Enter your sex, height, age, weight, and activity level into the calculator below to determine the recommended number of carbs needed per day.

Daily Carbs Formula

The following formula is used to calculate the total number of daily carbs you may require for a healthy balanced diet.

C = ((W*10/2.20452)+(6.25*h/.393701)+(5*a)+sc+6)*.40/4

  • Where C is the daily carbohydrate requirement (grams)
  • W is your weight (lbs)
  • H is your height (in)
  • a is your age (years)
  • sc is a constant based on your sex

Daily Carbs Definition

This formula is a little dense, so we will break it down a little further. The first step in calculating your daily carb intake is determining your daily calories needed. This can be done through a number of formulas, but most end up with a very similar result. In this case, we use a BMR formula (basal metabolic rate).

Then we take that total calorie and multiply it by .40 (40%). 40% is a good recommendation for the total calories needed to be from carbohydrates in order to have a healthy diet. Then, you divide that number by 4 to get grams of carbs. This is because each gram of carbohydrate has 4 calories of energy.