Do I email colleges about application mistake or no? PLEASE HELP

REPOST

Accidently for three of my activities, I put 36 weeks per year when one of them requires more, around 18 and the other two activities average about 27 weeks per year when accounting the previous years. Do I email the schools I applied to and apologize for my miscalculation? I thought all of them were weekly until I realized they were bi-weekly. Last two years, two of them were weekly, which is how I averaged it out with the biweekly weeks this year. Is this a grave enough mistake to email the colleges?