Home Calculators
FREE RADIO CALCULATORSThe radio math, worked out for you.
Five small calculators for the formulas that keep coming up on the ham and FCC exams, and at the workbench. Type a number, get the answer, and see the steps so it sticks. No account needed.
What do you want to work out?
Frequency and wavelengthHow long is one radio wave at this frequency?42 exam questions touch thisOpen calculator →Ohm's law and powerIf I know two of voltage, current, resistance or power, what are the other two?92 exam questions touch thisOpen calculator →Decibels (dB)How many dB is this gain or loss?55 exam questions touch thisOpen calculator →Resonant frequency (LC circuit)At what frequency does this coil and capacitor ring?42 exam questions touch thisOpen calculator →Dipole and whip antenna lengthHow long should I cut my antenna wire?36 exam questions touch thisOpen calculator →
How these calculators help
- White boxes are yours to type in. Green boxes are the answers, worked out for you.
- Every answer comes with the steps, so you learn the method and not just the number.
- Tap the small i next to any label for a plain-English explanation.
- Each page links to the exams where the topic appears.