The Room Dimension Calculator helps you quickly find the exact dimensions and area of any room. Simply enter your room’s length, width, and height to calculate floor area, wall area, and volume. Perfect for home renovation, furniture planning, or interior design projects.
Advanced Room Dimension Calculator
Comprehensive multi-purpose calculator for all your room measurement needs
Room Area Calculator
Calculation Theory & Formulas
Area Calculations
Rectangle: Area = Length × Width
Square: Area = Side × Side
Circle: Area = π × (Diameter/2)²
Wall Area: Perimeter × Height
Total Surface Area: Floor + Ceiling + Walls
Unit Conversions:
- 1 square foot = 0.092903 square meters
- 1 square meter = 10.764 square feet
- 1 square inch = 6.4516 square cm
Paint Calculations
Coverage: 1 gallon covers ~350 sq ft
Metric: 1 liter covers ~10 sq meters
Wall Area: 2(L×H) + 2(W×H)
Subtract: Door (20 sq ft) + Windows (15 sq ft each)
Total Paint: (Wall Area + Ceiling Area) × Coats ÷ Coverage
Pro Tips:
- Add 10-15% extra for touch-ups
- Textured surfaces need 20% more paint
- Dark to light colors need extra coats
Room Capacity
Basic Formula: Room Area ÷ Space per Person
Space Requirements:
- Theater: 6 sq ft per person
- Classroom: 8 sq ft per person
- Banquet: 10 sq ft per person
- Conference: 12 sq ft per person
- Cocktail: 4 sq ft per person
- Boardroom: 15 sq ft per person
Safety Margin: Reduces capacity by selected percentage for comfort and safety codes
Flooring Calculations
Base Area: Length × Width
With Waste: Base Area × (1 + Waste %)
Total Cost: Total Area × Price per Unit
Waste Factors:
- 5% – Simple rectangular rooms
- 10% – Standard installation
- 15% – Diagonal or complex layouts
- 20% – Intricate patterns or cuts
Important Notes & Best Practices
Measurement Tips:
- Always measure twice for accuracy
- Round up to the nearest half unit
- Account for irregular shapes by dividing into rectangles
- Consider room transitions and thresholds
Cost Considerations:
- Material costs vary by quality and brand
- Factor in installation and labor costs
- Consider long-term maintenance costs
- Get multiple quotes for accuracy
Supported Currencies & Units
Currencies
USD, EUR, GBP, CAD, AUD, INR
Length Units
Feet, Meters, Inches, Centimeters
Area Units
Square Feet, Square Meters, Square Inches
Room Dimension Calculator FAQ
What is the Room Dimension Calculator?
The Room Dimension Calculator is an online tool that calculates a room’s dimensions, area, and volume for planning and design purposes.
Can it handle irregularly shaped rooms?
Yes. For irregular rooms, you can break them into smaller sections, calculate each separately, and then add the results together.
Does it support both metric and imperial units?
Yes. You can choose between centimeters/meters or inches/feet for accurate measurements in your preferred unit.
Is the Room Dimension Calculator free to use?
Yes. The tool is free and works online without any software installation.