How to Use the Greenhouse ROI and Project Budget Calculators Correctly

SeedMatchGroup publishes three calculators that cover different parts of the same commercial greenhouse decision: the Greenhouse ROI Calculator models one steady production year to see whether a crop and technology combination can cover its own operating cost and earn back its capital; the Project Budget Calculator builds the full cash a project needs, including working capital, and splits it into equity, debt and the funding gap; and the CAPEX Calculator gives a directional capital-cost range by greenhouse type, irrigation type, region and automation tier. None of the three recommends a supplier, sets a price, or promises a return. Used in sequence and with your own numbers, they turn a rough idea into a brief a supplier can actually price.

What each calculator is for

The three tools answer different questions, and mixing them up is the most common way buyers misread the output. The ROI calculator asks: at this yield, price and cost, does the project generate enough EBITDA to be worth pursuing, and roughly how long would payback take? The project budget calculator asks: how much total cash does this project need from first spend to the point it reaches stable revenue, and where will that cash come from? The CAPEX calculator asks: before I have supplier quotations, what is a directional capital-cost range for this type and scale of structure, so I can sanity-check a number before I commit to deeper planning? A buyer who only runs the ROI calculator and skips the budget calculator typically underestimates how much cash the project actually needs, because EBITDA says nothing about working capital, and a buyer who only runs the CAPEX calculator without the ROI calculator has no way to tell whether that capital cost is justified by what the project can actually earn.

Inputs in the Greenhouse ROI Calculator

The ROI calculator asks for six inputs, each of which has a direct, visible effect on the result: greenhouse area, crop, greenhouse technology, yield per unit area per year, farmgate price per unit of product, installed CAPEX per unit area, and operating cost per unit area per year. Choosing a crop loads a typical yield and price range as a starting point, and choosing a technology — polytunnel, multi-span polyhouse, Venlo glass or semi-closed — loads a utilisation factor (the share of the covered area actually in production) and a typical operating-cost range for that technology. These loaded ranges exist so a first-time user has somewhere to start; they are not forecasts for your site, your climate, your labour market or your energy cost, and the calculator expects you to replace them.

Why CAPEX and OPEX should be your own numbers, not the defaults

The CAPEX-per-area field in the ROI calculator defaults to the midpoint of the published commercial greenhouse cost benchmark for the chosen technology, and the operating-cost field defaults to the midpoint of a typical range for that technology. Both are explicitly labelled as planning ranges to replace with your own data, not as a quote. The moment you have a real number — a supplier's indicative price per square metre, your own energy tariff, your actual labour cost per worker per month, your fertigation input cost — replace the default with that number. A result built entirely on default CAPEX and default OPEX tells you what the benchmark technology costs in general; it does not tell you what your project costs, and treating the default output as your project's number is the single most common misreading of this tool. The same logic applies to the Project Budget Calculator and the CAPEX Calculator: every dollar figure you enter there — equipment and structures, civil works, installation and commissioning, freight and duties, soft costs, contingency, monthly operating cost, committed equity, indicated debt — should come from your own quotations, your own site survey or your own financial statements wherever you have them, with the calculator's defaults used only as a placeholder until you do.

How the ROI scenarios are built

The ROI calculator does not show a single number; it shows low, base and high scenarios side by side, because a single-point estimate hides how sensitive the result is to small changes in yield or price. The base scenario runs your inputs exactly as entered. The low scenario reduces yield and farmgate price by 15% each and increases operating cost and CAPEX by 15% each, modelling a year where production underperforms and costs run high. The high scenario increases yield and price by 10% each and reduces operating cost and CAPEX by 10% each, modelling a year where production, market price and cost control all go in the buyer's favour at once. These percentages are fixed sensitivity bands built into the model, not a prediction of how likely each outcome is; a wide gap between the low and high scenario in your own result usually means the underlying assumptions are not yet firm enough to commit capital against, and is a signal to tighten the yield and price inputs with real agronomic and market data before relying on the output.

The formulas behind the result

Every figure the ROI calculator shows is built from the same five steps, and knowing them lets you check the output by hand or stress-test it with your own spreadsheet. Production (quantity per year) equals area multiplied by yield per unit area per year multiplied by utilisation, the share of the area actually in production for the chosen technology. Revenue equals production multiplied by farmgate price. EBITDA equals revenue minus operating cost, where operating cost equals your entered operating cost per unit area multiplied by area. Return on CAPEX equals EBITDA divided by CAPEX, where CAPEX equals your entered CAPEX per unit area multiplied by area. Simple payback in years equals CAPEX divided by EBITDA, and the calculator only shows a payback figure when EBITDA is positive — a negative or zero EBITDA year does not pay back at all, no matter how low the CAPEX is.

What the model deliberately leaves out

The ROI calculator models exactly one steady-state production year with no ramp-up period, no inflation, no depreciation, no tax, no financing cost and no discounting, which is why the result it produces is EBITDA for a single year, not net profit and not a discounted return such as IRR or NPV. A real greenhouse rarely reaches full yield in its first year; crop establishment, operator learning curve and system commissioning typically mean the first one or two years underperform the steady-state figure the calculator shows. Likewise, the Project Budget Calculator's working-capital line only covers the months you enter until first stable revenue — if your ramp-up actually takes longer than that, the funding gap the calculator shows will understate what you actually need. None of this is a flaw to work around; it is the deliberate scope of a planning tool. A bankable feasibility study, by contrast, uses discounted multi-year cash flow with a ramp-up schedule, financing cost and tax, which is a different and more detailed exercise than either calculator attempts.

No guaranteed return, no guaranteed payback

Every result from the ROI calculator is explicitly labelled a planning scenario, not an investment appraisal, financial advice or a supplier quote, and no return or payback period is guaranteed by SeedMatchGroup or implied by the tool. The low, base and high scenarios describe how the result moves under the model's built-in sensitivity bands, not a probability distribution of what will actually happen on your site. Real returns depend on the crop protocol you run, the local climate, your energy strategy, labour availability and cost, financing terms and whether you secure the offtake you planned for — factors the calculator cannot see and does not attempt to model. Treat the output as a reason to investigate further or to stop, not as a number to put in front of a lender or investor on its own.

Using the Project Budget Calculator and the CAPEX Calculator alongside it

Once the ROI scenario looks worth pursuing, the Project Budget Calculator turns the capital side into a fundable budget. It adds equipment and structures, civil works and site preparation, installation and commissioning, a freight-and-duties percentage on equipment, a soft-costs percentage covering design, permits, supervision, legal and insurance, and a contingency percentage, to build total CAPEX; it then adds first-season working capital — monthly operating cost multiplied by the number of months until stable revenue — to produce the total project budget; and it compares that total against committed equity and indicated debt to show the funding gap, the amount still needing a financing route. The calculator notes that land acquisition and financing interest during construction are excluded, so add those separately if they apply to your project. The CAPEX Calculator is useful earlier, before you have firm quotations: it gives a directional capital-cost range by greenhouse type, irrigation type, region and automation tier, with a balance-of-project allowance for design, installation, spares, freight and contingency layered on top, so you can sanity-check a very early concept before investing time in the more detailed ROI and budget work.

Common mistakes

Leaving the CAPEX and operating-cost fields at their loaded defaults and presenting the result as your project's number. Reading only the base scenario and ignoring the spread between low and high, which is where the real planning information sits. Treating a positive base-case EBITDA as a guaranteed return rather than a single steady year under stated assumptions. Forgetting that payback here is simple and undiscounted, and quoting it to a lender as if it were an IRR or a discounted payback period. Running the ROI calculator without ever running the Project Budget Calculator, and then being surprised that the project needs more cash than the CAPEX figure alone suggested. Underestimating the working-capital months needed to reach stable revenue, which understates the funding gap. Using the CAPEX Calculator's directional range as a final number instead of a reason to request supplier quotations.

Turning calculator output into an RFQ

The outputs of these calculators are a starting brief, not a finished one. Each calculator has a built-in option to send its inputs and results directly into an RFQ, carrying forward area, crop, technology, yield, price, operating cost, CAPEX, EBITDA scenarios and the budget build-up so you do not have to retype them. Before sending, it helps to tighten the inputs you are least sure of — replace a default CAPEX or OPEX figure with a real supplier indication or utility quote wherever you can get one, and note in the brief which figures are still estimates versus which are confirmed. A sourcing specialist then reviews the submission by hand for completeness before SeedMatchGroup carries out manual, discretionary outreach to qualified suppliers; buyer details are not shared openly, and the number of offers, the prices in them and how quickly suppliers respond are not guaranteed. Commercial projects are generally considered from a minimum of USD 250,000; full detail on how outreach and allocation work is set out in the terms of use.

How SeedMatchGroup helps

SeedMatchGroup's role stays the same at every stage of this planning process: human-led. A sourcing specialist reviews every brief by hand, and proprietary technology supports that review and the matching process without replacing a specialist's judgment. Outreach to suppliers is manual and discretionary rather than an automated broadcast, and buyer details are never shared openly — all communication runs through SeedMatchGroup. Nothing about the number of offers received, the prices they contain or how quickly suppliers respond is guaranteed, and commercial projects are generally considered from a minimum of USD 250,000. Once your ROI scenario and budget build-up are ready, you can carry them straight into a structured request through the RFQ builder.

Sources and further reading

For general institutional context on greenhouse investment appraisal and project feasibility practice, see the FAO and the World Bank's project appraisal guidance. These public resources do not endorse SeedMatchGroup.