Working tools for radio and telecommunications: wavelength, antenna lengths and band, power in dBm / mW / W, dB and ratio, free-space path loss, channel capacity, VSWR and return loss, and a link budget. Results update as you type, entirely in your browser.
Wavelength, band & antenna
Frequency to wavelength (λ = c / f), the frequency band, and practical antenna lengths.
Power: dBm / mW / W
Enter a power in any unit; see it in all the others at once.
Decibels ↔ ratio
Convert between a decibel value and a linear ratio, for power (10 log) or amplitude/voltage (20 log).
Free-space path loss
Ideal line-of-sight loss between two antennas (FSPL = 20 log d + 20 log f + 32.44).
Channel capacity
Shannon-Hartley limit and spectral efficiency, plus the Nyquist rate if you give a number of signal levels.
VSWR, return loss & mismatch
Enter any one of VSWR, return loss, or reflection coefficient; get the rest, plus mismatch loss.
Link budget
EIRP, received power and margin. Total loss includes path loss and any other losses, in dB.