Overview: two numbers, not one
When you plan an edible-oil project, the first question is almost always “how much oil will I get from a tonne of seed?” The honest answer has two parts. First there is the oil content of the seed — the percentage of oil locked inside the clean kernel. Second there is the recoverable yield — how much of that oil your process can actually pull out. These two numbers are never the same, and confusing them is the most common mistake in early plant planning.
This reference gives typical, indicative oil-content ranges for the oilseeds most often processed for commercial vegetable oil, then explains how to translate content into the yield you can really expect. Every figure here is a typical range drawn from established process knowledge; the true value for your seed depends on variety, maturity, moisture, cleanliness and how well it is prepared before extraction.
Why does this matter so much in practice? Because plant equipment, working capital and your customer commitments are all sized on tonnes of oil per day, not on a textbook percentage. A planner who assumes a 45%-oil seed yields 45% oil will over-order tankage, over-promise output and under-budget for the cake that leaves the press. Getting the content-versus-yield relationship right at the planning stage is the difference between a plant that meets its numbers and one that quietly disappoints from day one. The sections that follow walk through the seed-by-seed content figures, then the two extraction routes that turn those figures into real, bankable yield.
Read this first: Oil content tells you the ceiling. Your process — pressing, solvent extraction, or both — decides how close to that ceiling you get. Always size a plant on recoverable yield, never on raw oil content.
Typical oil content by oilseed
The table below is the citable centrepiece of this guide: indicative oil content as a percentage of clean, dry seed or kernel. Treat each as a typical range, not a guaranteed value. Oilseeds with a wide range (corn germ, flaxseed) are especially sensitive to variety and pretreatment.
| Oilseed | Typical oil content (% of clean seed/kernel) | Notes |
|---|---|---|
| Soybean | ~18–20% | Low oil, high protein; almost always solvent-extracted at scale. |
| Rapeseed / Canola | ~40–44% | High oil; common pre-press then solvent route. |
| Sunflower | ~40–45% | Dehulled kernel runs higher; hull lowers whole-seed figure. |
| Peanut / Groundnut | ~45–50% | High-value; often full-pressed for cold or first-press oil. |
| Sesame | ~45–55% | Premium oil; small-batch pressing is common. |
| Cottonseed | ~18–25% | Linted/delinted seed; needs careful pretreatment. |
| Rice bran | ~16–22% | Must be stabilised quickly; usually solvent-extracted. |
| Corn germ | ~30–50% | Wide range by separation method (wet vs dry milling). |
| Copra (dried coconut) | ~60–65% | Among the highest; typically full-pressed. |
| Palm kernel | ~45–50% | Kernel only, separate from palm fruit (mesocarp) oil. |
| Flaxseed (linseed) | ~35–45% | Variety-sensitive; pressed for food or industrial oil. |
| Safflower | ~30–35% | Hull lowers whole-seed content. |
| Mustard | ~28–32% | Closely related to rapeseed but typically lower. |
| Castor | ~45–50% | Industrial (non-food) oil; specialised handling. |
Reading the table, you can see oilseeds fall into rough bands: low-oil/high-protein seeds near 18–25% (soybean, cottonseed, rice bran), mid-range seeds around 28–45% (mustard, safflower, flaxseed, rapeseed, sunflower), and high-oil kernels at 45–65% (peanut, sesame, palm kernel, castor, copra). The processing route you choose tends to follow this band — more on that below.
Content versus recoverable yield
Here is the distinction that decides your real output. The oil inside a seed does not all come out. Some of it stays bound up in the press cake or extracted meal, and a little is always lost as small process losses (fines, moisture handling, refining). So:
Oil content
The oil physically present in the clean seed, as a percentage of seed mass. The theoretical maximum.
Residual oil
Oil left behind in the cake or meal after extraction. Depends entirely on the method.
Process losses
Small, unavoidable losses in handling, dehulling, moisture control and refining.
Recovered yield
What you actually collect: oil content − residual oil − process losses.
The simple mental model is: recovered yield ≈ oil content − residual oil left behind − small process losses. The residual term is by far the biggest lever, and it is set by whether you press, solvent-extract, or do both. These are all typical, indicative figures — your actual recovery will differ.
Residual oil in mechanical pressing
Mechanical pressing squeezes oil out under pressure. It is simple, food-friendly and needs no solvent, but it cannot empty the seed — some oil always remains in the cake. How much depends on how hard the seed is pressed:
A good single-stage full press (screw press) can drive residual oil in the cake down to roughly 6–10%. That means from a seed at, say, 45% oil content, you might recover on the order of 35% of the seed mass as oil, with the rest staying in the cake or lost. A pre-press is deliberately gentler — it removes only part of the oil (leaving ~16–20% in the cake) so the partly de-oiled cake can then go to solvent extraction. Pre-pressing is normal for high-oil seeds because pushing 45%+ oil through a single full press is hard on equipment and on throughput.
To understand why pressing leaves oil behind and how seed preparation changes the result, see how a screw oil press works and how oilseed pretreatment works. Good cooking, conditioning and flaking before the press is one of the biggest levers on residual oil.
Video: an oil press extracting oil in our workshop.
Yield from solvent extraction
Solvent extraction washes oil out of prepared seed (or pre-press cake) with a food-grade solvent, then recovers the solvent for re-use. Its great advantage is completeness: a well-run solvent plant leaves under ~1% oil in the meal. In practice that means recovered yield sits very close to the seed’s full oil content, minus only small process losses.
Why low-oil seeds go straight to solvent: Soybean at ~18–20% oil simply does not have enough oil to press economically — a press would leave a large share of an already small amount in the cake. Solvent extraction recovers nearly all of it, which is why soybean, rice bran and similar low-oil seeds are almost always solvent-extracted, often without a press at all.
High-oil seeds frequently use a hybrid: pre-press to recover the bulk of the oil mechanically, then solvent-extract the cake to clean up the rest. This captures the best of both routes — the gentle mechanical stage removes most of the oil without straining a single press, and the solvent stage scavenges the remainder so very little is wasted. For a full side-by-side, read how solvent extraction works and pressing versus solvent extraction.
One practical caution: higher recovery is not automatically the right choice for every project. Solvent extraction adds capital cost, footprint and safety and regulatory requirements that small or premium-oil operations may not want. Many specialty producers of sesame, peanut or cold-pressed oils deliberately accept the higher residual of a full press because the press-only product commands a better price and a simpler operation. The right answer balances recovered yield against capital, scale, product positioning and the value of the cake you sell alongside the oil.
What moves the real number
The ranges above are starting points. Several real-world factors push your actual recovery up or down, and ignoring them is how plans miss their targets:
- Seed quality and maturity: immature, broken or weathered seed carries less oil and extracts less cleanly than sound, mature seed.
- Moisture content: too wet or too dry, and both pressing and extraction lose efficiency; conditioning to the right moisture is essential.
- Cleanliness: dust, stones and foreign matter dilute the feed and wear equipment, lowering effective yield per tonne.
- Pretreatment quality: proper cleaning, dehulling, cracking, cooking and flaking can move residual oil by several points — often the single biggest controllable lever.
- Hull content: whole-seed figures (sunflower, safflower, cottonseed) are lower than kernel figures because the hull carries little or no oil; dehulling raises the effective content of what you actually press or extract.
Because of all this, treat every percentage in this guide as typical and indicative. Validate against your own seed and process before committing capital. The cheapest way to do this is a small bench or pilot extraction on a representative sample of the actual seed you intend to buy, measured under your own moisture and pretreatment conditions. A single lab figure for your real feedstock is worth more than any published range, because it already folds in the variety, growing season and handling that this guide can only describe in general terms.
Worked example: from seed to oil
Take 1 tonne (1,000 kg) of a seed with a typical oil content of 45% — so 450 kg of oil is physically present. The route you choose decides how much you keep. These numbers are illustrative, indicative estimates only.
| Route | Residual oil left behind | Approx. oil recovered (per tonne) |
|---|---|---|
| Full press (screw press) | ~7% of seed mass in cake | roughly (45 − 7)% ≈ ~38% → ~380 kg |
| Pre-press only | ~18% of seed mass in cake | roughly (45 − 18)% ≈ ~27% → ~270 kg |
| Solvent extraction (or pre-press + solvent) | <1% in meal | close to full 45% → ~440–450 kg (minus small losses) |
The logic is the worked rule from earlier: a full press recovering down to about 7% residual gives roughly (oil content − 7)% of seed mass as oil; solvent extraction gives close to the full oil content. A pre-press deliberately recovers less because its job is to feed the solvent stage, not to finish the job alone. Subtract a little more for real process losses in every case.
To turn these per-tonne figures into daily plant tonnage, oil output and cake output, use the capacity calculator. To pick the right seeds for a commercial line in the first place, see best oil seeds for commercial production.
Planning a plant around a specific seed? Our engineering team can take your seed, target capacity and quality goals and translate typical oil content into a realistic recovered-yield estimate and a matched pressing or extraction line. Start with the capacity calculator or browse the free plant design tools — all figures indicative until validated against your seed.