How Many Square Bales Are in a Round Bale?

This question comes up every time someone switches bale formats, compares two hay quotes, or tries to work out whether a round bale is actually the better deal.

The short answer people usually get is "about twenty." That is close enough to be useful and wrong often enough to cost money.

The real answer depends on three things: the round bale's dimensions, how tightly it was rolled, and what your square bales weigh. Change any one of those and the number moves substantially.

This guide gives you the conversion chart, the three-step method to calculate it for your own bales, and the waste factor that changes what the number actually means in practice.

How Many Square Bales Are in a Round Bale?

A typical round bale holds the equivalent of 15 to 25 small square bales. A 1,000 lb round bale divided by 50 lb squares works out to 20 bales, which is where the common rule of thumb comes from.

But round bales range from roughly 450 lb to over 1,600 lb depending on size and density, and small squares range from about 40 to 75 lb. Across those ranges, the real answer spans anywhere from 9 to more than 30.

Here is the honest version: the question only has an answer once you know two weights. Round bale weight divided by square bale weight. Everything else is guessing.

The good news is that both numbers are easy to get, and knowing them protects you from overpaying on every hay purchase you make.

Why Isn't There One Fixed Number?

Because "round bale" describes a shape, not a quantity. Two bales called the same size can differ by hundreds of pounds.

Round bales are named by width × diameter. A 4x5 is four feet wide and five feet across; a 5x6 is five feet wide and six feet across.

Those dimensions change volume dramatically. UF/IFAS Extension reports that at a common reference point, a 4x5 bale holds about 80 percent of the volume of a 5x5, while a 5x6 holds about 144 percent — meaning a 5x6 contains roughly 44 percent more hay than a 5x5 at the same density.

Density is the second variable, and it is invisible from the outside. Round bale density typically ranges from about 9 to 12 pounds per cubic foot depending on the baler, its tension setting, the crop, and the operator.

That range matters more than people expect. The same 5x5 bale can weigh under 900 lb loosely rolled or over 1,150 lb rolled tight.

The third variable is your square bales. A "small square" is not a standard unit either — they commonly run between 40 and 75 lb depending on the baler settings and the crop.

How Much Does a Round Bale Weigh?

Round bale weight is volume multiplied by density. The table below shows calculated volumes for common sizes alongside the weight range you get across typical densities.

Bale size (W × D)	Volume	At 9 lb/ft³	At 10.5 lb/ft³	At 12 lb/ft³
4x4	50 ft³	~450 lb	~530 lb	~600 lb
4x5	79 ft³	~710 lb	~825 lb	~940 lb
5x5	98 ft³	~885 lb	~1,030 lb	~1,180 lb
4x6	113 ft³	~1,020 lb	~1,190 lb	~1,360 lb
5x6	141 ft³	~1,270 lb	~1,485 lb	~1,700 lb

Volumes calculated from cylinder dimensions. Density range per published forage industry figures. Actual weights vary with crop, moisture, and baler settings.

Notice the spread within a single row. A 5x5 bale can legitimately weigh anywhere from about 885 to 1,180 lb — a difference of nearly 300 lb, or roughly six small square bales.

This is exactly why UF/IFAS warns that buying hay on a bale-size basis rather than a weight basis can lead to overpaying for undersized bales.

How Much Does a Small Square Bale Weigh?

Small square bales generally run between 40 and 75 lb, with most horse hay falling somewhere in the 45 to 60 lb range.

Weight depends on the baler's tension setting, the length of the bale, the crop, and moisture at baling. Alfalfa bales are typically heavier than grass bales of the same dimensions because the material is denser.

If you have never weighed yours, do it once. Stand on a bathroom scale holding a bale, subtract your own weight, and you have a number you can use for years.

That single measurement makes every future hay comparison accurate instead of approximate.

Square Bale Equivalent: Full Conversion Chart

This table shows how many small squares a round bale replaces, using a mid-range density of 10.5 lb/ft³.

Round bale size	Approx. weight	@ 40 lb squares	@ 50 lb squares	@ 60 lb squares	@ 70 lb squares
4x4	~530 lb	13	11	9	8
4x5	~825 lb	21	17	14	12
5x5	~1,030 lb	26	21	17	15
4x6	~1,190 lb	30	24	20	17
5x6	~1,485 lb	37	30	25	21

Read across a single row and the number nearly halves between 40 lb and 70 lb squares. Read down a single column and it triples between a 4x4 and a 5x6.

That is the whole reason "about twenty" is unreliable. It happens to be correct for a 5x5 with 50 lb squares, and wrong for most other combinations.

How Do You Calculate It for Your Own Bales?

Three steps, and you only need to do it once per supplier.

Step 1 — Get the round bale weight. Ask the seller for an actual number, not a size. If they do not know, measure the bale and estimate: multiply π × (diameter ÷ 2)² × width to get cubic feet, then multiply by 10.5 for a mid-range density estimate.

Step 2 — Weigh a square bale. Bathroom scale, one time, done.

Step 3 — Divide. Round bale weight ÷ square bale weight = square bale equivalent.

Worked example: a 5x5 round bale weighing 1,030 lb, with square bales at 55 lb.

1,030 ÷ 55 = 19 square bales

That number is now yours to use for pricing, ordering, and storage planning — and it is accurate rather than assumed.

How Many Round Bales Does a Horse Eat Per Month?

Roughly one round bale per horse per month to one bale every six weeks, depending on bale weight and how much gets wasted.

Start from forage intake. A common planning figure is about two percent of body weight daily, which puts a 1,000 lb horse around 20 lb of hay per day.

Round bale weight	With a feeder (~5% waste)	Fed on open ground (~20% waste)
800 lb	Lasts ~38 days	Lasts ~32 days
1,000 lb	Lasts ~48 days	Lasts ~40 days
1,200 lb	Lasts ~57 days	Lasts ~48 days
1,500 lb	Lasts ~71 days	Lasts ~60 days

Based on one 1,000 lb horse at 20 lb of hay per day. Multiple horses divide these figures proportionally.

Alberta winters change this substantially. Once temperatures fall below a horse's lower critical temperature, energy requirements climb roughly one percent per degree Fahrenheit of additional cold — which can add several pounds of hay per horse per day during a cold snap.

Budget more bales for January and February than a summer calculation suggests. Our guide to calculating daily hay requirements walks through the full method.

Why Waste Changes the Real Answer

A round bale only equals twenty square bales if your horses actually eat all of it. Often they do not, and the gap is far bigger than most owners realize.

Research from the University of Minnesota found that feeding horses round bales without a feeder can waste up to 57 percent of the hay, alongside reduced intake and weight loss in the horses.

Read that number again in conversion terms. A 1,000 lb round bale that should replace twenty square bales delivers the equivalent of about nine if it is rolled out on open ground.

Storage losses stack on top of that. UF/IFAS reports storage loss ranging from about 5 percent for bales kept inside a building to 29 percent for bales left on the ground with no cover.

Combine worst-case storage and worst-case feeding and a round bale can deliver less than half of what its weight suggests. That completely inverts the economics that made it look cheaper.

The fix is straightforward: use a proper feeder, and store bales off the ground under cover. Both changes pay for themselves quickly at current hay prices.

How Should This Affect What You Pay?

Convert everything to price per pound before comparing. It takes thirty seconds and removes almost all the confusion in hay pricing.

A $150 round bale at 1,200 lb costs $0.125 per pound. A $110 round bale at 800 lb costs $0.1375 per pound. The cheaper-looking bale is the more expensive hay.

Small squares almost always cost more per pound, and that is not a markup aimed at horse owners. It reflects real labour — the same tonnage means handling twenty-odd individual bales instead of one, plus indoor storage.

For the full picture on what drives hay costs in this province, see our breakdown of Alberta hay prices, which includes official regional benchmark figures.

One more adjustment worth making: price on hay consumed, not hay purchased. A round bale fed without a feeder at $0.125 per pound is really costing closer to $0.29 per pound eaten.

Which Format Makes More Sense for an Alberta Acreage?

It depends on your equipment, your horse count, and your storage — not on which is cheaper per pound on paper.

Round bales make sense when you have a tractor or loader, several horses, a proper feeder, and somewhere to store bales off the ground. The labour saving is genuine and the per-pound cost is lower.

Small squares make sense when you have one or two horses, no loader, a shed or loft for storage, or you need to portion feed precisely for a horse on a controlled diet.

Portion control is the underrated factor. You cannot easily restrict intake with a round bale, which matters for easy keepers and metabolic horses.

Many Alberta acreages run both — round bales in a feeder for the general herd through winter, and squares on hand for individual feeding, travel, and horses needing something specific.

Our full comparison of round bales and small square bales covers handling, storage, and waste in more detail.

Whatever format you choose, check the hay itself before committing — our guide to spotting problems before you buy covers what to look for.

Getting Bale Weights You Can Actually Rely On

The most useful thing a hay supplier can give you is an honest bale weight. Everything downstream — pricing, ordering volume, storage planning — depends on it.

Horse Creek Hay & Feed grows and supplies forage from Rocky View County with delivery across much of Alberta. You can see what is available this season including both square bale and round bale formats.

If you are working out how much to order for the winter, contact our team with your horse count and bale format. We will give you actual weights and help you calculate the volume rather than leaving you to guess from a size label.

Conclusion

A round bale typically equals 15 to 25 small squares, with 20 being the common shorthand for a 1,000 lb round and 50 lb squares.

But the useful version is the division, not the rule of thumb. Get the round bale weight, weigh one of your squares, and divide — the answer for your hay will often be meaningfully different from the average.

Then adjust for waste. A round bale fed without a feeder can lose more than half its value before it reaches a horse, which changes the comparison completely.

Weigh once, convert everything to price per pound, and use a feeder. Those three habits will save more money over a winter than negotiating on price ever will.

Frequently Asked Questions

How many round bales equal one large square bale?

It depends entirely on the large square's dimensions, which vary widely — 3x3x8 and 4x4x8 are both common and differ substantially in volume. The same method applies: get both weights and divide. Large squares are usually priced and sold by weight in commercial trade precisely because size labels are unreliable.

Can I estimate a round bale's weight without a scale?

Yes, approximately. Measure the width and diameter, calculate the cylinder volume, and multiply by a density estimate around 10.5 lb per cubic foot. Expect the result to be within roughly 15 percent of actual, since density varies with crop, moisture, and baler tension — good enough for planning, not precise enough for pricing a large purchase.

Are round bales always cheaper than square bales?

Per pound purchased, usually yes. Per pound actually eaten, not necessarily — feeding waste can erase the advantage entirely if there is no feeder. Factor in handling equipment too, since round bales need a tractor or loader that small squares do not.

Why do two round bales of the same size weigh differently?

Density and moisture. Baler tension settings, crop type, how fast the operator ran the windrow, and moisture at baling all affect how much hay ends up in the same volume. Alfalfa is denser than grass, and a tightly rolled bale can hold several hundred pounds more than a loose one of identical dimensions.

How many square bales does a horse eat per month?

At roughly 20 lb of hay per day for a 1,000 lb horse and 50 lb square bales, that works out to about 12 bales per month. Increase that through cold weather, and adjust for your actual bale weight and your horse's body weight, workload, and hay quality.