Enter your vegetable crop, number of plants, and garden area to estimate your expected harvest yield. The Vegetable Yield Calculator returns your projected total yield in kg, yield per plant, and space efficiency — helping you plan how much to grow for your household.
Estimated Total Yield
--
Yield per Plant
--
Yield per m²
--
Recommended Plants for Area
--
Estimated Weeks of Supply
--
A vegetable yield calculator estimates how much produce you can expect to harvest based on the type of crop you grow, how many plants you have, and the size of your garden area. It uses average yield-per-plant data combined with growing conditions to give you a realistic harvest forecast.
Enter your chosen crop, the number of plants you intend to grow, and the total area available. The calculator will tell you your expected total yield and also how many plants are recommended for that area based on standard spacing. If you have a target yield in mind, adjust the number of plants until the output matches your goal.
A general guideline is to grow 3–5 broccoli plants per person for a steady supply throughout the season. Each broccoli plant typically yields around 0.5–1 kg, so a household of four would need roughly 12–20 plants to have a meaningful supply.
A typical home vegetable garden ranges from 10 m² to 50 m² (roughly 100–500 sq ft). For a family of four looking to supplement grocery shopping, around 20–30 m² is a practical starting point. Larger plots of 100 m² or more are needed to approach self-sufficiency for a single person.
The most common raised bed size is 1.2 m × 2.4 m (approximately 4 ft × 8 ft), giving about 2.9 m² of growing space. This width allows you to reach the centre from either side without stepping on the soil, which helps maintain good soil structure and plant health.
Growing conditions — including soil quality, sunlight, water supply, and pest management — can dramatically affect your harvest. Optimal conditions may produce yields 30–50% above average, while poor conditions (shaded beds, compacted soil, irregular watering) can reduce yield by a similar margin. This calculator applies a conditions multiplier to your estimate.
According to nutritional guidelines, the average person needs roughly 160–200 kg of vegetables per year (about 500 g per day). This varies by diet, but it gives a useful benchmark when planning how much garden space and how many plants you need for full or partial self-sufficiency.
High-yielding crops per square metre include zucchini (up to 10 kg/m²), tomatoes (5–8 kg/m²), lettuce and spinach (3–5 kg/m²), and cucumbers (4–6 kg/m²). Root vegetables like beets and carrots also perform well in compact spaces. Heavy feeders like broccoli and pumpkins typically require more space per kg of produce.