Renters and purchasers always want to know how many prims they get. Here are the relationships:
0.2288818359375 prims per square meter, and:
4.3690666666666666666666666666667 square meters per prim.
If you know how many square meters you have (or are renting/purchasing), you divide the number of square meters by (roughly) 4.37 to arrive at the number of prims you will have or do have.
Conversely, if you already know how many prims you will need and want to know how many square meters that will be, you multiply prims by 4.37 (roughly) to arrive at the number of square meters. Once you have the number of square meters, you then multiply the number of square meters by L$2 per square meter per month to arrive at the monthly rent for a parcel. For purchasers at Ecstasy City, you multiply the number of square meters by L$18.13 to arrive at the purchase price.
Of course, the rent per sm per month figure does change, as do purchase prices. I hope this information was helpful.
