Ten standalone RF and antenna calculators for amateur radio operators. Numbers in, numbers out. No network, no accounts, no subscriptions.
CALCULATORS
- DIPOLE — half-wave dipole, quarter-wave vertical, and full-wave loop antenna lengths
- WAVELENGTH — bidirectional frequency and wavelength conversion with band identification
- PATH LOSS — free space path loss with S-meter context
- COAX LOSS — feedline attenuation for seven common cable types
- ERP/EIRP — effective radiated power with feedline loss and antenna gain
- SWR — standing wave ratio, return loss, mismatch loss, reflection coefficient
- POWER — Ohm's law solver and watts/dBm/dBW conversion
- LINK BUDGET — end-to-end signal path with selectable bandwidth
- LC RESONANCE — LC tank circuit frequency, inductance, and capacitance
- IMPEDANCE — L-network matching with low-pass and high-pass solutions
FEATURES
- All calculations update live as you type
- Tap any result to copy to clipboard
- Cross-tab import between calculators
- Built-in help text on every tab
- Green phosphor CRT terminal aesthetic
- No internet connection required
- No tracking, no analytics, no data collection
Part of the Phosphor radio suite alongside PhosphorRTTY, PhosphorCW, PhosphorHertz, and PhosphorSol.
SUPPORT
Need help with PhosphorCalc? Whether you have a question about how the app works, want to request a feature, or need to report a problem, you can reach us through the following channels:
- Ask a question — get help with using PhosphorCalc
- Report a bug — let us know if something isn't working
- Request a feature — suggest improvements or new functionality
We aim to respond to all support requests promptly. You can also browse existing issues to see if your question has already been answered.