How to Say "cost-effective" in Spanish
The Spanish word for “cost-effective” is “rentable” — B1 level. This is a very common word in everyday Spanish.

Examples
Este pequeño negocio de café es muy rentable.
This small coffee business is very profitable.
Invertir en paneles solares es rentable a largo plazo.
Investing in solar panels is cost-effective in the long run.
La empresa cerró porque la fábrica ya no era rentable.
The company closed because the factory was no longer profitable.
One Form for Everyone
This word is 'gender-neutral.' Whether you are describing a masculine word (un negocio) or a feminine word (una empresa), 'rentable' stays exactly the same.
Using 'Ser' vs 'Resultar'
Use 'ser rentable' to describe a permanent state of profit, and 'resultar rentable' to say that something 'turns out' to be profitable after you do the math.
The 'Rent' Trap
Mistake: “Using 'rentable' to mean a house is available for rent.”
Correction: In Spanish, 'rentable' only means profitable. If you want to say a house can be rented, use 'alquilable'.
Related Translations
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