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Floor Area Ratio Calculator — result sheet
Calculate floor area ratio from total building floor area and site area.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: FAR = total floor area/site area; FAR percentage = FAR × 100.
The ratio compares the sum of included floor areas with the land area supplied for the site.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Total floor area — area units; minimum 0; maximum 1000000000
- Site area — area units; minimum 1.0E-6; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| Total floor area | 2000 |
| Site area | 10000 |
FAR = 0.2, or 20%.
Assumptions and limits
- Both areas use the same unit and site area is positive.
- Which floors, exclusions, bonuses, and measurement rules count is jurisdiction-specific and must be supplied separately.
- This calculator does not determine zoning compliance or permission to build.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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