estimation
US /ˌes.təˈmeɪ.ʃən/
UK /ˌes.təˈmeɪ.ʃən/

1.
a judgment or opinion about the worth, value, or quality of something or someone
:
•
In my estimation, the project will be completed on time.
•
He holds her in high estimation.
2.
the process of calculating or judging the size, amount, or nature of something without measuring it exactly
:
•
The architect provided an estimation of the construction costs.
•
Accurate estimation is crucial for project planning.