Free FAR and zoning tool
Calculate current and proposed FAR, maximum floor area, and remaining development capacity before preparing permit drawings.
Enter the project measurements, then select Calculate. Nothing is uploaded or stored.
How to use the calculator
FAR controls development intensity rather than ground coverage. A two-story building can have the same footprint as a one-story building but a higher FAR. Local codes decide whether garages, basements, balconies, mechanical space and other areas are included.
Continue your permit planning
Calculation questions
These answers explain the planning calculation. Verify local definitions before using the result in a permit package.
FAR is usually written as a ratio such as 0.50, 1.0 or 2.5. It can also be expressed as a percentage, but the zoning table normally uses the ratio.
It depends on the local definition of gross floor area. Some jurisdictions exclude qualifying basements while others count all or part of them.
Not by itself. Height, setbacks, lot coverage, parking and design rules can limit the number of stories even when FAR capacity remains.
The design may need less floor area, a different configuration or a variance. Confirm the calculation with the reviewing authority before redesigning.
Need drawings, not just a calculation?
Send the property address, proposed project and any city checklist. We will confirm the drawing scope before you order.
Calculation methodology reviewed August 2026 · Educational planning tool, not a zoning determination or survey.
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