In observance of the Fourth of July holiday, Fairview Microwave will be closed on Friday, July 3rd. Normal operations will resume on Monday, July 6. 500 Internal Server Error Oops, something went wrong. # Internal server error, refresh the page or contact us if the problem persists. Oops, something went wrong. # Internal server error, refresh the page or contact us if the problem persists. Signing Out Cancel Continue as Guest Fairview Microwave's Power Density Calculator is designed to give the power density, in Watts per square meter, at a given distance, output power and antenna gain. Please note that this calculator is only valid for far-field calculations. Calculation Power Density: Power Density in radar applications, is typically described by the non-directional power density multiplied by the gain of the radar. Notice that the distance D is an exponential component to the equation, due to the three-dimensional "spreading" of the waveform as it propagates through space. **Note: All of our calculators allow SI prefix input. For example, if you wish to input "25000000", just type "25M" instead. See the quick-reference table below for all compatible SI prefixes. Prefix Symbol Value Tera 'T' 1012 Giga 'G' 109 Mega 'M' 106 Kilo 'k' 103 Prefix Symbol Value pico 'p' 10-12 nano 'n' 10-9 micro 'u' 10-6 milli 'm' 10-3 Disclaimer: Fairview Microwave’s RF calculators are intended for educational use and for reference only. These RF calculators were designed by engineers and for engineers. Fairview Microwave does not make any claims that the results derived from these RF calculators are sufficient enough to fully design, build or test real products in real-world applications. Join our mailing list Join our mailing list Join our mailing list to receive the latest news and product information First name Last name