Antenna Calculators
Professional-grade antenna design tools for amateur radio operators. Free, accurate, and backed by well-established formulas from trusted sources.
HFPortableQRPCompact
Magnetic Loop
Design compact, high-Q magnetic loop antennas. Calculate loop dimensions, tuning capacitor requirements, efficiency, and Q-factor. Perfect for apartments, portable operations, and space-limited installations.
Features:
- Efficiency and Q-factor calculation
- Capacitor voltage stress analysis
- Multiple loop shapes (circle, square, octagon)
- Performance charts and diagrams
- RF safety estimates
HFWireAll BandsSimple
Dipole Antenna
Calculate wire lengths for horizontal and inverted vee dipole antennas. Includes end-effect corrections, impedance estimates, and bandwidth calculations. The most popular wire antenna for all bands.
Features:
- Horizontal and inverted vee configurations
- End-effect and height corrections
- Feedpoint impedance estimates
- SWR bandwidth calculation
- Interactive antenna diagrams
Why Use HamCalc?
✓
Accurate Formulas
Based on established references from AA5TB, 66pacific, M0UKD, and the ARRL Antenna Book.
⚡
Real-Time Results
Instant calculations as you adjust parameters. All processing happens in your browser.
📊
Visual Feedback
Interactive diagrams and performance charts help you understand your design at a glance.
Getting Started
1
Choose
Pick a calculator
2
Configure
Enter parameters
3
Review
Check results
4
Export
Get build pack
5
Build
Assemble & tune
More calculators coming soon: Vertical, Inverted L, Yagi, and more.