1) Be wrong about 2) Calculate incorrectly 3) Get the wrong idea about 4) Judge incorrectly 5) Misapprehend 6) Misestimate 7) Misinterpret 8) Misjudge 9) Mistake 10) Overestimate 11) To calculate incorrectly 12) Underestimate 1) Err 2) Misestimate 3) Misjudge 4) Undervalue 
• (v. t. & i.) To calculate erroneously; to judge wrongly.
Mis·cal'cu·late transitive verb & i. To calculate erroneously; to judge wrongly. -- 
[v] - judge incorrectly 2. [v] - calculate incorrectly