CALCULATE WITH CONFIDENCE

Real Estate & Housing · Property measurement

Floor Area Ratio Calculator

Compare entered total floor area with entered site area.

Real Estate & Housing

Enter your property scenario

Exact entered decimals · no live property data
Floor Area Ratio Calculator — visual relationshipUses the current inputs
Floor Area Ratio Calculator— · measured basis
This visual explains the entered property relationship. It does not estimate local prices, approval, legal terms, or future market performance.
  1. 1EnterProvide the known values
  2. 2CalculateResults update automatically
  3. 3VerifyReview the details and units
Try an example

Use one consistent area unit and measurement basis unless a unit selector is provided. Separate schedule rows with semicolons or new lines, and row values with commas. Your values stay in this browser.

Real-estate result

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Enter valid values to see the result.

Your entries are calculated in this browser and are not submitted to 365CALCS.COM.

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Understand the property measurement

What does the Floor Area Ratio Calculator measure?

Compare entered total floor area with entered site area. It turns documented dimensions, schedules, or planning assumptions into transparent arithmetic while keeping the chosen measurement basis visible.

The calculation

Floor area ratio = total counted floor area ÷ site area.

Worked measurement scenario

A counted floor area of 2,400 m² on a 1,200 m² site has a floor area ratio of 2.0.

What the result does not establish

Planning authorities define which floors and spaces count. This arithmetic does not determine zoning compliance or development rights. The result does not classify spaces, establish legal boundaries, verify a survey, interpret a planning code, or determine development approval.

Explore all Property Measurement & Site Planning calculators

Quick guide

How to use this calculator

  1. Enter amounts from the same property scenario and use consistent periods and units.
  2. Use visitor-entered rates and allowances from your own documents rather than assuming a local rule.
  3. Review the component results and the calculator-specific decision boundary before acting.

Calculation method

Calculation method

Floor area ratio = total counted floor area ÷ site area.

Entered fixed decimals remain exact through rational arithmetic. Planar distance outputs that require square roots use bounded numerical evaluation. Values round only for display, and unsupported or undefined states return an explicit message.

Worked example

Worked example

A counted floor area of 2,400 m² on a 1,200 m² site has a floor area ratio of 2.0.

Floor area ratio = total counted floor area ÷ site area.

Supported inputs

Precision and limits

International scope

No currency, market price, interest rate, tax, tenancy rule, planning code, lender policy, or measurement definition is supplied automatically.

Scenario, not a decision

Results are arithmetic scenarios from visitor-entered values—not an appraisal, loan approval, legal interpretation, planning determination, forecast, or professional recommendation.

Precision and privacy

Inputs accept bounded plain decimals and remain in this browser. The engine prevents invalid denominators and misleading non-finite results.

Calculator-specific boundary

Planning authorities define which floors and spaces count. This arithmetic does not determine zoning compliance or development rights.

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