How much wool does a sheep produce?
A sheep's annual fleece typically weighs three to six kilograms in greasy weight, with fine-wool Merinos at the upper end for weight and value, and hill breeds like Scottish Blackface lower, often two to three kilograms of coarser, hairier wool. The figure depends on breed, age, nutrition, and time since last shearing, and it is always greasy weight, meaning the fleece as it comes off the sheep, complete with lanolin, dirt, and vegetable matter. The calculator on this page multiplies flock size by average fleece weight to give the total crop and the number of twenty-kilogram sacks it will fill.
Wool is a yearly crop with a yearly rhythm, and shearing day is the harvest festival of the sheep farm, whether the flock numbers five or five thousand. Planning starts long before the shearers arrive: crutching dirty wool from around the tail, checking that the shearing shed is clean and dry, and having enough wool packs, sacks, and ties ready, because a shearing team works fast and a farm that runs out of packs mid-day loses time it cannot buy back. The calculator's sack figure is the starting point for that ordering.
Breed and fleece weight
Merinos dominate fine wool production for good reason: a mature Merino ewe commonly cuts four to six kilograms of fine, dense fleece, and wethers, which are not diverting energy into pregnancy and lactation, often cut even more. Crossbred ewes, such as Romney and Coopworth types, give four to five kilograms of medium wool that suits knitwear and carpets, while longwool breeds like Lincoln and Leicester produce heavy, lustrous fleeces of five kilograms or more, prized for worsted spinning. Hill breeds produce less and coarser wool, but they produce it on land where nothing else thrives, which is their economic justification.
Age and sex shift the average in ways that matter when estimating a mixed flock. Lambs at their first shearing give a light fleece, often one to two kilograms, hoggets give more as they mature, and ewes in full production give the flock average, while old ewes decline. Rams often give the heaviest fleeces of all, sometimes seven kilograms or more, but there are few of them, so they barely move a flock total. Using one average for a mixed flock is fine for planning, provided the average is honest and based on last year's actual weights rather than a breed book's best case.
Nutrition: wool is grown, not just cut
Wool is almost pure protein, and a ewe that is short of protein grows less of it, with a visible break in the fibre where nutrition dipped, which spinners call a tender fleece and buyers discount. Good pasture through the growing season, supplemented with protein where pasture is poor, grows a heavier, stronger fleece, while a ewe that loses condition in late pregnancy will show it in the wool months later. Sulphur-containing amino acids are particularly important for wool growth, which is why protein quality matters as much as protein quantity, and why a ration balanced for wool includes more than just energy.
Shearing interval also affects the total, because wool grows roughly a centimetre a month, and a fleece shorn after twelve months is heavier than one shorn after eight, though not proportionally, since the tips weather and break. Twice-yearly shearing suits some breeds and climates, producing two lighter fleeces that may total more than one annual fleece, but it doubles shearing cost, which is the real calculation. For most flocks, annual shearing timed before lambing or before summer heat gives the best balance of weight, quality, and cost.
| Flock | Fleece per sheep | Total wool | Sacks (20 kg) |
|---|---|---|---|
| 20 sheep | 4.0 kg | 80 kg | 4 sacks |
| 50 sheep | 3.5 kg | 175 kg | 9 sacks |
| 5 sheep | 5.0 kg | 25 kg | 2 sacks |
| 100 sheep | 4.5 kg | 450 kg | 23 sacks |
| 200 sheep | 4.0 kg | 800 kg | 40 sacks |
Shearing day logistics
A good shearing day runs like a small factory: sheep caught and penned in order, shorn on a clean board, fleeces skirted and rolled, and wool classed into packs by quality, all without the fleeces touching mud or dung. Skirting, the removal of dirty belly wool, stained pieces, and dags, is what separates a saleable fleece from a discounted one, and it should be done on a slatted table where second cuts and dirt fall away. Rolling the fleece with the cut side out, into a neat bundle, protects it in the pack and impresses buyers, who judge a farm by its presentation.
Wool classing is a skill worth learning or hiring, because mixed wool sells for the lowest price in the bale. Separate fine from coarse, white from stained, and long from short, and keep ram fleeces, lamb fleeces, and belly wool apart, because each has a different market. Even a small flock benefits from basic separation, and a wool broker or classer can advise on what local buyers want, since the market for hand-spinning wool, for example, rewards exactly the small, well-presented lots that commercial buyers ignore.
Greasy, clean, and what buyers pay for
Buyers pay for clean wool yield, not greasy weight, and the conversion matters when comparing prices. A greasy fleece that is sixty percent clean wool after scouring is worth more per greasy kilogram than a dirty fleece at forty-five percent, because the buyer pays for scouring, waste disposal, and transport of dirt that was never wool. Breeds and management affect yield: sheep run on clean pasture with minimal dust produce higher-yielding wool, while sheep that sleep in muddy yards or eat dusty hay carry that contamination into the fleece.
Small flocks have options that large commercial flocks do not. Hand-spinners, felters, and craft buyers pay premium prices for well-prepared fleeces from named breeds, especially rare breeds and naturally coloured wool, which commercial mills rarely want. Selling fleeces individually, skirted and rolled, at a farmers market or online, can return several times the commercial wool price per kilogram, though it takes time and presentation. Even if the commercial price barely covers shearing, the fleece is still a product, and a flock that wastes it is leaving money on the shearing shed floor.
Wool beyond the jumper
Wool's uses extend far beyond clothing, and knowing them helps a small producer find a market. Wool insulation for houses uses lower-grade wool that would otherwise be discarded, wool pellets for gardens retain water and release nitrogen slowly, and lanolin from scouring goes into cosmetics and pharmaceuticals. Felted wool makes slippers, hats, and acoustic panels, and wool's natural flame resistance and odour management make it ideal for bedding and carpets. A producer who knows these outlets can sell grades that the clothing market rejects, instead of burning or burying them.
Storing wool properly protects its value between shearing and sale. Keep packs dry, off concrete floors, away from sunlight and moths, and never store wool in a damp shed where it can mildew, because mildewed wool is unsaleable and smells it. Label packs with breed, class, and shearing date, because a buyer who can trace wool to a farm and a flock will pay more and come back, and a farm with good records can prove its wool's story in a market that increasingly cares about provenance and animal welfare.
Shearing season checklist
- Estimate the crop and order enough packs, sacks, and ties in advance.
- Crutch and dag sheep before shearing for cleaner fleeces.
- Skirt, roll, and class fleeces on the day, not weeks later.
- Keep greasy weight records to set next year's average honestly.
- Store packs dry, labelled, and off the floor until sold.
Wool is a slow crop: a year of grazing, a day of shearing, and a fleece that carries the whole story of the season. Estimate the crop honestly, present it well, and sell it to the buyer who values it most.