JB PARCELLot Yield Calculator
Raw acreage does not become lots one for one. Roads, detention, open space, and unbuildable ground take a real cut first. This shows what is left and what each finished lot costs you.
How this calculator works
Start with gross acreage and take out everything you cannot plat. Floodplain and wetlands come off first as a hard acreage number. Then roads and right of way, typically fifteen to twenty-five percent depending on how big the lots are and how the streets run. Then required open space and detention, which is set by the local ordinance. Then whatever else is unbuildable: steep slope, rock, easements, and the awkward corners of an irregular boundary.
What is left is net buildable acreage. Multiply by 43,560 to get square feet, divide by your minimum lot size, and round down. On forty gross acres with a third lost to roads and open space, a fifth-acre minimum yields about 134 lots. Change the minimum to a quarter acre and it drops to roughly 107. That single zoning number is the biggest driver of what the land is worth.
Cost per finished lot is land plus hard development costs plus soft costs, all divided by lot count. Hard costs are grading, streets, curb, water, sewer, storm, and dry utilities. Soft costs are engineering, survey, permits, impact fees, legal, and the interest you carry during development, usually twelve to eighteen percent of hard costs.
The residual land value output is how developers actually bid raw ground. Start from what finished lots sell for, subtract commissions, subtract every development cost, subtract the margin you require, and what remains is the most you can pay for the dirt. Bidding from an asking price instead of from residual value is how developers overpay.
Worked example: 40 acres in a growing Middle Tennessee county
Forty gross acres, fifth-acre minimum lots, standard road and open space requirements, $1.4 million land cost.
| Net buildable acres | 26.80 |
|---|---|
| Buildable lots | 134 |
| Land cost per lot | $10,448 |
| Improvement plus soft cost per lot | $43,320 |
| All-in cost per lot | $53,768 |
| Finished lot price | $95,000 |
| Gross margin per lot | $38,382 |
| Margin | 41.6% |
Strong on paper. Now stress it. If the county requires quarter-acre minimums instead, yield drops to 107 lots and land cost per lot jumps to $13,084 while revenue falls by $2.5 million. Confirm the minimum lot size and open space requirement with the planning department before you sign anything, because that one ordinance line moves the project by seven figures.
Questions investors ask
How many lots per acre can I expect?
It depends entirely on the minimum lot size and how much of the site is consumed by roads and open space. As a rough guide, a fifth-acre minimum with typical requirements yields around three to three and a half lots per gross acre, and a half-acre minimum yields around one and a third. Get a preliminary yield plan from a civil engineer before you rely on any number, including this one.
What percentage goes to roads?
Fifteen to twenty-five percent for typical single-family subdivisions. Smaller lots need more street per lot, so tighter lot sizes push toward the high end. Long narrow parcels and sites requiring a second access point also push it up. Rural large-lot developments with shared drives can come in well under fifteen percent.
What is residual land value?
The price you can pay for raw ground and still hit your required margin. Work backwards: finished lot revenue, minus commissions, minus development hard and soft costs, minus your margin, equals what the dirt is worth to you. It is the only defensible way to bid land, because an asking price tells you what the seller wants rather than what the project supports.
What should I verify before buying development land?
Zoning and the minimum lot size in that district, whether sewer is available or you are on septic, water capacity and pressure, floodplain mapping, soils and rock, access and any required road improvements, impact fees, and the open space requirement. Also confirm the jurisdiction is actually approving plats right now. Several fast-growing Tennessee counties have used moratoria and sewer capacity limits to slow residential approvals.
How long does a subdivision take?
Eighteen months to three years from purchase to first lot closing is normal for a mid-sized subdivision, longer where rezoning or a sewer extension is involved. Entitlement is usually the unpredictable part, not construction. Every month of that timeline is carrying cost on the land, so model it in the holding cost calculator and make sure your capital can wait.
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Screening a real property? Pull its appraised value, assessed value, acreage, land use, and last recorded sale off the JB PARCEL parcel map and drop the real numbers into this calculator instead of guessing. Coverage runs across every county we carry.