Friis Transmission Equation
Calculate Friis Transmission Equation instantly with the exact formula and a worked example.
Friis Transmission Equation
TX power, dBm
G_t, dBi
G_r, dBi
λ, m
d, m
P_r (receiver)
-60.046dBm
P_r
-60,05 dBm
More about: Friis Transmission Equation
What it calculates
The “Friis Transmission Equation” calculator computes P_r (receiver) in dBm from 5 parameters: tx power, dbm, g_t, dbi, g_r, dbi, λ, m, d, m.
A standard physics formula used in educational and engineering tasks.
Example calculation
With parameters TX power, dBm = 20, G_t, dBi = 10, G_r, dBi = 10, λ, m = 0.125, d, m = 1,000 the result is -60.05 dBm.
How to use
- Enter tx power, dbm, g_t, dbi, g_r, dbi, λ, m and d, m — each field above is adjustable with a slider.
- P_r (receiver) (dBm) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Friis Transmission Equation calculated?
The Friis Transmission Equation calculator computes P_r (receiver) (in dBm) from tx power, dbm, g_t, dbi, g_r, dbi, λ, m, d, m. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Friis Transmission Equation calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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