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Calculator · Garden
Vegetable Yield Calculator
The vegetable yield calculator lets you estimate in seconds how many kilograms of vegetables you can harvest from your garden or allotment. Simply enter the growing area in square metres, the base yield for your chosen vegetable (kg/m²) and the level of care — the calculator instantly shows the estimated total yield and per-10 m² and per-100 m² benchmarks. Harvest planning is essential for both hobby gardeners and small-scale vegetable growers. Knowing the expected yield helps you plan storage space, the number of jars for preserves and even the sale of surplus produce. Keep in mind that actual harvests depend on weather conditions, soil quality, plant variety and the timeliness of care tasks — the calculator provides indicative values based on agronomic data.
How we calculate vegetable yield
Estimated yield (kg) = area (m²) × base yield (kg/m²) × care factor. Care factor: 0.5 — poor (neglect, drought), 1.0 — standard (regular watering and fertilising), 1.3 — intensive (drip irrigation, compost, plant protection). Results are rounded to 2 decimal places.
Example: tomatoes, 20 m², standard care
Tomatoes have a base yield of about 5 kg/m². On 20 m² with standard care (factor 1.0): 20 × 5 × 1.0 = 100 kg. With intensive care (factor 1.3): 20 × 5 × 1.3 = 130 kg. That is enough for dozens of jars of preserves or several months of supply for a family of four.
Frequently asked questions
How much yield can I expect from 1 m² of vegetables?
It depends on the vegetable. Tomatoes yield about 5–8 kg/m², cucumbers 4–6 kg/m², lettuce 2–3 kg/m², carrots 3–5 kg/m² and courgettes 4–7 kg/m². The calculator lets you enter the exact base yield for your crop.
What is the care factor and how does it affect yield?
The care factor accounts for the intensity of cultivation. A factor of 0.5 means poor care (irregular watering, no fertilising), 1.0 is standard care and 1.3 is intensive care (drip irrigation, organic compost, regular plant protection). Good care can increase yield by 30% or more.
How do I measure my growing area accurately?
Measure the length and width of your plot in metres and multiply them: area = length × width. For irregular shapes, divide the plot into rectangles, calculate each area separately and add them together.
Does soil quality affect the yield estimate?
Yes. The base yield values in the calculator assume good, fertile soil. If your soil is poor or compacted, use a lower care factor (e.g. 0.6–0.8). Adding compost and enriching the soil can bring it closer to the standard level.
Can I use this calculator for greenhouse growing?
Yes. Greenhouse growing typically gives higher yields due to a longer season and better temperature control. Increase the care factor to 1.2–1.3 and use the higher end of the base yield range for your vegetable.
How does watering frequency affect vegetable yield?
Regular, consistent watering is one of the most important factors for high yields. Under-watering by as little as 30% can halve yields for water-hungry crops like tomatoes, cucumbers and peppers. Drip irrigation is considered optimal.
How do I plan storage based on the estimated yield?
A typical 1-litre jar of tomato preserve requires about 1.2–1.5 kg of fresh tomatoes. For 100 kg of tomatoes you can produce 65–80 jars. Use the total yield figure from the calculator to plan your pantry or cold storage capacity.
Why do actual yields sometimes differ from the calculator?
The calculator uses average agronomic data. Actual results depend on the specific variety, microclimate, pest pressure, disease, irrigation quality and fertilisation. Think of the result as a planning estimate, not a guarantee.
Which vegetables give the highest yield per square metre?
Among common garden vegetables, tomatoes (5–8 kg/m²), courgettes (4–7 kg/m²) and cucumbers (4–6 kg/m²) are among the most productive per square metre. Leafy greens like spinach give lower weight yields but multiple harvests per season.
How many harvests per year should I plan for?
The calculator estimates yield for one growing cycle. Many vegetables allow 2–3 harvests per year in Polish climate conditions — for example lettuce (3–4 cycles), radishes (4–5 cycles) and spinach (2–3 cycles). Multiply the result by the number of planned cycles for an annual estimate.
Indicative result
Results are estimates only. Actual yields depend on soil and climate conditions, plant variety and cultivation intensity. The calculator does not replace the advice of an agronomist.
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