miscalculation

US /ˌmɪs.kæl.kjəˈleɪ.ʃən/
UK /ˌmɪs.kæl.kjəˈleɪ.ʃən/
1.

tính toán sai lầm

a calculation that has not been done correctly, or the act of calculating something wrongly:

:
The project went over budget because of a miscalculation at the planning stage.