How do I calculate an L-shaped room?

Split it into two rectangles and add both as separate areas. The total adds them together automatically, which is exactly what an L-shape is.

What if my room isn't a rectangle, circle, or triangle?

Approximate it with the closest combination of these shapes. Split an irregular area into a few simpler ones and add them all.

Does the circle area use radius or diameter?

Radius: half the distance across the circle.

Square Footage Calculator

Add up the square footage of multiple rooms or areas: rectangles, circles, and triangles.

How we calculate it

Total area is the sum of each shape you add: Length × Width for rectangles, π × Radius² for circles, and Base × Height / 2 for triangles, converted between ft², yd², and m² as needed.

Understanding your estimate

A living room is rarely just a rectangle. A closet cut into one corner, a bay window pushing out from a wall, a hallway that only sort of belongs to the room next to it, real rooms are made of a few simple shapes stuck together, not one clean box. This calculator adds them up instead of asking you to pretend your floor plan is simpler than it is.

An L-shaped room, added up

Say your living room is a 15 ft by 12 ft rectangle with a 6 ft by 4 ft closet nook cut into one wall.

Main rectangle: 15 × 12 = 180 ft².
Nook: 6 × 4 = 24 ft².
Total: 180 + 24 = 204 ft².
That's it. No third formula, no L-shape button. Two rectangle entries, added.

Why there's no L-shape option

The calculator offers three shapes, rectangle, circle, triangle, and an L-shaped room isn't a fourth one. It's two rectangles that happen to share a wall. Give it a name and its own formula and you'd need a fifth for a T-shaped room, a sixth for a room with two nooks, and so on, chasing every floor plan shape a house can have. Add rectangles instead and any of those already work, for free, with a new entry in the same list, never a new option that has to exist first. A new rectangle row starts at 10 ft by 10 ft (3 m by 3 m in metric) until you type your own numbers over it.

Why the total never rounds

180 plus 24 stays 204, not rounded to a whole number the way a bag count or a board count would be. This calculator measures. It doesn't tell you how many of something to buy, so there's nothing to round toward, the same reasoning behind an unrounded total on this site's Gravel Calculator: a number you report or hand to another calculator, not a purchase quantity you're protecting against running short.

Why the result shows each area, not just the total

Alongside 204 ft², the result keeps 180 and 24 as their own numbers, in the same order you entered them. Add a fourth room to a multi-room estimate and you can still see what each one contributed, instead of a single total that hides whether the big number came from one room or five. That breakdown exists for exactly one reason: someone comparing rooms, or feeding a future calculator that needs area per room instead of area total, has more to work with than a sum alone gives them.

Why there's no waste factor here

Concrete, tile, mulch, calculators like those add a waste factor on top of the raw number, because what they're estimating is material you're about to cut, spill, or break. This one doesn't, because area itself doesn't spoil or get cut short, measuring a floor doesn't consume any of the floor. If you're about to hand this total to a flooring or paint calculator to figure out material, that's where the waste factor belongs, on the calculator that turns area into something you buy, not on the one that just adds up how big the room is.