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# Area calculation

## This article explains how the area of Archilogic models is being calculated and why there might be a mismatch between the source floor plan and what is shown in the Archilogic model

When we create a model, we start by setting the scale of the floor plan provided. To set the scale all we need is one clear dimension on the provided floor plan. When provided we establish a pixel to real-world scaling factor within a +/- 5% tolerance.

However, it is possible that the Archilogic model will show slightly different values as stated in the provided floor plan. Here are a few examples of why these values might differ.

• Gross vs Net vs Usable area
There is not a universal method or standard for measuring and displaying floor area notations on all floor plans. Each method serves a particular purpose, but unfortunately not all floor plans communicate which method of measurement was applied. The areas in all Archilogic models are usable floor areas and exclude all walls and columns.
• Multipliers
Some plans used for marketing have been marked up with a multiplier. This is often the case with areas noted as RSF (rentable square feet). The floor areas in our models are based on unbiased calculations with no hidden multipliers.
• No dimensions
When a provided floor plan does not contain a clear dimension, we apply approximate scaling methods based on the average sizes of common elements shown on the provided floor plan. This approximated scaling method can also be compromised by low-resolution floor plans.
• Floor area notations
We have found floor area notations on floor plans to be the least reliable, and the most inaccurate way to set the scale of a model. This can be because the area notations cannot be visually matched with the bound extents from which the calculations were originally generated. For this reason, we try all other available methods for scaling before using the floor area notations.
• Rounding
When we receive floor plans that were intended as marketing material the values stated on them may be rounded up. This may lead to minor differences in the stated values if these floor plans also contain a dimension line that can be used by us for scaling.

The discrepancy can be greater when more than one of these examples are present on the one-floor plan