toolbox
Home / Farming, Animals & Pets / Greenhouse Heating Feed Conversion Calculator

Greenhouse Heating Feed Conversion Calculator

The Greenhouse Heating Feed Conversion Calculator expresses greenhouse heating energy relative to marketable crop output. Because the source title combines greenhouse heating with “feed conversion,” this implementation treats heating energy as a production input and reports kilowatt-hours of heating energy per pound of marketable harvest, along with the inverse pounds produced per 1,000 kWh.

The ratio can help compare heating intensity between crop cycles, compartments, or climate-control scenarios when the accounting boundary is consistent. It is not a biological animal feed-conversion ratio. Heating demand can be affected by outdoor temperature, envelope heat loss, infiltration, set points, thermal screens, boiler or heat-pump efficiency, supplemental lighting, and crop timing, while harvested weight can vary with crop and moisture content. Use like-for-like comparisons whenever the metric is used for benchmarking.

Heating conversion inputs

kWh
lb
%
%
Result
—
kWh of heating per marketable pound
Energy assigned to heating—
Marketable harvest—
Marketable lb per 1,000 kWh—

1. Enter energy use
Provide the measured energy consumption for the production period represented by the harvest.

2. Enter harvested crop weight
Use total harvested crop mass for the same greenhouse area and period.

3. Set the marketable share
Enter the percentage of harvest counted as marketable output.

4. Set the heating energy share
If the energy total includes non-heating loads, enter the percentage you want assigned to heating; use 100% for heating-only metering.

5. Review input-to-output conversion
The main result shows heating kWh per marketable pound, while the inverse metric shows marketable pounds per 1,000 kWh.

Assigned heating energy = Total energy × Heating share Marketable harvest = Total harvest × Marketable share Heating conversion ratio = Assigned heating energy ÷ Marketable harvest Marketable output per 1,000 kWh = Marketable harvest ÷ Assigned heating energy × 1,000

This page interprets “feed conversion” as a production-input conversion ratio for the greenhouse-heating context. It does not represent livestock feed conversion or calculate heat demand from greenhouse physics.

What the result means

The result indicates how many kilowatt-hours of assigned heating energy correspond to one pound of marketable harvested crop. Lower kWh per pound means less heating energy was assigned per unit of marketable output, for comparable systems.

Comparisons should use the same crop, harvest moisture basis, greenhouse area, production period, energy boundary, and treatment of shared electrical or thermal loads.

Given: A greenhouse production period uses 18,500 kWh, produces 7,200 lb of harvest, 94% is marketable, and all measured energy is assigned to heating.

Calculation: Assigned heating energy = 18,500 × 1.00 = 18,500 kWh. Marketable harvest = 7,200 × 0.94 = 6,768 lb. Heating conversion ratio = 18,500 ÷ 6,768 = 2.73 kWh/lb. Marketable output per 1,000 kWh = 6,768 ÷ 18,500 × 1,000 = 365.84 lb.

Result: 2.73 kWh of heating energy per marketable pound.

Interpretation: On this accounting basis, each marketable pound is associated with about 2.73 kWh of heating energy.

Is this a standard livestock feed conversion ratio?

No. Here the source title is implemented as an energy-input-to-crop-output ratio for greenhouse heating, not as animal feed consumed per unit of weight gain.

What if my meter includes fans, pumps, and lights?

Use the heating-share field to assign only the portion you intend to count as heating. If you cannot separate the loads, label the comparison as a broader facility-energy ratio instead.

Why use marketable harvest rather than total biomass?

Marketable output can align the ratio with commercial production performance. Use 100% if total harvested mass is the desired basis.

Can two greenhouses be compared directly?

Only with care. Crop type, season, set point, greenhouse envelope, outside climate, production period, and energy-metering boundaries should be comparable.

How is this different from an energy cost estimator?

This calculator compares energy input with crop output. An energy cost estimator multiplies energy use by an energy price to estimate operating expense.