How Many Square Feet Is a 30x30 Room?
A 30 ft × 30 ft room equals 900 square feet. Use the calculator below to double-check or customize with waste and cost.
Last updated:Tip: If you only have the diameter, divide by 2 to get the radius.
L-shape = two rectangles sharing a corner.
Add one row per rectangle and we'll sum them.
Key Measurements for a 30x30 Room
| Metric | Value |
|---|---|
| Floor area | 900 sq ft |
| Floor area (m²) | 83.61 m² |
| Floor area (sq yd) | 100.00 sq yd |
| Perimeter | 120 ft |
| Wall area (8 ft ceiling) | 960 sq ft |
| Wall area (9 ft ceiling) | 1,080 sq ft |
| Wall area (10 ft ceiling) | 1,200 sq ft |
Common Uses for a 30x30 Space
- ADU
- shop / 3-car garage
At 900 sq ft, this falls in the xlarge category — best suited for two-car garages, workshops, or open great rooms.
Best Furniture Layout for a 30x30 Room
At 900 sq ft, a 30x30 ADU behaves like a small building bay — plan vehicle, equipment, or storage aisles first (typically 4–5 ft wide), then fill perimeter walls with shelving or workbenches. The square footprint determines whether you park lengthwise or crosswise.
- Two-car garage: two vehicles parked nose-in with 4 ft center aisle (typical 30x30 bay).
- Great-room: large sectional + dining for 8 + piano or desk alcove.
- Home gym: rack, bench, treadmill, and mat zone with 3 ft clearance all around.
30x30 vs Other Common Room Sizes
If you are deciding between two footprints, compare total square footage and how each layout affects furniture clearance — not just the length and width numbers.
- 24×36 — saves 36 sq ft versus 24×36 — tighter furniture layout.
- 24×40 — adds 60 sq ft over 24×40 — more seating or storage options.
How Much Flooring Will You Need?
Wondering how much flooring do I need for a 30x30 room? The floor area is 900 sq ft — buy that much plus a waste allowance:
| Flooring Type | Waste % | Buy This Much |
|---|---|---|
| Laminate / LVP (plank) | 10% | 991 sq ft |
| Hardwood | 10% | 991 sq ft |
| Ceramic tile (straight) | 10% | 991 sq ft |
| Ceramic tile (diagonal) | 15% | 1,035 sq ft |
| Carpet | 10% | 991 sq ft (111 sq yd) |
Need an exact estimate? Use our Flooring Calculator for plank count, or the Tile Calculator for boxes of tile.
How Many Gallons of Paint for a 30x30 Room?
With 8 ft ceilings you'll paint about 960 sq ft of wall. A gallon covers ~350 sq ft, so you'll need 3 gallons per coat and 6 gallons for two coats.
Detailed breakdown on our Paint Calculator.
Is a 30x30 Room Big?
This size is typical of a two-car garage or a very large open living space.
How Much Does It Cost to Build a 30x30 Room?
At typical US rates of $150–$300 per sq ft for new construction, a 30x30 addition would cost roughly $135,000–$270,000. For remodels:
- Basic flooring replacement: $2,700–$9,000
- Mid-range remodel: $45,000–$90,000
- Full gut renovation: $90,000–$225,000
Refine with our Cost per Square Foot Calculator.
Frequently Asked Questions
How many square feet is 30x30?
30 × 30 = 900 square feet.
How many square meters is 30x30?
83.61 m².
How many tiles will fit in a 30x30 room?
Depends on tile size. 12"×12" tiles = 991 tiles (with 10% waste). See our Tile Calculator for 6", 18", and 24" sizes.
How much carpet do I need for a 30x30 room?
100.00 sq yd minimum, or 110.00 sq yd with 10% waste for cuts and seams.
How many gallons of paint for a 30x30 room?
About 960 sq ft of wall at 8 ft ceilings. One coat needs 3 gallons; two coats need 6 gallons at 350 sq ft per gallon.
How much flooring do I need for a 30x30 room?
900 sq ft of floor area. With a 10% waste factor, order 991 sq ft of laminate, hardwood, or LVP. See the Flooring Calculator for box counts.
What furniture fits in a 30x30 room?
Two-car garage: two vehicles parked nose-in with 4 ft center aisle (typical 30x30 bay).