Friis Transmission Equation
Pr = PtGtGr(λ/(4πd))²
FSPL (dB)
FSPL = 20 log10(d) + 20 log10(f) + 20 log10(4π/c)
dBm to mW
PmW = 10(PdBm/10)
Inverse Square Law
I = P / (4πr²)
Where:
I = Intensity
P = Power
r = Distance
dBi Definition
GdBi = 10 log10(Gi/Giso)
FSPL Simplified
FSPL (dB) = 32.44 + 20 log10(dkm) + 20 log10(fMHz)

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Friis Transmission Equation
Pr = PtGtGr(λ/(4πd))²
Where:
Pr = Received power (W)
Pt = Transmitted power (W)
Gt = Transmit antenna gain
Gr = Receive antenna gain
λ = Wavelength (m)
d = Distance (m)
Free Space Path Loss (FSPL)
FSPL (dB) = 20 log10(d) + 20 log10(f) + 20 log10(4π/c)

Simplified version:
FSPL (dB) = 32.44 + 20 log10(dkm) + 20 log10(fMHz)
Where:
d = Distance (km)
f = Frequency (MHz)
Power Conversions
dBm to mW:
PmW = 10(PdBm/10)

mW to dBm:
PdBm = 10 log10(PmW)

dBi Definition:
Antenna gain relative to isotropic radiator
GdBi = 10 log10(Gi/Giso)
Inverse Square Law
I = P / (4πr²)
Where:
I = Intensity
P = Power
r = Distance

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