# Room Area Calculator

Calculate the area of rectangular, L-shaped, and U-shaped rooms. Get total area in sq ft and sq m plus perimeter for flooring, painting, and renovation.

## What this calculates

Not every room is a simple rectangle. This calculator handles rectangular, L-shaped, and U-shaped rooms so you can accurately estimate floor area for flooring, painting, carpet, and other renovation projects. Enter your main dimensions and any cutout sections to get precise results.

## Inputs

- **Room Shape** — options: Rectangular, L-Shaped, U-Shaped — Select the overall shape of your room
- **Main Length** (ft) — min 0 — Overall length of the room
- **Main Width** (ft) — min 0 — Overall width of the room
- **Cutout Length** (ft) — min 0 — Length of the cutout section (L-shaped or U-shaped rooms)
- **Cutout Width** (ft) — min 0 — Width of the cutout section (L-shaped or U-shaped rooms)

## Outputs

- **Total Area** (sq ft) — Total floor area of the room
- **Total Area** (sq m) — Total floor area in metric units
- **Perimeter** (ft) — Total wall perimeter of the room

## Details

Calculating the area of a standard rectangular room is simple: Area = Length x Width. However, many rooms have alcoves, bump-outs, or L-shaped layouts that require subtracting cutout sections from the total rectangle.

For L-shaped rooms, the calculator treats the space as a full rectangle minus one corner cutout. For U-shaped rooms, it subtracts two equal cutouts from opposite corners. The perimeter is also calculated by tracing the full boundary of the room shape, which is essential for baseboards, crown molding, and wainscoting estimates.

When measuring your room, always measure at floor level and include any closets or alcoves you want in the total. For irregularly shaped rooms that don't fit these patterns, break the room into multiple rectangles, calculate each separately, and add the results together.

## Frequently Asked Questions

**Q: How do I measure an L-shaped room?**

A: Measure the overall length and width as if the room were a complete rectangle. Then measure the length and width of the missing corner section (the cutout). The calculator subtracts the cutout from the full rectangle to give you the actual floor area.

**Q: What if my room has more than two cutouts?**

A: For rooms with complex shapes beyond L or U configurations, break the room into individual rectangles. Calculate each rectangle's area separately and add them together for the total. You can use the rectangular option for each section.

**Q: Why do I need the perimeter measurement?**

A: The perimeter tells you the total length of walls around the room. This is essential for estimating baseboards, chair rails, crown molding, wainscoting, and wallpaper borders. For L-shaped rooms, the perimeter is longer than a simple rectangle of the same area.

**Q: How do I convert square feet to square yards for carpet?**

A: Divide the square footage by 9 to get square yards. For example, a 300 sq ft room needs approximately 33.3 square yards of carpet. Always add 10% for waste and seams.

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Source: https://vastcalc.com/calculators/conversion/room-area
Category: Conversion
Last updated: 2026-04-21