Notes:
I made this calculator while looking for detectors that were shotnoise limited. By inserting the Noise Equivalent Power (NEP) of your detector in the "Shot noise" field, the number in the "Power" field will be the minimum power for shot noise limited operation (\(\frac{\text{Shot noise}}{\text{Electronic noise}}>1\)). The formula is taken from the Supplamental Information of the paper Chowdhury et al. 2022
$$S_{PP}(\omega)=\frac{2h c}{\lambda} P$$