Ham Radio Tools
Calculators, references, and utilities for amateur radio operators
Antenna Calculator
Calculate dipole, vertical, and other antenna dimensions. Supports metric and imperial units.
Band Plan Reference
Interactive band plan charts. Customize by license class and preferred bands.
Satellite Pass Predictor
Track amateur radio satellites. Get pass times and frequencies for your location.
Contest Calendar
Upcoming ham radio contests and special events. Never miss a contest again.
Repeater Search
Find repeaters near you. Filter by band, mode, and features.
Hamfest Locator
Discover hamfests and swap meets in your area. Plan your next radio adventure.
Callsign Lookup
Look up US amateur radio callsigns. Get license info, grid square, and more.
Radio Prices
Compare ham radio equipment prices across vendors. Find the best deals.
Quick Calculators
Frequency ↔ Wavelength
Enter a frequency above
Half-Wave Dipole Length
Enter a frequency above
Quarter-Wave Vertical
Enter a frequency above
Distance (Grid Squares)
Enter two grid squares