CALCULATE WITH CONFIDENCE

Real Estate & Housing · Property measurement

Gross External Building Area Schedule Calculator

Combine entered external floor-outline areas while reporting external and sheltered components separately.

Real Estate & Housing

Enter your property scenario

Exact entered decimals · no live property data
Gross External Building Area Schedule Calculator — visual relationshipUses the current inputs
Gross External Building Area Schedule Calculat…— · 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 Gross External Building Area Schedule Calculator measure?

Combine entered external floor-outline areas while reporting external and sheltered components separately. It turns documented dimensions, schedules, or planning assumptions into transparent arithmetic while keeping the chosen measurement basis visible.

The calculation

Reported external schedule total = enclosed external floor areas + separately entered external or sheltered areas.

Worked measurement scenario

Enclosed floors of 1,100 and 1,050 plus 120 external and sheltered area total 2,270 area units.

What the result does not establish

Use the exact applicable standard. IPMS 1, GEA, and local external-area conventions are not interchangeable; this tool never classifies a balcony, canopy, void, party wall, or sheltered area for you. The result does not classify spaces, establish legal boundaries, verify a survey, interpret a planning code, or determine development approval.

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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

Reported external schedule total = enclosed external floor areas + separately entered external or sheltered areas.

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

Enclosed floors of 1,100 and 1,050 plus 120 external and sheltered area total 2,270 area units.

Reported external schedule total = enclosed external floor areas + separately entered external or sheltered areas.

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

Use the exact applicable standard. IPMS 1, GEA, and local external-area conventions are not interchangeable; this tool never classifies a balcony, canopy, void, party wall, or sheltered area for you.

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