The MEL Day Calculator allows rapid and accurate calculation of category A, B, C and D intervals. It allows custom intervals to be set for category A as well as the standard 3, 10 and 120-day intervals for categories B, C and D.

The reference date can be freely altered and there is a UTC clock always displayed.

Intervals which have already expired (based on the present UTC date) will display a red cross whilst those yet to expire display a green tick.

Please enjoy this app but also always check any information provided with your own independent calculations.