Ham Radio Tools

Free calculators and converters for the ham radio operator.

Antenna Calculator

Calculate dipole, vertical, and J-pole element lengths for any frequency.

Feed line loss in dB for different cable types at frequency and length.

Find the right AWG wire size for a given current and cable length.

Convert between dBm and watts instantly.

Enter any HF frequency and find out which ham band it falls on.

Calculate standing wave ratio from forward and reflected power.

12 V / 13.8 V DC run voltage drop and percent loss by wire gauge and current.

Maidenhead locator to locator — distance in miles/km and bearing.

Electrical quarter-wave and half-wave coax lengths by frequency and velocity factor.

One-click band presets with dipole, vertical, loop, and more formulas.