Crop Yield Calculator
Estimate the total harvest from a plant count, using typical yields per plant.
‘How much will I actually get’ is the question behind every seed order, and the honest answer is a range, not a number: variety, weather and care swing yields widely. This calculator applies typical home garden yields per plant and gives you the realistic middle with a low and high band, in pounds and kilograms, plus the bed area those plants occupy at proper spacing.
Work from the plant count you have or plan. To start from bed size instead, the Harvest Yield Estimator counts the plants that fit first.
How this is worked out
Total yield = plants x typical yield per plant for the crop, presented as a band from 30 percent under the typical figure to 35 percent over it. The asymmetry is deliberate: good years outrun the typical figure further than bad years fall short, because most home garden shortfalls are capped by plant count while good care keeps adding fruit. Per-plant figures are home garden values, well below commercial field yields per area, because home spacing is wider and picking is gentler.
Assumptions:
- Yields are fresh weight as harvested, including the parts you trim (a cabbage’s outer leaves count in garden reality).
- Perennials (asparagus, strawberries) are at mature-bed rates, not first year rates.
- Succession and staggered harvests do not change the per-plant total; they change when it arrives.
Worked examples
1. Ten tomato plants. At about 4 lb per plant in an average home season, expect roughly 28 to 54 lb: enough for fresh eating and a canning day, from about 40 sq ft of bed.
2. Four zucchini plants. At about 8 lb per plant (and it can be far more), 22 to 43 lb. The classic lesson: zucchini yield is limited by your neighbours’ willingness to accept zucchini.
3. A hundred carrots. Carrots are counted by the row rather than the plant in most gardens: at about a quarter pound each, 18 to 34 lb from roughly 8 sq ft of dense bed, the best pounds per square foot on this page.
Yields per plant at a glance
| Crop | Typical lb per plant | Spacing |
|---|---|---|
| Tomato | 4.0 | 24 in |
| Pepper (bell) | 1.5 | 18 in |
| Eggplant | 3.0 | 24 in |
| Potato | 5.0 | 12 in |
| Cucumber | 2.0 | 12 in |
| Zucchini | 8.0 | 36 in |
| Winter Squash | 6.0 | 48 in |
| Pumpkin | 10.0 | 60 in |
| Melon | 5.0 | 48 in |
| Watermelon | 8.0 | 60 in |
| Lettuce | 0.4 | 8 in |
| Spinach | 0.3 | 6 in |
The full list of 37 crops is in the calculator itself. Treat every figure as the centre of a wide range: variety choice alone can double or halve some of these.
Common mistakes
- Planning storage or preserving from the high end. Jar counts and freezer space should be planned from the middle of the range; the high end is a pleasant problem, not a plan.
- Comparing to commercial yields. Field figures assume field density, field varieties and machine harvest. Home yields per plant at garden spacing are a different, kinder sport.
- Forgetting harvest loss. Split tomatoes, bolted lettuce and the zucchini that became a club all grew, but none were eaten. A realistic gardener discounts the range by the share their garden usually wastes.
- One variety, one year, one verdict. A crop that yields badly once may have met a bad year. Two seasons is the minimum fair trial for a per-plant figure.
Putting the result to work
Multiply the middle figure by your store price for the crop and the Vegetable ROI Calculator turns it into money saved. Log the actual harvest in the Garden Harvest Value Tracker and next year’s estimate for your garden stops being a table and starts being a record.
How much will my plants produce?
- Pick the crop; its typical yield per plant and spacing are built in.
- Enter the number of plants.
- Read the yield band in pounds and kilograms, and the bed area the plants take.
- Plan eating and preserving from the middle figure.
- Log the real harvest to calibrate next year.
How accurate are these yield estimates?
They are planning ranges, deliberately wide. Within a single garden, variety, season and care can each move a crop’s yield by a third. The middle figure is a fair expectation for a watered, fed home bed; commercial yields per area are not comparable because spacing and harvest methods differ.
Why is the high end further from the middle than the low end?
Because downside is capped and upside is not. A bad year still gives the plants you planted, minus losses; a good year with thorough picking can push fruiting crops well past the typical figure, as anyone who has grown zucchini in a warm summer knows.
Which crop gives the most per square foot?
Dense root and leaf crops usually win on weight per area: carrots and beets at close spacing, and cut-and-come-again chard and kale across a long season. Tomatoes are respectable; sprawling squash is the weakest use of a square foot by weight, whatever its charms.
Do these figures include what I trim off?
They are fresh harvested weight, so a cabbage includes its outer leaves and a corn cob its husk. Edible weight runs 70 to 85 percent of that for most crops. For preserving plans, work from the middle figure and assume about three quarters of it reaches the jar.
How do I get a better estimate for my own garden?
Weigh one season’s harvest per crop (a luggage scale and a notebook by the door) and divide by plants. Your figure, for your soil and habits, replaces the table’s. The Harvest Value Tracker is built to accumulate exactly that record.
Per-plant yields are typical home garden planning figures consistent with US extension and seed trade references, presented as ranges.
