reflection coefficient
Type a value in SWR to get it in Γ instantly.
0.2Γ
That's about the same as a good match. About 4% of the power is reflected back.
Convert the other way: Γ to SWR
What it means
How good is that match?
SWR is measured at the meter, not at the antenna. Feeder loss flatters the reading: a long lossy cable can make a bad antenna look well matched.
The math
How to convert SWR to Γ
Everything comes from the reflection coefficient: Γ = (SWR − 1) ÷ (SWR + 1). Return loss is −20 × log₁₀(Γ) and the reflected power is Γ² × 100 percent.
Example: 1.5 SWR = 0.2 Γ.
Every unit
Your match in every unit
Tables
SWR to Γ conversion table
| SWR | Γ |
|---|---|
| 1.01 SWR | 0.00497512 Γ |
| 1.1 SWR | 0.047619 Γ |
| 1.2 SWR | 0.0909091 Γ |
| 1.5 SWR | 0.2 Γ |
| 1.75 SWR | 0.272727 Γ |
| 2 SWR | 0.333333 Γ |
| 2.5 SWR | 0.428571 Γ |
| 3 SWR | 0.5 Γ |
| 4 SWR | 0.6 Γ |
| 5 SWR | 0.666667 Γ |
| 10 SWR | 0.818182 Γ |
Γ to SWR conversion table
| Γ | SWR |
|---|---|
| 0.00498 Γ | 1.01001 SWR |
| 0.0476 Γ | 1.09996 SWR |
| 0.0909 Γ | 1.19998 SWR |
| 0.2 Γ | 1.5 SWR |
| 0.273 Γ | 1.75103 SWR |
| 0.333 Γ | 1.9985 SWR |
| 0.429 Γ | 2.50263 SWR |
| 0.5 Γ | 3 SWR |
| 0.6 Γ | 4 SWR |
| 0.667 Γ | 5.00601 SWR |
| 0.818 Γ | 9.98901 SWR |
Quick answers
Quick answers
- How many Γ is 1 SWR?
- 1 SWR is 0 Γ.
- How many Γ is 10 SWR?
- 10 SWR is 0.818182 Γ.
- How many Γ is 1.5 SWR?
- 1.5 SWR is 0.2 Γ.
The units
About these units
Standing wave ratio (SWR)
The ratio of voltages along the feeder. 1:1 is perfect.
Reflection coefficient (Γ)
The fraction of the voltage that comes back.
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