Description
Calculate lot-coverage fraction after a supplied footprint exclusion.
Planning measurements depend on lot boundaries, excluded area, frontage, ground datum and the unit or person being served. A footprint fraction and a width margin answer different geometric questions. Accessibility, easement rights and zoning compliance depend on verified conditions and applicable requirements beyond a supplied flag or numerical comparison.
Calculate lot-coverage fraction after a supplied footprint exclusion.
When to use this tool
Use Zoning Lot Coverage Excluded Area when you already have grossFootprintArea, explicitlyExcludedArea, lotArea and need to calculate lot-coverage fraction after a supplied footprint exclusion.
How to use the tool and how it works
- Enter grossFootprintArea, explicitlyExcludedArea, lotArea. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read countedFootprintArea, coverageFraction. Use the output convention below.
Require grossFootprintArea>=0, excluded area within gross and lotArea>0; return gross-excluded and that counted area/lot area.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| grossFootprintArea | Gross Footprint Area | Required. Finite number; minimum 0. |
| explicitlyExcludedArea | Caller-declared excluded footprint, within [0,gross footprint]. | Required. Finite number; minimum 0. |
| lotArea | Lot Area | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| countedFootprintArea | Counted Footprint Area | Required. Finite number. |
| coverageFraction | Counted footprint/lot area; may exceed one. | Required. Finite number. |
{
"input": {
"grossFootprintArea": 200,
"explicitlyExcludedArea": 20,
"lotArea": 600
},
"output": {
"countedFootprintArea": 180,
"coverageFraction": 0.3
}
}Limitations and assumptions
- Exclusions are caller assumptions; coverage may exceed one and the calculation does not determine applicable zoning or compliance.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use a verified survey, route inspection and the applicable planning definitions for actual coverage, access or height questions. Separate a supplied geometric margin from the documentation needed to establish an easement or accessibility condition.
References
Similar or alternative tools
- Urban Block Facade Gap Fraction
Calculate marked facade gaps as a share of total frontage.
- Planning Height Ground Datum Difference
Calculate a planning height relative to a supplied ground datum.