Friis Transmission Calculator
Enter transmit power, gains, frequency and distance to get the received power.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
The Friis transmission equation, Pr = Pt·Gt·Gr·(λ/4πd)², relates the power received by an antenna to the transmit power, the transmit and receive antenna gains, the signal's wavelength, and the distance between them in free space, capturing how radiated power spreads out and weakens with the square of distance (and, equivalently, drops as frequency rises for a fixed distance).
RF and wireless communication engineers use it as a first-pass link budget calculation when designing Wi-Fi, satellite, radar and point-to-point microwave links, to check whether a receiver will get enough signal above its noise floor before ever building or testing the hardware.
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