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Radio Link Calculators

Free online calculators for radio links: radio horizon, free-space path loss and Fresnel zone. They run in your browser and work from 0 to 3000 MHz.

Radio Horizon CalculatorLine-of-sight range from antenna heights.Free-Space Path Loss CalculatorPath loss in dB and received power for any link.Fresnel Zone CalculatorFirst Fresnel zone radius and required clearance.

Which calculator do I need?

Use the radio horizon calculator to see how far two antennas can see each other over level ground. Use the free-space path loss calculator to size a link in dB. Use the Fresnel zone calculator to know how much clearance a path needs. For the real result over terrain, with hills, valleys and the ionosphere included, open the full coverage map.

Explore more

How it worksThe model behind the map: ionosphere, terrain, diffraction and noise. LearnGuides to horizon, terrain, diffraction and frequency bands. FAQAnswers to the most common coverage questions. AboutData sources, methodology and limits.

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Coverage values are estimates computed by MFH and are indicative only. Elevation data: SRTM, NASA/USGS (public domain). Methodology · About and limits · Live HF propagation data

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