ConverterHub

Popcorn Calculator

See how much popped popcorn, oil, and salt you get from any amount of kernels.

Result

2.4 L
15 g
2 g

How it is calculated

All three results are fixed multiples of the kernel weight in grams (K). Popped volume: V = K × 0.04 litres, which is the tool's assumption of about 40 times expansion. Oil: K × 0.25 grams. Salt: K × 0.03 grams. Volumes are rounded to one decimal, and the oil and salt weights to whole grams.

Kernel weight must be greater than zero. These are planning rules of thumb, not measurements: expansion varies with kernel variety, freshness and moisture, and with how many kernels fail to pop. Because salt is rounded to whole grams, very small batches can show 0 g of salt.

Worked example

You pop 60 g of kernels. Popped volume: 60 × 0.04 = 2.4 L. Oil: 60 × 0.25 = 15 g. Salt: 60 × 0.03 = 1.8, which the tool rounds to 2 g. It reports 2.4 L of popcorn with 15 g of oil and 2 g of salt, about enough for a couple of bowls. For 10 g of kernels you would get 0.4 L, 3 g of oil and a rounded 0 g of salt.

Try this example →

Common mistakes

  • Entering kernels in cups or tablespoons. The field takes grams, so weigh the kernels first.
  • Treating the result as an exact yield. Old or dry kernels leave more unpopped, so plan a margin when feeding a group.
  • Reading the oil figure in millilitres. It is a weight in grams, and oil is lighter than water, so 15 g is a little more than 15 mL.
  • Seasoning a tiny batch by the rounded salt figure. A 0 g or 2 g result is rounded, so taste and add to preference.
  • Expecting the oil and salt to apply to microwave or air-popped methods. The oil figure is for stovetop popping.

About this calculator

Unpopped popcorn kernels expand roughly 30 to 45 times their original volume when popped, so a small amount of kernels goes much further than it looks — a standard estimate is that ¼ cup of kernels yields about 8 cups of popped popcorn, with oil scaled at roughly 1–2 tablespoons and salt at about ¼ to ½ teaspoon per ¼ cup of kernels, depending on how rich and salty the result is meant to be.

This expansion ratio comes from the physics of popping itself: superheated moisture trapped inside the kernel's hard shell flashes to steam and bursts the hull, and the ratio of raw to popped volume is remarkably consistent across batches of the same kernel type, which is why commercial popcorn vendors and recipe developers can scale a formula reliably from a snack-sized batch to a party-sized one.

Home cooks planning movie-night snacks, concession-stand and party caterers scaling up batches, and recipe writers converting between kernel weight and finished popcorn volume all use this ratio to avoid the common mistake of popping either far too little or far too much.

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