Carpet To Super Built Up Ratio Calculator

Work out carpet to super built up ratio instantly with clear inputs, formula shown and shareable results.

About Carpet To Super Built Up Ratio Calculator

The carpet to super built-up ratio tells you how much of what you are paying for you can actually walk on. A ratio of 70-75 percent is typical, meaning a loading of 33-43 percent. Built-up area sits between the two and is usually about ten percent above carpet, covering wall thickness and balconies.

Formula

Ratio and loading

Carpet ratio = carpet / super built-up; loading = super built-up / carpet - 1

Worked example

With the default values below, Carpet To Super Built Up Ratio Calculator returns Carpet as share of super built-up of 72.00%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Carpet areaminimum 0.1 ft²: 900 ft²
Super built-up areaminimum 0.1 ft²: 1,250 ft²

Results

Carpet as share of super built-up: 72.00% %
Loading applied: 38.89% %
Estimated built-up area: 990.0 ft²
Area not usable: 350.0 ft²

Step by step

1Values used
2Ratio and loading
3Carpet as share of super built-up= 72.00 %
4Loading applied= 38.89 %
5Estimated built-up area= 990.0 ft²
6Area not usable= 350.0 ft²

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Carpet To Super Built Up Ratio figure worked out?

Carpet ratio = carpet / super built-up; loading = super built-up / carpet - 1. The carpet to super built-up ratio tells you how much of what you are paying for you can actually walk on.

Why do developers quote super built-up area?

It lowers the apparent rate per square foot. The same flat at a given price shows a much better headline rate on 1250 super built-up feet than on 900 carpet feet.

What values do I need to enter?

This calculator takes 2 inputs: Carpet area, Super built-up area. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.