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●Academy · Tool

Property Potential Calculator

Enter a lot size and a few zoning assumptions to see the buildable area, likely unit count, project cost, finished value, and development margin instantly. It is a back-of-envelope tool to decide whether a property is worth a deeper look.

Aerial view of a single house on a large lot with development potential
Max units
214
Value uplift
+$13.5M

A back-of-envelope read on a real lot — run your own numbers in the live calculator below.

Your assumptions
sf
Total parcel area.
×
Floor area ratio permitted by zoning.
sf
Typical finished unit area.
$ /sf
Hard cost per buildable sf.
%
Design, permits, financing, contingency.
$
What you pay for the lot.
$
Sale price or capitalized value.
Estimated potential
Buildable area
7,500 sf
Likely units
6
Total project cost
$3.23M
Gross finished value
$3.90M
Development margin on cost
20.9%
Healthy margin. On these assumptions the deal pencils with room to absorb risk — worth a deeper, parcel-specific analysis.
Run the real analysis in Snap

This calculator is an educational estimate using simplified assumptions. It does not account for parking, setbacks that reduce yield, financing structure, taxes, or local code nuances. For a real analysis grounded in your parcel\u2019s zoning and live cost data, run the address in UnlockLand and always confirm with your local planning department.

How the math works

Five simple steps take you from a lot size to a margin. Understanding them is half the point of the tool.

1
Buildable area
Lot size × allowed FAR gives the maximum floor area you could build.
2
Unit count
Buildable area ÷ average unit size estimates how many units fit.
3
Total cost
Land + hard construction cost + soft costs gives your all-in basis.
4
Finished value
Units × value per unit estimates the gross value when complete.
5
Margin
Profit ÷ total cost shows whether the deal clears a development margin.

See where the margin lives — and where it breaks

A back-of-envelope read is only useful if you can stress it. Watch how the margin moves as build cost and unit value shift.

Margin sensitivitybuild cost × value/unit
Cost \ Val
$440K
$486K
$520K
$560K
$200/sf
21.4%
27.0%
31.1%
36.0%
$220/sf
17.2%
22.6%
26.5%
31.2%
$240/sf
13.4%
18.6%
22.3%
26.8%
$265/sf
8.9%
13.8%
17.4%
21.6%
Healthy ≥20% Marginal 12–20% Thin <12%
Verdict bands
Healthy≥ 20%
Marginal12–20%
Thin / pass< 12%
This estimate ignores parking, setbacks, and financing. Confirm the real envelope in UnlockLand before you act.

Go deeper

Guide
Feasibility Report Guide
Turn these numbers into a defensible report.
Playbook
Multiplex Playbook
Apply the math to a real multiplex deal.
Path
New Developer
Learn what each input really means.
Reference
Zoning Glossary
FAR, coverage, setbacks and more, defined.

Trade estimates for real numbers

UnlockLand pulls your parcel\u2019s actual zoning, buildable area, and cost data — no guessing at FAR or coverage.