The chempedak tree yield calculator estimates how many kilograms a tree and a whole planting will produce in a season, from tree age, health, fruit count and fruit size. It is built for home growers with a few trees and for smallholders planning a harvest, sale or processing run. The decision it removes guesswork from is capacity: how much fruit is coming, and whether you have the labour, buyers and storage to handle it.
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Chempedak (Artocarpus integer) is a fast-bearing relative of jackfruit that can start fruiting within three to four years and build to a substantial annual crop as it matures. Yield per tree climbs with age up to a plateau, then holds, and it swings with health, pollination and the fruiting habit of the cultivar.
The calculator multiplies a realistic fruit count by average fruit weight, adjusts for age and health, and scales to your number of trees. It also estimates the edible flesh behind the whole-fruit figure, which is the number a buyer or a kitchen actually cares about.
How to use the Chempedak tree yield calculator
Start with tree age in years. Young trees under four years yield little, while trees from roughly eight years bear near their mature potential. The calculator applies an age factor, so the same fruit count on a young tree reads lower than on a mature one, reflecting smaller fruit and lighter set.
Set tree health next. A vigorous, well-fed tree carries and holds more fruit than a stressed one, so health scales the estimate up or down. Be honest about pest pressure, drought or poor soil, because an optimistic health rating inflates the whole harvest figure.
Enter fruits per tree, ideally counted rather than guessed. If you can count developing fruit on a representative tree, the estimate becomes far more reliable than any generic average.
Count fruit on two or three typical trees and average them, rather than counting your best tree. A single heavy-bearing tree is not representative, and using it inflates the orchard total noticeably.
Set the average fruit weight in kilograms. Chempedak fruits commonly run 1 to 3.5 kg, so weigh a few if you can. Then enter the number of trees to scale to the whole planting, and pick the cultivar type, which shifts both fruit size and flesh fraction.
As you adjust, yield per tree and total orchard yield update together, and the estimated flesh yield tracks below them so you can see the saleable weight behind the gross tonnage.
Calculator fields explained
Tree age (years) – the age of the tree. Default 8, step 1. Applies an age factor that rises to a mature plateau.
Tree health – a select from poor, fair, good to vigorous. Default good. Scales yield up or down for vigour and stress.
Fruits per tree – counted or estimated developing fruit per tree. Default 40, step 1. The main driver of the estimate.
Average fruit weight (kg) – typical fruit mass. Default 2.0 kg, step 0.1. Multiplies fruit count into weight.
Number of trees – trees in the planting. Default 1, step 1. Scales to orchard total.
Cultivar type – a select of named cultivars and a generic seedling. Default seedling. Adjusts fruit size and the flesh fraction used for edible yield.
Understanding the results
| Result | What it means | What action it drives |
|---|---|---|
| Yield per tree (kg) | Whole-fruit weight from one tree | Per-tree planning and comparison |
| Total orchard yield (kg) | Whole-fruit weight from all trees | Labour, transport and sales planning |
| Estimated flesh yield (kg) | Edible aril weight behind the total | Pricing and processing decisions |
| Annual yield trend | Whether yield is rising, plateaued or declining with age | Long-term orchard planning |
Total orchard yield is the hero number for a smallholder, because it sizes the whole job. Knowing that ten mature trees will drop, say, six tonnes of fruit tells you whether you need extra pickers, a truck and buyers lined up before the fruit ripens all at once.
Yield per tree lets you compare trees and spot underperformers. A mature tree well below its cohort points to a health, pollination or soil problem worth investigating before the next season.
Ten mature trees can drop several tonnes in one short season.
Estimated flesh yield is what turns tonnage into money. Since only about a third of whole weight is edible, a six-tonne gross crop is roughly two tonnes of flesh, and that flesh figure is what a wholesale buyer or a processing plan is built on.
Do not commit to sales or processing volumes on gross fruit weight. Selling promises made on tonnes of whole fruit will fall short once seed and rind are removed, and the shortfall is roughly two thirds.
The annual yield trend flags where the tree sits in its life. A young tree reading a rising trend will out-yield this season’s figure next year, which matters for anyone planning capacity a few seasons ahead. A very old tree may show a declining trend, signalling replacement.
Reading the extremes: an implausibly high per-tree figure usually means an over-counted fruit number or an optimistic weight, so cross-check against a weighed sample before trusting it.
Calculation formulas
Yield builds from count and weight, adjusted by age and health:
Yield per tree = fruits per tree x average fruit weight x age factor x health factor
Total orchard yield = yield per tree x number of trees
Estimated flesh yield = total yield x cultivar flesh fraction
Worked walkthrough
Take an 8-year tree, good health, 40 fruits, 2.0 kg each, seedling. With an age factor of 1.0 at maturity and a good-health factor of 0.9: yield per tree is 40 x 2.0 x 1.0 x 0.9 = 72 kg. For 10 trees, total is 720 kg. At a 0.33 flesh fraction, flesh yield is 720 x 0.33 = 238 kg.
The age factor is what separates a young orchard’s promise from a mature one’s output. A four-year tree at the same fruit count and weight yields far less, because its age factor is well below one and its fruit tends to run smaller.
The parameters below feed every figure. Match them to the shipped code and your own weighed samples.
| Parameter | Illustrative value | Unit |
|---|---|---|
| Age factor at 4 years | 0.35 | factor |
| Age factor at 8+ years | 1.0 | factor |
| Health factor, good | 0.9 | factor |
| Health factor, vigorous | 1.1 | factor |
| Default fruits per tree | 40 | fruits |
| Default fruit weight | 2.0 | kg |
| Flesh fraction (seedling) | 0.33 | share |
Age to yield reference
| Tree age (years) | Stage | Relative yield |
|---|---|---|
| 3 to 4 | First bearing | Low |
| 5 to 7 | Building | Rising |
| 8 to 25 | Mature | Full |
| 25+ | Declining | Falling |
Practical examples
Backyard single tree. Inputs: 6 years, good, 20 fruits, 2.0 kg, 1 tree, seedling. Yield about 20 x 2.0 x 0.7 x 0.9 = 25 kg. Next step: plan for household use and gifting, no buyer needed.
Young orchard. Inputs: 4 years, good, 15 fruits, 1.8 kg, 20 trees. Per tree about 8.5 kg, total 170 kg. The grower notes the crop will grow sharply over coming seasons.
Mature smallholding. The walkthrough: 10 trees, 720 kg gross, 238 kg flesh. The grower lines up a wholesale buyer for the flesh weight.
Vigorous named cultivar. Inputs: 10 years, vigorous, 50 fruits, 2.5 kg, 10 trees, named cultivar at 0.40 flesh. Per tree 50 x 2.5 x 1.0 x 1.1 = 137 kg, total 1375 kg, flesh 550 kg. A vigorous mature planting yields over half a tonne of flesh.
Weigh a random sample of ten fruits at harvest and compare the average with what you entered. If your real average is 2.4 kg and you planned on 2.0, your whole crop is 20 percent larger than you arranged buyers for.
Stressed trees. Inputs: 8 years, poor health, 40 fruits, 1.8 kg, 10 trees. A poor-health factor near 0.6 cuts per tree to about 43 kg, total 430 kg. The grower treats the cause before the next season.
Processing plan. Inputs give 300 kg flesh. The grower sizes a freezing and packing run to 300 kg, ordering bags and freezer space to match.
Off year. Chempedak can bear unevenly year to year. In a light year the grower halves the fruit count input and finds the crop barely covers fixed costs, so plans to hold cash from heavy years.
Disease edge case. A fruit-rot outbreak spoils a third of set fruit. The grower reduces effective fruit count by a third, sees flesh yield fall accordingly, and diverts the sound fruit to immediate fresh sale rather than storage.
Tips and best practices
Count fruit on several representative trees, not your best one. An average across typical trees gives an orchard total you can actually plan against, while the star tree flatters the estimate.
Weigh a fruit sample each season and update your average weight. Fruit size drifts with rainfall and tree age, and a stale weight assumption is one of the largest sources of error in the whole estimate.
Feed and water trees on schedule to hold the health factor high. The gap between a stressed and a vigorous tree is large enough that management, not luck, sets most of the difference in yield.
Plan for the flesh figure, not the gross tonnage, when arranging sales. Buyers pay for saleable flesh, and promising on whole weight sets you up to under-deliver by roughly two thirds.
Keep a simple per-tree yield log across seasons. Over a few years it shows which trees consistently underperform, which is the fastest way to decide what to prune hard, feed more, or replace.
Expect uneven bearing between years and hold reserves from heavy seasons. Chempedak does not yield the same every year, so budgeting on an average rather than a peak protects you in the light years.
⚠️ Common mistakes to avoid
Counting only the best tree
Extrapolating the whole orchard from one heavy-bearing tree overstates the crop.
If your best tree carries twice the average, an orchard total built on it will be double the real harvest, and you will arrange buyers or storage you cannot fill.
Average several typical trees instead.
Planning sales on gross weight
Whole fruit weight is not saleable flesh. Two thirds of the gross tonnage is seed and rind. Base commitments on the flesh yield figure.
Using a stale fruit weight
Fruit size changes with season and tree age. An out-of-date average weight can throw the whole estimate off by a fifth, so weigh a sample each year.
Overrating tree health
An optimistic health rating inflates the estimate. Rate honestly against pest pressure, feeding and water, because the health factor scales everything.
Ignoring alternate bearing
Expecting the same yield every year misjudges a fruit that bears unevenly. Budget on an average across years, not last season’s peak.
Do not lock in a fixed annual supply contract on a single heavy year’s yield. A light year can fall well short, and you will be buying fruit in to cover the gap.
Contract on a conservative average and treat surplus in heavy years as upside.
Forgetting young-tree ramp-up
Sizing infrastructure to a young orchard’s current small crop misses the sharp rise ahead. Plan capacity for the mature yield the age trend points to.
When to use this calculator
Use it before harvest to size labour, transport and storage, when arranging sales so you promise a deliverable flesh weight, and when planning a processing run that needs a known input volume. Each of these depends on a realistic yield the tool provides.
It also guides longer decisions. Comparing per-tree yields across an orchard shows which trees to feed, prune or replace, and the age trend informs whether to plant more now for capacity a few seasons out.
For a new grower, it turns a vague hope of a good crop into a number that can be checked against a weighed sample at harvest, which builds a reliable planning record over time.
A harvest you did not size in advance arrives all at once, and chempedak ripening on schedule with no pickers, no truck and no buyer is fruit that rots on the ground.
It is not worth opening for a single backyard tree whose crop you will simply eat and give away, where the exact tonnage changes nothing you do.
Related calculators
Chempedak Flesh Yield Calculator, Chempedak Nutrition Calculator, Chempedak Goreng Cost Calculator, Chempedak Ripeness Calculator, Chempedak Planting Density Calculator, Chempedak Pricing Calculator.
Glossary
Yield per tree – the whole-fruit weight a single tree produces in a season.
Orchard yield – the combined yield of all trees in the planting.
Flesh yield – the edible aril weight behind the gross figure.
Age factor – the multiplier reflecting how yield rises with tree age.
Health factor – the multiplier for tree vigour and stress.
Alternate bearing – the tendency to crop heavily one year and lightly the next.
Fruit set – the number of flowers that develop into fruit.
Why does a young tree yield so little even with fruit on it? Its age factor is low and its fruit runs smaller, so the same count of fruit weighs far less than on a mature tree.
Mature plateau – the age range where yield holds near its peak.
Cultivar – a named, propagated selection with consistent yield traits.
Seedling – a seed-grown tree with variable yield.
Vigour – the overall growth strength of a tree.
Gross tonnage – total whole-fruit weight before flesh recovery.
❓ Frequently asked questions
How much fruit does a mature chempedak tree produce?
On illustrative figures, a healthy mature tree can yield roughly 70 to 140 kg of whole fruit in a season, depending on cultivar and vigour.
That gross figure hides the flesh yield, which is about a third of it, so a 100 kg tree gives around 33 kg of edible arils.
When does a chempedak tree start bearing?
Grafted trees often begin within three to four years, seedlings a little later.
Yield stays low for the first bearing years and builds to full output around eight years, which the age factor reflects.
Why is my flesh yield so much lower than the total?
Because only about a third of whole fruit weight is edible aril; the rest is seed and rind.
This is why sales and processing plans should be built on flesh yield, not gross tonnage.
A named small-seeded cultivar recovers a somewhat higher fraction.
How do I get an accurate fruit count?
Count developing fruit on two or three typical trees and average them.
Avoid counting only your best tree, which overstates the orchard total.
Does the tree yield the same every year?
No. Chempedak tends to bear unevenly, with heavier and lighter years.
Plan on an average across seasons and hold reserves from heavy years to cover light ones.
What lowers my yield the most?
Poor tree health from drought, pests or weak feeding has a large effect, as does poor pollination.
The health factor can cut a tree’s output by a third or more, so management matters greatly. Stress can strip a third off a tree’s crop.
Should I weigh fruit or trust the default?
Weigh a sample. Fruit size varies with season and cultivar enough that the default can be off by a fifth.
A weighed average each year keeps the whole estimate honest.
How many trees do I need for a tonne of flesh?
At roughly 33 kg of flesh per mature tree, about 30 mature trees give a tonne of flesh in a normal year.
A vigorous named cultivar reduces that count, since it yields more and recovers more flesh per fruit.
⚖️ Disclaimer
This calculator provides educational and agricultural planning information only. Yield coefficients are illustrative, and real output depends on cultivar, soil, climate, pollination and management.
Estimates are planning tools, not guarantees. Weather, pests and alternate bearing can move a real harvest well above or below the figure shown.
Any financial planning built on these yields is not investment advice, and flesh yields used for sales should be confirmed against weighed samples.
Verify assumptions against your own orchard records and local extension or agronomy advice before committing to sales contracts, labour hire or processing investment.
