# Square Footage Calculator

Calculate square footage for any room or space. Supports rectangular, L-shaped, and triangular shapes with a room quantity multiplier. Get results in sq ft, sq m, and acres.

## What this calculates

Whether you are buying flooring, planning a paint job, or listing a property, you need accurate square footage. This calculator handles rectangular, L-shaped, and triangular spaces and lets you multiply by the number of identical rooms so you get one total for the whole project.

## Inputs

- **Room Shape** — options: Rectangular, L-Shaped, Triangular — Select the shape of your room or space
- **Length** (ft) — min 0 — Main length of the room (or base for triangles)
- **Width** (ft) — min 0 — Main width of the room (or height for triangles)
- **Second Section Length** (ft) — min 0 — Length of the second section (L-shaped rooms only)
- **Second Section Width** (ft) — min 0 — Width of the second section (L-shaped rooms only)
- **Number of Identical Rooms** — min 1, max 100 — Multiply by this number for identical rooms or spaces

## Outputs

- **Square Footage per Room** (sq ft) — Area of a single room or space
- **Total Square Footage** (sq ft) — Combined area for all rooms
- **Total Area** (sq m) — Total area in square meters
- **Total Area** (acres) — Total area in acres (useful for large spaces)

## Details

The core formula for a rectangular room is simple: Square Footage = Length x Width. For other shapes the calculator adjusts automatically:

  - Rectangular: Length x Width

  - L-Shaped: (Main Length x Main Width) + (Second Length x Second Width). Think of it as two rectangles joined together.

  - Triangular: 0.5 x Base x Height. Useful for attic spaces, dormer nooks, or oddly shaped alcoves.

If you have several identical rooms (like five bedrooms in a hotel), set the quantity field and the calculator multiplies for you.

Common square footage reference points:

  - Small bedroom: 100-150 sq ft

  - Standard bedroom: 150-250 sq ft

  - Living room: 200-400 sq ft

  - Two-car garage: 400-600 sq ft

  - Average U.S. home: roughly 2,300 sq ft

The results also show square meters (1 sq ft = 0.0929 sq m) and acres (1 acre = 43,560 sq ft), which is helpful when comparing land parcels or international listings.

## Frequently Asked Questions

**Q: How do I calculate square footage of a room?**

A: Measure the length and width of the room in feet, then multiply them together. A room that is 12 feet long and 10 feet wide has 120 square feet. If the room is not a simple rectangle, break it into rectangular sections, calculate each, and add them up.

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

A: Split the L into two rectangles. Measure the length and width of each section separately, then enter the first section as the main length and width and the second section in the corresponding fields. The calculator adds them together automatically.

**Q: How many square feet are in an acre?**

A: One acre equals 43,560 square feet. That is roughly the size of a football field without the end zones (which is about 48,000 sq ft). A quarter-acre residential lot is around 10,890 sq ft.

**Q: What is the difference between square feet and square meters?**

A: One square foot equals approximately 0.0929 square meters. To convert sq ft to sq m, multiply by 0.0929. To go the other way, multiply square meters by 10.764 to get square feet.

**Q: Do I include closets when calculating a room's square footage?**

A: For real estate listings, closets are typically included in the total square footage if the ceiling height is at least 7 feet. For flooring or painting projects, measure any space you plan to cover and include it in your total.

---

Source: https://vastcalc.com/calculators/construction/square-footage
Category: Construction
Last updated: 2026-04-08