Square Footage / Area Calculator

Add every room and get the total floor area instantly — in square feet and square meters, with an optional cost estimate.

Rooms

Room Name Length Width Area
Total Area
0 sq ft
In Square Meters
0 m²
0
Rooms Added
0 sq ft
Average Room Area
₹0
Est. Cost
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How to Calculate Total Square Footage

Square footage is simply length times width for a rectangular space. Most homes aren't one big rectangle, though, so the accurate way to find total area is to measure each room separately and add the results — exactly what this calculator does as you add rows.

The basic formula

Area = Length × Width

Enter each room's length and width in feet or meters (use the toggle above), and the calculator converts and totals everything in both units automatically.

Carpet, built-up and super built-up area

This distinction matters a lot when comparing your own measurement to a builder's quoted size:

TermWhat it includes
Carpet areaUsable floor space inside the walls — what this calculator measures when you enter room dimensions.
Built-up areaCarpet area + wall thickness + balcony area.
Super built-up areaBuilt-up area + a proportional share of common areas (lobby, stairs, lift, corridors).

A flat advertised at 1,000 sq ft super built-up might only have 700-750 sq ft of actual carpet area — always ask which figure a quoted price or size refers to.

Estimating cost from area

Once you have total square footage, multiplying it by a per-sq-ft rate gives a rough budget — useful for flooring, painting, or basic construction cost planning. Enter a rate in the "Cost Estimate" field to see this instantly; leave it at 0 to skip cost estimation.

For example, a 3-room layout — a 12ft × 10ft bedroom, a 10ft × 10ft bedroom and a 15ft × 12ft living room — totals 120 + 100 + 180 = 400 sq ft (about 37.2 m²). At ₹2,000/sq ft that's an estimated ₹8,00,000. Enter these same figures into the calculator above to reproduce this result.

Frequently Asked Questions

Measure the room's length and width in feet (or meters) and multiply them: Area = Length × Width. For an L-shaped or irregular room, split it into rectangular sections, calculate each section's area separately, and add them together — which is exactly what adding multiple rows in this calculator does.

Divide the square foot value by 10.7639, or multiply by 0.0929, to get square meters. This calculator shows both units side by side automatically, regardless of whether you entered your room dimensions in feet or meters.

Carpet area is the actual usable floor area inside a room's walls (what this calculator measures when you enter room dimensions). Built-up area adds the thickness of the walls and balcony. Super built-up area further adds a proportional share of common areas like lobbies, stairs and lifts — which is why the price-per-sq-ft quoted by builders is usually on super built-up area, a noticeably larger number than carpet area.

Add each room as a separate row with its own length and width, and the calculator sums every row's area into one total. This is more accurate than measuring an entire house as one rectangle, since most homes aren't a single rectangular shape.

Basic residential construction typically ranges from roughly ₹1,500 to ₹2,500 per sq ft depending on city, specification level and finish quality, while premium finishes can go well beyond that. This varies significantly by location and material choice, so treat any per-sq-ft figure as a rough planning estimate, not a quote.

For carpet area (usable floor space, what most people mean by "room size"), measure between the inner wall faces, excluding wall thickness. Only include wall thickness if you're specifically calculating built-up area, which is a different, larger figure used by builders for pricing.

Split the room into rectangular sections (an L-shaped room becomes two rectangles, for example), measure and enter each section as a separate row, and let the calculator add them into one total — the same approach used for multiple rooms.