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Vertical Farm Feed Conversion Calculator

This calculator expresses a vertical farm's tracked production-input mass relative to marketable harvest mass. Although “feed conversion” is more common in livestock production, the same ratio format can be used as a simple material-efficiency indicator when a farm deliberately defines the input being tracked—for example, dry nutrient salts or another standardized consumable mass.

The result should only be compared across periods or facilities when the input boundary is identical. It does not measure energy, water, labor, or total resource efficiency, and it should not mix unlike materials into one mass without a clear accounting method.

Inputs

kg
kg
Result
—
kg/kg
Marketable output—
Output per kg input—

1. Define the tracked input
Decide which single production input mass the ratio will represent and use that same definition every time.

2. Enter input mass
Enter the total mass of the tracked input for the batch or period in kilograms.

3. Enter marketable output
Enter marketable harvest mass from the same batch or period.

4. Review the ratio
The result reports kilograms of tracked input used per kilogram of marketable harvest.

5. Compare consistently
Only compare results when crop, accounting boundary, and measurement period are sufficiently similar.

Conversion ratio = Tracked input mass ÷ Marketable harvest mass

Where:

  • Production input mass: entered in kg
  • Marketable harvest mass: entered in kg

Assumptions: inputs describe the same system, batch, or planning period, and units are used exactly as labeled. The model is intentionally simple and does not add unentered losses, fees, or biological effects.

What the result means

A lower ratio means less of the specifically tracked input mass was used per kilogram of marketable harvest.

Define the tracked input consistently before comparing this ratio across crops, batches, or facilities.

Given:

  • Tracked production input = 640 kg
  • Marketable harvest = 2,560 kg

Calculation:
640 ÷ 2,560 = 0.25 kg/kg

Result:
Input-to-output conversion ratio = 0.25 kg/kg

Interpretation:
The batch used 0.25 kg of the defined input for each kilogram of marketable harvest.

What input should I use in a vertical-farm conversion ratio?

Use one clearly defined mass-based input that you intentionally want to track. The metric is only meaningful when that boundary stays consistent.

Is a lower ratio always better?

A lower ratio means less of the tracked input per kilogram of marketable harvest, but it does not show quality, crop time, energy use, water use, or profit.

Can I combine several different inputs into one mass?

Only if your accounting method explicitly defines that combined mass and you use it consistently. Adding unlike materials can make comparisons difficult to interpret.

What happens if harvest output is zero?

A conversion ratio cannot be calculated with zero output because it would require division by zero. Enter a positive marketable harvest mass.

How is this different from yield per square foot?

Yield measures output relative to growing area. This conversion ratio measures output relative to the specifically tracked input mass, so the two indicators answer different questions.