Productive ToolboxRoom Volume Calculator
Compute volume of interior spaces.
Room Volume Calculator
Calculate interior space volume for HVAC design, air purifier sizing, and room capacity planning. Supports multiple room shapes.
Settings
ROOM VOLUME
Rectangular Room Dimensions
Shape Preview
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What is a Room Volume Calculator?
A Room Volume Calculator helps you calculate the total interior space volume of a room by entering its dimensions. The calculator supports multiple room shapes including rectangular, cylindrical, and triangular/attic rooms, providing instant results in cubic meters, cubic feet, and liters.
This tool is essential for HVAC design, air purifier sizing, sound treatment planning, and room capacity calculations. It's used by architects, engineers, homeowners, and construction professionals.
Volume Calculation Formulas
Rectangular Room
Example: 5m × 4m × 3m = 60 m³
Cylindrical Room
Example: π × 3² × 4 = 113.1 m³
Triangular/Attic Room
Example: 6m × 5m × (2.5m + 4m) ÷ 2 = 97.5 m³
Key Features
- Multiple Room Shapes: Rectangular, cylindrical, and triangular/attic rooms
- Real-Time Calculations: Results update instantly as you type
- Unit Conversions: See volume in m³, ft³, and liters simultaneously
- Room Presets: Quick-fill common room types (bedroom, office, etc.)
- HVAC Tools: Calculate air changes per hour (ACH)
- Air Purifier Sizing: Get CADR recommendations
- Calculation History: Save and review past calculations
- Export Functionality: Download results as text files
- Mobile Responsive: Works on all devices
Common Use Cases
🌬️ HVAC Design
Calculate room volume to determine heating/cooling requirements and air changes per hour.
💨 Air Purifier Sizing
Determine the correct CADR rating for effective air purification in your space.
🔊 Sound Treatment
Calculate volume for acoustic panel placement and sound absorption calculations.
🏗️ Construction Planning
Estimate material requirements and room capacity for building projects.
Unit Conversion Reference
Cubic Meters to Cubic Feet:
1 m³ = 35.3147 ft³
Cubic Feet to Cubic Meters:
1 ft³ = 0.0283168 m³
Cubic Meters to Liters:
1 m³ = 1,000 liters
HVAC Guidelines
Air Changes Per Hour (ACH) is a measure of how many times the air in a room is completely replaced in one hour. Different spaces require different ACH rates:
- Residential rooms: 0.5-2 ACH
- Offices: 4-6 ACH
- Kitchens: 15-20 ACH
- Bathrooms: 6-8 ACH
- Laboratories: 6-12 ACH
How to Use the Room Volume Calculator
- 1Pick the room shape: Choose rectangular, cylindrical or triangular (attic).
- 2Choose the unit: Select feet or meters, or start from a room preset.
- 3Enter the dimensions: Type length, width and height, the radius, or the wall and peak heights for an attic.
- 4Read the volume: See the volume in every unit, the air changes per hour for an airflow in CFM, and the CADR to look for in an air purifier.
Frequently Asked Questions
How do I calculate room volume?
Length × width × height. A 12 × 15 ft room with an 8 ft ceiling is 1,440 cu ft, or 40.8 m³ (40,800 liters).
How do I work out the volume of an attic room?
For a triangular cross-section, volume = ½ × width × peak height × length. For knee walls, add the rectangular part below the slope to the triangle above it.
What are air changes per hour (ACH)?
How many times the room's air is replaced each hour: ACH = CFM × 60 ÷ volume in cu ft. 120 CFM in a 1,440 cu ft room gives 5 ACH. ASHRAE 62.2 sets minimum ventilation for homes.
What CADR do I need for an air purifier?
AHAM recommends a CADR of at least two-thirds of the floor area in square feet, for rooms with 8 ft ceilings: a 180 sq ft room needs a CADR of 120 CFM. The calculator uses the room volume ÷ 12, which is the same rule and also adjusts for taller ceilings.
How do I convert cubic feet to cubic meters?
Multiply by 0.0283. 1 m³ = 35.31 cu ft = 1,000 liters.
Start Calculating Room Volume Now
Whether you're designing HVAC systems, sizing air purifiers, planning acoustics, or calculating room capacity, this Room Volume Calculator provides fast, accurate results with professional-grade features. Select your room shape above and get instant calculations with automatic unit conversions.
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