I used the value of 5g. Meaning that each dose of the cream/ointment/gel/emulsion is applied in 5g.
It could be a bit too much, depending on the cases, but for us it worked well. Then we adjusted the daily dose according to the number of applications/day according to the product leaflet.
This was excluded for product with lower presentations (e.g. 3mL products). Those were used as single dose products.
Hope it can help!