Formula Used
Usable Area = Total Garden Area × (1 − Path Percentage) Plant Capacity = Crop Area ÷ Space Required per Plant × Planting Method Factor Expected Mature Plants = Minimum of Capacity and (Planted Quantity × Germination × Survival) Gross Yield = Mature Plants × Yield per Plant per Harvest × Harvest Count Condition-Adjusted Yield = Gross Yield × Combined Growing Condition Factor Net Yield = Condition-Adjusted Yield × Product of All Remaining Loss Factors Edible Yield = Net Yield × Edible Portion Percentage Household Coverage = Edible Yield ÷ Household Requirement × 100 Estimated Profit = Crop Value − Crop-Specific Costs − Shared Costs
The calculator applies losses multiplicatively instead of adding every percentage. This prevents combined losses from exceeding the original harvest. Real yields still vary by variety, climate, management, and local conditions.
How to Use the Calculator
- Choose a garden shape and enter its measurements.
- Select a planting method and estimate unusable path area.
- Add every crop, then review spacing and yield defaults.
- Enter germination, survival, harvest count, and edible percentage.
- Rate growing conditions and add realistic loss allowances.
- Set household consumption, preservation targets, prices, and costs.
- Submit the form and review crop-level and overall results.
- Download the table, print it, or save a preset.
Example Crop Data
| Crop | Plant spacing | Row spacing | Yield per plant | Days to maturity | Typical use |
|---|---|---|---|---|---|
| Tomato | 24 inches | 36 inches | 3.6 kg | 75 | Fresh eating, sauces, freezing |
| Lettuce | 10 inches | 12 inches | 0.45 kg | 50 | Fresh salads |
| Carrot | 3 inches | 12 inches | 0.12 kg | 70 | Fresh eating, storage |
| Potato | 12 inches | 30 inches | 1.2 kg | 95 | Fresh eating, storage |
| Bean | 6 inches | 24 inches | 0.55 kg | 58 | Fresh eating, freezing |
| Courgette | 30 inches | 36 inches | 5.5 kg | 55 | Fresh eating, freezing |
These figures are planning defaults rather than guaranteed production values. Replace them with local extension data or your garden records. Variety-specific information improves each estimate considerably.
Accuracy and Yield Improvement Tips
- Use realistic germination and transplant survival records.
- Measure planted areas after paths and access spaces.
- Update yield rates using your previous harvests.
- Separate fresh consumption from preservation requirements.
- Rotate crop families to reduce persistent pest pressure.
- Track actual harvest weights throughout the season.
- Review estimates after severe weather or disease outbreaks.
Frequently Asked Questions
1. What does garden yield mean?
Garden yield is the amount of produce harvested from a planting area. It may be measured by weight, pieces, bunches, or marketable units. This calculator standardises the main estimate in kilograms.
2. Are the crop defaults guaranteed?
No default can guarantee a real harvest. Soil, climate, variety, pests, and management create meaningful differences. Replace defaults with reliable local records whenever possible.
3. Why are loss percentages multiplied?
Each loss acts on the remaining crop rather than the original crop. Multiplication models that sequence more realistically than simple addition. It also avoids impossible losses above one hundred percent.
4. What happens when allocations exceed 100 percent?
The calculator normalises every allocation into a proportional share. This preserves the relationship between crops without rejecting the calculation. Exact percentages still make the plan easier to understand.
5. Can I calculate multiple raised beds?
Yes, enter one bed's length and width. Then enter the number of identical beds in the count field. Different bed sizes can be combined using direct total area.
6. How is plant capacity estimated?
Capacity uses crop area divided by spacing between plants and rows. A planting-method factor then adjusts the density estimate. Actual layout obstacles can reduce the final capacity.
7. How should succession planting be entered?
Select succession planting and increase the number of harvest cycles. Use the harvest count carefully for repeated sowings or cut-and-come-again crops. Avoid counting one seasonal yield more than once.
8. What is household coverage?
Coverage compares edible yield with the selected household requirement. One hundred percent means the estimate exactly meets that target. Higher values indicate surplus, while lower values indicate shortage.
9. Can the calculator estimate crop value?
Yes, value equals edible yield multiplied by market price per kilogram. Costs are then deducted to estimate profit. Home-grown value may differ from actual selling revenue.
10. How should actual yield be recorded?
Weigh each crop after harvest and enter its total kilograms. The results then compare actual output with the forecast. Regular records improve future assumptions and planning accuracy.
11. Does the tool replace local agricultural advice?
No, it provides planning estimates for gardens and small growing spaces. Local experts can provide variety, disease, irrigation, and climate guidance. Use professional advice for commercial production decisions.