Tools you might need next
Calculate half-wave dipole and quarter-wave vertical antenna element length from frequency. Includes velocity factor correction for wire type.
Calculate Standing Wave Ratio from forward and reflected power readings. Convert SWR to return loss and reflected power percentage.
Calculate coaxial cable RF signal loss in dB from cable type, run length, and frequency. Estimate transmit power delivered to your antenna.
This tool applies a standard formula from the relevant domain. The computation is deterministic — given the same inputs, the result is always identical. The formula accounts for the primary variables that determine the output.
PARIS standard: dot = 1 unit; dash = 3; element gap = 1; char gap = 3; word gap = 7Updated: July 2026
A typical use case demonstrating the calculator with representative values.
→ Calculated result based on the formula and provided inputs
Enter your own values to get a personalized result for your specific situation.
→ Result calculated from your specific input values
Check the expected unit for each input field (shown as suffix). Converting between imperial and metric units before entering values prevents calculation errors.
This calculator uses the formula shown. Real-world results may vary due to factors not captured by the model. Use the result as an estimate and verify with domain-specific standards.
Calculate Morse code timing elements from words-per-minute speed. Free online ham radio calculator with instant, accurate results. It applies the calculation formula (PARIS standard: dot = 1 unit; dash = 3; element gap = 1; char gap = 3; word gap = 7). For example: 20 wpm standard timing — A typical use case demonstrating the calculator with representative values.