QUICK ANSWER
How many calories are in popcorn?
Popcorn provides 429 calories per 100 g in the selected USDA record for “Popcorn, microwave, low fat and sodium.” The same weight contains 12.6 g protein, 73.4 g carbohydrate, 9.5 g fat and 14.2 g fibre. By calculated energy contribution, carbohydrate is the leading macronutrient in this record.
THE SOURCE NUMBERS
Popcorn nutrition facts per 100 g
The five core values below come from USDA FoodData Central record 168139. They share the same 100 g edible-portion basis, so the calorie and macronutrient figures remain internally consistent.
CALCULATED PORTIONS
Calories at different gram weights
These are transparent calculations from the 429-kcal-per-100-g record—not claims that a spoon, piece or cup always weighs the same amount.
MACRO PROFILE
What the carbohydrate, protein and fat values mean
Carbohydrate is reported for the selected popcorn, microwave, low fat and sodium record. Fibre is included within total carbohydrate where the source reports it.
This is the protein amount in 100 g of the selected edible state. It should be compared with foods on the same weight basis.
Fat content can shift when oil, skin, sauces, draining, roasting or recipe ingredients differ from the reference description.
This record is comparatively fibre-rich by weight. Fibre values remain specific to this food state.
ONE CANONICAL FOOD PAGE
Reference state and related variants
Food records can change with preparation, water content, recipe, brand and the edible portion that was weighed. This page anchors its calculations to one selected record so unlike states are not silently mixed.
Popcorn, microwave, low fat and sodium
Chosen as the most common form of this food with all five core values: calories, protein, carbohydrate, fat and fibre.
SR Legacy · FDC 168139- Popcorn, microwave, low fat and sodium
- Popcorn, microwave, regular (butter) flavor, made with palm oil
- Popcorn, sugar syrup/caramel, fat-free
BETTER FOOD LOGGING
How to use this number accurately
- Match the state.Use this page only when “Popcorn, microwave, low fat and sodium” is a reasonable match for what was eaten.
- Use edible grams.Exclude bones, pits, shells, packaging and discarded liquid unless the source description includes them.
- Calculate the portion.Multiply edible grams by 4.3 to estimate calories from this exact record.
- Add recipe ingredients.Oil, sauces, breading, sweeteners, toppings and preparation losses require a recipe or separate entries.
RELATED GUIDES
Continue through the food library
SOURCE & EVIDENCE BOUNDARY
Where the nutrition values come from
Core nutrition values use USDA FoodData Central record 168139: “Popcorn, microwave, low fat and sodium.” The record type is SR Legacy, and values are shown per 100 g edible portion.
Nutrition databases describe reference samples. Natural variation, formulation, preparation and measurement can change an individual serving. This page provides general nutrition information, not medical advice or a food-safety duration.