Free harvest calculator

What could your harvest be worth?

Estimate yield, money saved, food portions and a cautious climate comparison—then download a graphic to share your result.

✓ Editable prices and costs
✓ Honest yield ranges
✓ Downloadable results

Your crop and setup

Estimate the harvest.

Start with a cautious planning range, then adjust the price and costs to match what you actually buy.

Crop

What are you measuring?

Number of plantsGrowing area

Number of plantsExpected growing resultComparable supermarket price (£/kg)Editable rounded default; use the price and quality you would actually buy.Your seeds, plants and growing costs (£)Include crop-specific compost, feed, seed and replacement supports.Carbon scenario

Yield, price, nutrition and carbon figures are estimates—not promises or carbon-accounting claims.

Your harvest value will appear here.

See a realistic yield range, retail comparison, food portions, break-even point and cautious climate estimate.

Crop calculators

Start with what you grow.

TomatoesCalculate →Early potatoesCalculate →CarrotsCalculate →CourgettesCalculate →French beansCalculate →PeasCalculate →LettuceCalculate →RocketCalculate →SpinachCalculate →KaleCalculate →GarlicCalculate →Salad radishesCalculate →BeetrootCalculate →OnionsCalculate →CucumbersCalculate →

What the money figure means

A replacement-value estimate, not income.

The tool values the edible harvest at the retail price you enter, then subtracts the crop costs you enter. It excludes your time and any shared or permanent equipment unless you add those costs yourself.

What the carbon figure means

Homegrown is not automatically lower-carbon.

The potential reduction is deliberately limited by the selected growing scenario. New beds, short-lived structures, heated greenhouses and purchased materials can outweigh the commercial footprint being displaced.

Urban agriculture comparison study ↗

Nutrition basis: CoFID and an 80g NHS adult fruit-and-vegetable portion.UK food composition data ↗NHS portion guidance ↗