proračun

1. calculation; estimate
   Inženjer je uradio proračun za novi most. — The engineer did the calculations for the new bridge.
   Majstor nam je poslao proračun troškova. — The builder sent us a cost estimate.
2. (of behaviour) calculation; self-interest
   Nije se oženio iz ljubavi, već iz proračuna. — He didn't marry for love, but out of calculation.

For "budget" Serbian uses budžet; proračun in that sense is Croatian.