Room Size Calculator – Guide & Formulas
Calculate the total floor area, perimeter, and cubic volume of any room in feet, meters, yards, or inches.
Calculate the floor area, perimeter, and cubic volume of a room for floor design, drywall installations, or furniture placement. Supports rectangular and complex multi-part layouts.
Key Takeaway
Use the free Room Size Calculator to calculate the total floor area, perimeter, and cubic volume of any room in feet, meters, yards, or inches. Get instant results with step-by-step explanations.
How to Use the Room Size Calculator
- Enter the room width, length, and height dimensions.
- Select your preferred measurement units.
- Check the calculated area, perimeter, and cubic volume in standard and metric measures.
The Formula
Variable Definitions
- A: Floor area
- P: Perimeter length
- V: Cubic volume capacity
Measuring a Master Bedroom
Calculate the area, perimeter, and volume of a master bedroom that is 14 feet wide, 16 feet long, and has 9-foot ceilings.
- Step 1: Calculate floor area: 14 ft × 16 ft = 224 square feet.
- Step 2: Calculate perimeter: 2 × (14 + 16) = 60 linear feet of baseboards.
- Step 3: Calculate volume: 224 sq ft × 9 ft height = 2,016 cubic feet.
- Step 4: Compare results to design requirements.
Frequently Asked Questions
How many gallons of paint do I need based on room size?
A standard gallon of paint covers about 350-400 square feet. To paint the walls, calculate the total wall area: perimeter multiplied by height, minus doors and windows.
How is carpet or flooring sold?
Carpet is often sold in square yards (9 square feet = 1 square yard). Our calculator provides quick conversions to help you order materials.
What is a standard ceiling height?
The standard ceiling height in modern residential construction is 8 feet (approx. 2.4 meters) or 9 feet (approx. 2.7 meters).