Feedline Impedance Calculator
Calculate feedline impedance with this free online tool
Parallel Wire (Ladder Line)
Coaxial Cable
Common Feedline Reference
| Type | Impedance | VF | Loss @ 10m/30MHz | Use |
|---|---|---|---|---|
| RG-58 | 50 Ω | 66% | 1.4 dB | Short runs, HF |
| RG-8X | 50 Ω | 78% | 1.1 dB | Medium runs |
| RG-213 | 50 Ω | 66% | 0.7 dB | HF/VHF base |
| RG-6 | 75 Ω | 75% | 0.8 dB | Receive only |
| LMR-400 | 50 Ω | 85% | 0.4 dB | VHF/UHF base |
| 9913 | 50 Ω | 84% | 0.4 dB | Low loss runs |
| 450 Ω ladder | 450 Ω | 95% | 0.1 dB | HF antennas |
| 300 Ω twinlead | 300 Ω | 82% | 0.2 dB | TV / folded dipoles |
| Window line | 400-450 Ω | 95% | 0.05 dB | Multiband HF |
The Feedline Impedance Calculator is a free tool that runs entirely in your browser. No sign-up, no downloads — just open and use it.
Key Features
Free feedline impedance calculator with instant results
No registration or signup required
Professional-grade feedline impedance calculator tool
Works on all devices and browsers
Privacy-first: all processing happens in your browser
Unlimited usage with no restrictions
How to Use Feedline Impedance Calculator
Enter Your Data
Input your values or data into the feedline impedance calculator tool fields
Configure Options
Adjust any optional settings or parameters for your specific needs
Get Instant Results
The tool automatically calculates and displays results in real-time
Copy or Export
Copy the results to clipboard or use them directly in your project
Repeat as Needed
Run the tool again with different inputs — unlimited usage, completely free
Use Cases
Use feedline impedance calculator for personal projects
Professional and academic applications
Quick reference and verification
Everyday productivity and convenience
Frequently Asked Questions
Is the Feedline Impedance Calculator free to use?
Yes, the Feedline Impedance Calculator is completely free with no registration required. Use it as many times as you need.
Do I need to create an account?
No account needed. All tools work instantly in your browser without any signup or login.
Is my data safe?
Absolutely. All processing happens locally in your browser. Your data is never sent to any server.
Does the Feedline Impedance Calculator work on mobile?
Yes, the tool is fully responsive and works on phones, tablets, and desktop computers.
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