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Calcimator

Development Pro Forma Calculator

Create a development pro forma with revenue, costs, profit, and ROI projections.

About this calculator

A development pro forma is the standard tool land developers use to test whether a subdivision project pencils out before committing capital, and this calculator builds one from the core revenue and cost drivers. On the revenue side, Gross Revenue is Total Lots multiplied by Avg Sale Price per Lot, and Sales Commission (a percentage of gross revenue) is subtracted to get Net Revenue. On the cost side, Hard Costs combine Land Acquisition Cost with Site Development per Lot multiplied by Total Lots -- the physical costs of buying land and installing grading, utilities, and roads. Soft Costs, Financing Costs, and Contingency are each calculated as a percentage of Hard Costs, reflecting how engineering, permitting, legal, design, interest, loan fees, and reserve for overruns typically scale with the size of the physical build rather than with the eventual sale price.

Total Profit is Net Revenue minus the full cost stack (Hard Costs, Soft Costs, Financing Costs, and Contingency), and Profit Margin expresses that profit as a percentage of Gross Revenue -- a typical target for residential subdivision development is 15-25% of gross revenue, though this varies by market, risk profile, and project type. Return on Investment (ROI) instead expresses profit as a percentage of Total Project Cost, answering a different question: not how much of each sale dollar is profit, but how much profit was generated per dollar actually invested. Because both raising Avg Sale Price per Lot and raising Land Acquisition Cost move Total Profit in opposite directions -- one increases revenue, the other increases cost -- comparing Profit Margin against ROI side by side helps identify whether a project's economics are being driven more by pricing power or by cost control.

Inputs

$
$
$
% of hard
% of hard
%
% of hard

Results

Total Profit

$1,577,500.00

≈ 4 average U.S. homes

Profit Margin

26.29%

Gross Revenue$6,000,000.00
Total Project Cost$4,422,500.00
Return on Investment35.67%
Total Cost per Lot$88,450.00
Profit per Lot$31,550.00
How to Use This Calculator
  1. Enter Total Lots and Average Sale Price per finished lot from market research.
  2. Set Land Acquisition Cost and Site Development Cost per lot (grading, utilities, roads, landscaping).
  3. Enter Soft Costs % (engineering, permits, design) and Financing Costs % of hard costs.
  4. Set Sales Commission % and Contingency % for unexpected cost overruns.
  5. Review Total Profit and Profit Margin — typical target is 15–25% of gross revenue for residential subdivision.
  6. Check per-lot economics (revenue, cost, profit) to identify which lot types or phases are most profitable.

How the result changes with Avg Sale Price per Lot

Avg Sale Price per LotTotal ProfitProfit Margin
$60,000.00-$1,242,500.00-41.42%
$90,000.00$167,500.003.72%
$180,000.00$4,397,500.0048.86%
$300,000.00$10,037,500.0066.92%

What each input means

Total Lots
Total number of lots or units to develop.
Avg Sale Price per Lot
Average sale price per finished lot.
Land Acquisition Cost
Total land purchase cost.
Site Development per Lot
Per-lot cost for grading, utilities, roads, and landscaping.
Soft Costs
Engineering, permitting, legal, and design as % of hard costs.
Financing Costs
Interest and loan fees as % of hard costs.
Sales Commission
Sales commission as percentage of gross revenue.
Contingency
Contingency reserve as % of hard costs.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    8 parameters
    Total Lots = 50, Avg Sale Price per Lot = 120000, Land Acquisition Cost = 1500000, Site Development per Lot = 35000, Soft Costs = 12, Financing Costs = 8, Sales Commission = 6, Contingency = 5 = 8 input(s) provided
  2. Calculate Total Profit
    Total Profit
    1577500 = $1,577,500
  3. Calculate Profit Margin
    Profit Margin
    26.29 = 26.29%
  4. Calculate Gross Revenue
    Gross Revenue
    6000000 = $6,000,000
  5. Calculate Total Project Cost
    Total Project Cost
    4422500 = $4,422,500

Engine last updated . Checked against 1 independently-derived test — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.

Frequently Asked Questions

Does raising Land Acquisition Cost always lower Total Profit?

Yes -- Land Acquisition Cost feeds directly into Hard Costs, and Hard Costs is subtracted (along with Soft Costs, Financing Costs, and Contingency) from Net Revenue to get Total Profit. Since Soft Costs, Financing Costs, and Contingency are all calculated as percentages of Hard Costs, a higher Land Acquisition Cost also raises those three downstream cost categories, compounding its effect on profit beyond just the direct dollar-for-dollar increase.

Why are Soft Costs, Financing Costs, and Contingency percentages of Hard Costs instead of Gross Revenue?

Engineering, permitting, legal, design, financing interest, and contingency reserves scale primarily with the physical scope and cost of construction -- a bigger, more expensive build requires more engineering and financing regardless of what the lots eventually sell for. Basing these percentages on Hard Costs rather than Gross Revenue keeps the cost side of the pro forma internally consistent even if market sale prices shift independently of construction costs.

What's the difference between Profit Margin and Return on Investment (ROI) here?

Profit Margin divides Total Profit by Gross Revenue, showing what share of each sale dollar is profit, while ROI divides Total Profit by Total Project Cost, showing how much profit was generated per dollar actually spent building and carrying the project. These can diverge meaningfully: a project with thin margins but low capital cost can still post a strong ROI, and vice versa.

Does Avg Sale Price per Lot affect Total Project Cost?

Indirectly, yes -- Total Project Cost includes Sales Commission, which is calculated as a percentage of Gross Revenue (Total Lots times Avg Sale Price per Lot), so a higher sale price raises the commission dollar amount even though the rest of Total Project Cost (Land Acquisition Cost, Site Development, Soft Costs, Financing Costs, and Contingency) depends only on Hard Costs and never on sale price at all. This is a smaller effect than the direct revenue impact, since only the commission percentage of the sale price increase flows through to cost.

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