How many carbs should i eat a day if i'm prediabetic?

Counting Carbs: Your requirement of calories depends upon your ht, wt, activity level & your need to lose w. t. If you will reduce consumption of calories by 500 /day, in 7 days you will lose one pound. After your caloric requirement is calculated, half of those calories should come from carbs. Each gram of carb gives 4 cal. Fifteen gram of carb is considered one carb. 1600 Cal/2=800/4=200 gm /15=13 carbs/d