How to Use Vitamin A Calculator
Vitamin A Calculator is built to estimate vitamin A intake from selected foods and gram amounts using per-100-gram vitamin A values. Focus first on the inputs that directly drive the calculation:
- Enter the core measurement — Choose up to three vitamin A food sources from the dropdowns.
- Check units and options — Enter the gram amount eaten for each selected food.
- Read the primary result — Leave an amount at 0 if that row should not contribute.
- Review supporting values — Review total vitamin A and each food contribution.
Formula & Theory - Vitamin A Calculator
Vitamin A Calculator uses this core formula:
total_vitamin_A_mcg_RAE = Σ(food_vitamin_A_mcg_per_100g × grams_eaten ÷ 100)The Vitamin A Calculator uses fixed food-composition examples to show how portion size changes intake. Foods such as liver, carrots, sweet potato, spinach, eggs, and milk have very different vitamin A density.
The result is an estimate. Retinol activity equivalents, food preparation, fortification, serving measurement, and supplement use can change real intake.
Before interpreting Vitamin A Calculator, confirm food amounts are entered in grams and that supplement vitamin A is not accidentally mixed into food-only totals.
Use Cases for Vitamin A Calculator
Vitamin A Calculator is most useful in these situations:
- Comparing vitamin A sources in a meal.
- Nutrition education for portion size.
- Checking whether a food diary approaches a reference target.
- Showing why liver contributes much more than many vegetables.