miscalculate (v.)

• deviate
• discount
• disregard
• err
• lapse
• misconstrue
• miscount
• misestimate
• misinterpret
• misjudge
• misread
• misunderstand
• overestimate
• overlook
• overrate
• overvalue
• slip
• stray
• stumble
• trip
• underestimate
• underrate
• undervalue
• wander