Harvest Yield Estimator
Estimate the harvest from a bed’s size: plants that fit, times typical yield per plant.
The Crop Yield Calculator starts from plants you counted. This estimator starts one step earlier, from the bed itself: give it a crop and a bed size and it works out how many plants fit at proper spacing, then applies typical yields to give the bed’s expected harvest as a range. It is the tool for the planning question: what is this bed worth if I fill it with one crop?
Use it to compare crops for a spare bed: the pounds per square foot line in the result is the fairest comparison a gardener gets. For the money version of the same comparison, take the winner to the Vegetable ROI Calculator.
How this is worked out
Plants that fit = bed area divided by the square of the crop’s spacing, rounded down, which is the same square grid the Plant Spacing Calculator lays out. Yield = plants x typical yield per plant, shown as the same planning band as the Crop Yield Calculator (30 percent under to 35 percent over the typical figure). Pounds per square foot divides the middle estimate by the bed area and is the number to compare crops by.
Assumptions:
- The whole bed is one crop at full spacing. Real beds mix crops and edges, so treat the figure as the crop’s ceiling for that ground.
- Paths inside the bed outline are not deducted; a bed you step into effectively has less planting area.
- Intensive methods (square foot, biointensive) plant denser than the standard spacings used here and can beat these figures, with more feeding and watering to match.
Worked examples
1. Carrots in a 4 x 8 ft bed. At 3 in spacing the bed notionally fits over 500 carrots; at a quarter pound each the middle estimate is about 32 lb. Dense roots are the yield-per-foot champions.
2. Tomatoes in the same bed. At 24 in spacing, 8 plants, about 32 lb in the middle: similar pounds, completely different eating.
3. Winter squash in the same bed. At 48 in spacing, 2 plants and about 12 lb, plus vines over the paths. The estimator is blunt about sprawl, which is its job.
Comparing crops for one spare bed
| Crop in a 4 x 8 bed | Plants | Middle estimate | lb per sq ft |
|---|---|---|---|
| Carrot | 512 | 128.0 lb | 4.0 |
| Tomato | 8 | 32.0 lb | 1.0 |
| Spinach | 128 | 38.4 lb | 1.2 |
| Zucchini | 3 | 24.0 lb | 0.75 |
| Beans (bush) | 288 | 144.0 lb | 4.5 |
| Beet | 288 | 115.2 lb | 3.6 |
Weight is not the only value: herbs yield ounces and save pounds of money. Use this table for staple crops, and the ROI calculator where price per pound does the talking.
Common mistakes
- Comparing crops by per-plant yield. A pumpkin plant out-yields a carrot plant a hundredfold and loses per square foot. Beds are area, so compare per area.
- Trusting the fitted count for sprawling crops. Two squash plants in a bed is a floor plan fiction by July; they will have the paths too. Judge by how the mature plant actually occupies ground.
- Filling every bed with the ‘best’ crop. The best pounds per foot (carrots, beets) are not a diet. Rotation and appetite both outrank the table.
- Forgetting succession doubles some beds. A bed of radishes in April and beans in June yields both crops’ estimates in a year. The estimator prices one filling; your calendar may fit two.
Putting the result to work
Run the two or three crops you are torn between for a spare bed, then check the winner against the rotation: the best yielding crop is still wrong in a bed that grew its family last year. Feed the middle estimate into the Vegetable ROI Calculator to see what the bed earns.
How much will this bed produce?
- Pick the crop you are considering for the bed.
- Enter the bed’s length and width.
- Read plants that fit, the yield band, and pounds per square foot.
- Compare two or three candidate crops for the same bed.
- Check the winner against your rotation before committing the bed.
What is the difference between this and the Crop Yield Calculator?
The starting point. This estimator begins with a bed size and counts the plants that fit at proper spacing; the Crop Yield Calculator begins with a plant count you already have. They use the same per-plant yields, so the two agree when the plant counts match.
Which vegetable gives the highest yield per square foot?
By weight, dense roots and leaves: carrots, beets, chard and kale at close spacing across a long season. By money it is often the opposite end: herbs and salad leaves with high shop prices. The estimator gives the weight answer; the ROI calculator gives the money answer.
Why does the plant count look so high for carrots?
Because at 3 inch spacing a 4 x 8 bed genuinely holds over 500 carrots in a square grid, and market gardeners plant nearly that dense. Home gardeners usually sow in rows with wider gaps for weeding, and get fewer, bigger roots. Both are correct; they are different systems.
Can intensive spacing beat these estimates?
Yes, with inputs to match. Square foot and biointensive spacings plant tighter than the standard figures here and can raise yield per bed by a third or more, paid for in compost, water and attention. The estimator uses standard spacing so its figures stay honest for a typical bed.
Should I plant the whole garden with the best yielding crop?
No. Yield per foot is one criterion among rotation, season length, succession potential, and whether your household will eat 60 lb of any single thing. The estimate informs the choice; it does not make it.
Plant counts use standard spacing in a square grid; per-plant yields are typical home garden planning figures, the same set as the Crop Yield Calculator.
