Free Gardening & Crops tool
Free Gardening & Crops toolVegetable Yield Calculator
The Vegetable Yield Calculator estimates total vegetable harvest yield in pounds from garden row footage and crop productivity averages. Garden yield tables are written two ways - pounds per plant or pounds per hundred feet of row - and neither converts easily into the kilograms and grams per square metre that recipes, market stalls and crop records use. Enter your stand and harvest to get gross and marketable weight, kilograms, and yield density.
Vegetable Yield Calculator: result
Basis: 1 lb = 0.45359 kg, 1 ft² = 0.092903 m². Row-yield tables are often written per 10 ft of row - multiply by 10 to reach the per-100-ft figure this calculator expects.
At a glance
- What it does: Per-plant or per-row yield becomes pounds, kilograms and grams per square metre.
- Who it is for: For weighing a home harvest or comparing beds, seasons and layouts honestly.
- Typical result: 20 plants at 5 lb with 85% marketable gives 85 lb, 38.6 kg, 1,038 g/m².
How to use the vegetable yield calculator
- Choose the basis that matches your yield table - per plant for transplanted crops, per 100 ft for direct-seeded rows. prefill →
- Enter the stand (plants or row length) and the published or measured yield. prefill →
- Set the marketable share: weigh what you actually keep after sorting out culls.
- Add the growing area to get yield per square metre, the number that lets you compare beds.
- Compare g/m² between seasons or varieties - it is the fairest single-number comparison.
Vegetable Yield: the formula & its source
Gross harvest, then the marketable fraction, then unit conversions:
gross = plants × yield per plant
or = (row ft ÷ 100) × lb per 100 ft
marketable = gross × (marketable % ÷ 100)
kg = lb × 0.45359237
g per m² = lb × 453.59 ÷ (area ft² × 0.092903)
The density line is what lets a 400 ft² bed be compared directly with a market garden bed measured in metres.
| Symbol | Meaning | Unit | Typical range |
|---|---|---|---|
Yₚ | harvest expected per plant | lb | 0.1–20 lb by crop |
Y₁₀₀ | harvest per 100 ft of row | lb | 20–600 lb by crop |
m | marketable share of the gross | % | 60–95% after culls |
A | ground the harvest came from | ft² | 20–10,000 ft² |
0.4536 | pound to kilogram conversion | kg/lb | exact factor, not rounded |
Calculate the exact packet counts and seed numbers needed for target harvests using our vegetable seed requirement calculator.
Vegetable Yield: worked example
Worked example - 20 plants at 5 lb each, 85% marketable, 400 ft² bed. Gross = 20 × 5 = 100 lb. Marketable = 100 × 0.85 = 85 lb = 38.6 kg (38,555 g). The bed is 400 ft² = 37.16 m², so yield density = 38,555 ÷ 37.16 = 1,038 g/m² - about a kilogram of marketable produce from every square metre.
Example B: 60 ft of row, 80% marketable, 240 ft²
On the row basis, 60 ft at 100 lb per 100 ft gives a gross 60.0 lb. At 80% marketable that is 48.0 lb, which converts to 21.8 kg (21,772 g). The 240 ft² area is 22.30 m², so yield density comes out at 976 g/m². Read that against the 1,038 g/m² from the per-plant example: different crops and layouts, one number that says which ground earned more.
Two ways of writing the same table
Yield tables arrive in whichever units the author found convenient. Transplanted crops like tomatoes and brassicas are usually written per plant, because that is how they are set out. Direct-seeded crops are written per hundred feet of row, because nobody counts individual carrot plants. The basis switch selects which arithmetic runs, and both paths land in the same pounds.
One correction is common enough to mention twice: many extension tables print per ten feet of row, not per hundred. Six pounds of snap beans per ten feet is sixty per hundred, so multiply by ten before entering it. Getting that factor wrong by an order of magnitude is the fastest way to produce a number that looks reasonable and is wildly off.
Gross flatters, marketable pays
Gross harvest is everything the plants produced. Marketable harvest is what survives pests, splits, disease and the compost pile, and the gap between them is where next season's decisions live. At eighty-five percent the example loses fifteen pounds from every hundred, and most growers discover the real figure is lower than they assumed once the harvest is actually weighed rather than remembered.
The share only means something if the weighing basis stays fixed. Cleaned and trimmed produce one week against a field-run basket the next makes the percentage track your habits rather than the crop. Pick one convention at the start of the season, write it down with the numbers, and the trend across harvests stays readable.
Grams per square metre is the honest comparison
Two beds rarely have the same number of plants, the same spacing or the same crops, so pounds per plant quietly rewards sparse planting. Dividing the marketable weight by the ground it came from removes all three variables at once. The four-hundred-square-foot example converts to 37.16 m², and its 38.6 kg of produce lands at 1,038 grams per square metre.
That single line compares a lettuce patch against a tomato row, last season against this one, and a raised bed against a row garden, because it prices the ground itself. It is also the unit most market-garden records use, so numbers borrowed from books in metric need no conversion before they join your own column.
What the arithmetic will not tell you
This calculator converts a figure you supply; it does not model weather, cultivar or management. A per-plant average also hides the spread within a row, where the first and last plants rarely perform like the middle ones, so a changing average can reflect plant position as much as season quality. Treat the outputs as bookkeeping with a density line, not as a forecast.
The area input is optional because a gross and marketable weight are still useful without it, but adding the ground turns the result into the comparable number. Measure the area the harvest actually came from, including the paths you counted out of it, and the density line stays honest between beds.
Choosing between the two bases
Match the basis to how the crop was set out. Transplants go in one at a time, so per-plant tables fit them and the count comes straight from the planting plan. Direct-seeded crops never get counted individually, so per-hundred-feet tables fit those, and the row length is measured off the bed with a tape rather than estimated. Mixing the two conventions in one season is how a garden record becomes unreadable the following winter.
When a table gives only one basis, the other can be reached through the spacing: plants per hundred feet divided into the row yield gives yield per plant, and multiplying back restores it. Do that conversion on paper once and enter the figure in the basis the calculator expects, because guessing between the two produces numbers that look consistent all season and are wrong by the ratio of the spacings.
Recording the season, not just the number
A single harvest figure settles nothing; the value appears when several of them sit in a column. Write down the date, variety, plant count or row length, gross weight, culls and the area, and the marketable share and density lines can be recomputed later without reweighing anything. Over three seasons the density column starts answering the questions that matter: whether a variety earned its space, whether the earlier planting outperformed the later one, and whether a bed is improving or wearing out.
Keep the culls rather than discarding them from the record. A widening gap between gross and marketable points at pest pressure or watering swings long before the total yield moves, and that gap is often the first signal a season gives. The pounds still matter for the kitchen, but the trend lines are what change next year's plan.
What your vegetable yield result means
Gross yield flatters; marketable yield pays. The gap between the two - what rotted, split or was eaten - is where next season's decisions live, and it is usually larger than growers expect once the harvest is actually weighed.
Grams per square metre turns a home harvest into a comparable number: two beds with totally different crops, spacings and row lengths can be ranked honestly on one line.
How to read the output:| Result range | What it means | What to do next |
|---|---|---|
| 100.0 lb | gross from 20 plants at 5 lb | before sorting, before culls |
| 85.0 lb | marketable at 85% | the figure that gets eaten or sold |
| 38.6 kg | the same 85 lb in kilograms | for records and recipes written in metric |
| 1,038 g/m² | density over 400 ft² | compare this line across beds and seasons |
| 60 lb | row basis: 60 ft at 100 lb per 100 ft | per-10 ft tables must be multiplied by 10 |
Support high harvest yields by calculating soil organic matter amendments with our vegetable bed compost calculator.
Common mistakes with the vegetable yield
- Comparing beds by pounds per plant: Plants per bed differ, so pounds per plant flatters a sparse planting; grams per square metre prices the ground itself and ranks the two beds on equal terms.
- Mixing field-run and cleaned weights: Weigh consistently: a marketable share computed from trimmed produce one week and a dirty harvest the next tracks your habits rather than the crop's performance.
- Forgetting per-ten-foot tables: Extension yield tables often print per 10 ft of row, and multiplying by ten is the entire conversion to the per-100-ft basis this calculator expects from you.
- Reading the average as every plant: A 5 lb average hides that the ends of a row rarely perform like the middle, so spot-check individual plants before concluding the season or variety improved or declined.
Limits of the vegetable yield calculator
These are arithmetic conversions of a yield figure you supply - they do not model weather, cultivar or management, and a per-plant average hides the fact that the first and last plants in a row rarely perform alike.
Weigh produce on a consistent basis (cleaned and trimmed versus field-run) or the marketable share will drift between harvests for reasons that have nothing to do with the crop.
Agronomy note from Dr. Dinesh A. Nagegowda, PhD: Projecting home vegetable yields requires using realistic linear row averages from university extension trials. Yield estimates assume full sun (6+ hours daily), weed competition control, and consistent supplemental irrigation; light shade or uneven watering can reduce realized harvest weights by 30% to 50% below theoretical model maximums.
Sources
- Johnny's Select Seeds, yield estimates in their direct-seeding guidelines (used for: per-row and per-acre yield estimates behind the gross-harvest line)
- Virginia Tech Extension 426-335, home vegetable gardening (used for: production expectations per plant and per row when comparing garden layouts)
- Oregon State Extension EC 871, Vegetable Gardening in Oregon (used for: harvest timing and typical per-plant returns behind the marketable-share judgement)
Cite This Calculator
For laboratory course reports, academic papers, or institutional protocols (APA format):
Vegetable Yield: frequently asked questions
How do I convert pounds per plant to kilograms?
Multiply by 0.45359: 5 lb per plant × 20 plants = 100 lb = 45.4 kg gross.
What is a good yield per square metre for vegetables?
It varies widely - leafy crops and roots often land around 0.5-1.5 kg/m² of marketable weight, while tomatoes can exceed 5 kg/m² in a protected bed.
How do I convert yield per 10 ft of row to per 100 ft?
Multiply by 10: Purdue's 6 lb of snap beans per 10 ft becomes 60 lb per 100 ft.
What counts as marketable yield?
Whatever you would actually eat or sell after culls - split, damaged, diseased or misshapen produce is excluded from the marketable figure.
Found a number that does not match its source? Report a mistake. Corrections are published in place and the page date is updated.
Found a number on this page that doesn’t match its source? Email the correction →.
Dr. Dinesh A. Nagegowda, PhD: Plant & Molecular Biology Editor
Dinesh is a plant molecular biologist and Chief Scientist at CSIR-CIMAP whose research runs through functional genomics, transcriptomics, metabolomics, and biosynthetic pathways in plants. He writes and…