Fiber Calculator Formula

Understand the math behind the fiber calculator. Each variable explained with a worked example.

Use the Fiber Calculator

Formulas Used

Dietary Fiber

fiber_g = food_weight_g * fiber_pct / 100

% of 28 g Daily Value

pct_daily_28g = (food_weight_g * fiber_pct / 100) / 28 * 100

Variables

VariableDescriptionDefault
food_weight_gFood Weight(g)100
fiber_pctFiber Content7

How It Works

How to Calculate Fiber Content

Formula

Fiber (g) = Food Weight (g) x Fiber Percentage / 100

Daily Recommendations

  • Women: 25 g per day
  • Men: 38 g per day
  • FDA Daily Value: 28 g

    • High-Fiber Foods

  • Chia seeds: 34 g per 100 g
  • Lentils: 7 g per 100 g cooked
  • Oats: 10 g per 100 g dry

    • Worked Example

    Calculate fiber in 100 g of cooked lentils.

    food_weight_g = 100fiber_pct = 7
    1. 01Lentil fiber content: 7 g per 100 g cooked.
    2. 02Fiber: 100 x 7/100 = 7 g.
    3. 03% of daily value: (7/28) x 100 = 25%.

    Ready to run the numbers?

    Open Fiber Calculator