Buying seed corn this spring and wondering how many seeds a bag actually holds? With field corn, how many seeds in a bag of seed corn comes down to one industry number. I rely on it every planting season here in Kansas.

A bag of seed corn holds 80,000 seeds (kernels). That count, not the weight, is the industry standard unit. Companies like Bayer and Corteva sell field corn by kernel count, so a single bag plants about 2.5 acres.

How Many Seeds in a Bag of Seed Corn?

A bag of seed corn holds 80,000 kernels. That has been the industry standard unit for years. Field corn sells by seed count, not by the pound. So whether you buy DeKalb, Pioneer, or a regional conventional brand, one unit means 80,000 seeds.

This count exists for a good reason. Farmers plant by population, meaning seeds per acre. A fixed kernel count lets you order the exact number of seeds your acreage needs. Weight would only muddy that math, since kernel size swings a lot from lot to lot.

You can tell food-grade corn and treated seed apart fast. Want a closer look at the coated, colored kernels in the bag? Here is what seed corn looks like up close.

Why Seed Corn Sells by Count, Not Weight

Seed companies sell corn by count because kernel size varies too much to trust weight. Two bags can hold the same 80,000 kernels and still weigh very differently. A bag of small flats might weigh about 35 pounds. A bag of large rounds can hit 55 to 59 pounds. Same seed count, very different scale reading.

Here is what drives that. A single ear grows several kernel shapes. Large rounds come from the base of the cob. Flats come from the middle. Small flats and small rounds come from the tip. If you have ever counted the kernels on a single ear, you have seen all those shapes on one cob.

Years back, farmers bought specific shapes to match their planter plates. Vacuum and pressure planters changed that habit. Now most growers just want bags close to the same weight, so they cut down on planter adjustments between lots.

How Much Does a Bag of Seed Corn Weigh?

A bag of seed corn weighs between 35 and 65 pounds. The exact weight depends on the seed size grade inside. The kernel count stays fixed at 80,000, but heavier kernels push the bag weight up.

Seed companies grade kernels by size and shape, then label the bag weight for that grade. Bayer, for example, sorts seed into five common sizes. Here is roughly how the weight tracks with each grade.

Seed grade	Approx. bag weight at 80,000 kernels
Medium flat	~34.5 lb
Medium flat (AF)	~40 lb
Medium round (AR)	~43 lb
Large flat (AF2)	~48.5 lb
Large round (AR2)	~59 lb

None of this changes your harvest. The genetics in a large round and a small flat off the same hybrid are identical.

How Many Acres Will One Bag of Seed Corn Plant?

One bag of seed corn plants about 2.5 acres. That assumes a planting population near 32,000 seeds per acre, which is common across the Corn Belt. Drop the population and a bag stretches further.

The math is simple. Divide 80,000 kernels by your seeds per acre. At 28,000 per acre, one bag covers about 2.86 acres. At 32,000, it covers 2.5 acres. At 36,000, it covers about 2.22 acres. Higher populations burn through seed faster.

Most current university guidance puts harvest populations between 26,000 and 36,000 plants per acre, depending on soil and moisture. Getting your population right starts with dialing in plant spacing for your row width and field conditions.

How to Figure Out How Many Bags You Need

To find the bags you need, multiply your acres by your seeding rate, then divide by 80,000. That gives you the bag count for the whole field. Round up, so you do not come up short on the last pass.

Here is a worked example. Say you plant 100 acres at 32,000 seeds per acre. Multiply 100 by 32,000 to get 3,200,000 seeds. Then divide that by 80,000 and you get 40 bags. The same field at 28,000 per acre needs 35 bags.

Always pad the order a little. Replant spots, planter waste, and skips happen. I keep an extra bag or two on hand. A washed-out corner should not send me back to the dealer.

What About Seed Boxes, Totes, and Bulk Corn?

A bulk seed box holds the equivalent of 50 bags, or 4 million kernels. These large plastic boxes feed central-fill planters through an auger and seed tender. The 80,000-kernel unit still applies, just packaged at scale.

Pricing works off that same unit. If a hybrid runs $300 per bag, a 50-bag box costs $15,000. Buying in bulk saves handling time on big acres. For a small plot, though, bags or even a half unit make more sense. A backyard grower planting in blocks for solid pollination rarely needs a full 80,000-kernel unit.

How Many Seeds in a Bag of Sweet Corn?

Sweet corn is different. It usually sells by weight or by smaller seed counts, not by the 80,000-kernel field corn unit. A one-pound bag holds roughly 1,900 to 4,200 seeds, depending on the variety.

Seed size drives that range. Supersweet (sh2) types have small, shrunken kernels that weigh less, so you get more per pound. Sugary enhanced (se) and normal sugary (su) types run heavier with fewer seeds per pound. Silver Queen, for instance, sits near 1,900 seeds per pound.

For a garden, you will see packets instead of bags. A typical sweet corn packet holds about 250 to 300 seeds. A one-ounce packet sows roughly a 75-foot row at one seed every 6 inches.

Does Seed Size or Count Affect Your Yield?

No, seed size does not affect genetic yield potential. Every kernel on an ear carries the same genetics, whether it is a large round or a small flat. Research from Bayer, Purdue, and Iowa State has confirmed this across many trials.

What actually drives yield is placement, population, and management. Plant at the right depth into the right soil temperature. Match your population to your soil’s productivity. Strong stands and good fertility do far more for the ears each stalk carries than kernel size ever will.

One practical note. If you switch seed grades mid-field, check your planter’s metering. A vacuum planter set for large rounds may double or skip on small flats.

What a Bag of Seed Corn Costs in 2026

In 2026, a bag of seed corn runs from about $85 for conventional non-GMO seed. Premium traited hybrids reach $250 or $300 and up. That works out to roughly $111 to $216 per acre for most growers, based on current cost data.

Seed is now one of the biggest input costs in corn. USDA figures show seed eating close to 25 percent of operating costs on many corn farms. Bayer and Corteva together supply more than half the U.S. corn seed market, which keeps trait pricing high.

Because seed costs this much, do not waste leftover bags. Stored right, leftover seed can carry into next year. So it pays to know how long your seed corn stays viable before you plant again.

How I Order Seed Corn for My Kansas Fields

When I order seed for my fields, I start with the 80,000-kernel unit and work backward. I set a target population for each field, multiply by acres, divide by 80,000, then add a small cushion. That keeps me from over-ordering on my lighter ground or running short on my best bottoms.

Hold onto the core number. A bag of seed corn holds 80,000 kernels and weighs 35 to 65 pounds. At a normal population, it plants about 2.5 acres. Get that straight, and your ordering, planting rate, and budget all line up.