Shape
Volume calculator
Room Volume Calculator
Enter room dimensions and calculate room volume for a simple or shaped space.
Calculating
Unit converter
Cubic volume unit converter
1 m³35.31 ft³
ft³35.31 ft³
yd³1.31 yd³
liters1,000 liters
US gal264.17 US gal
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Open a focused calculator when the main keyword changes.
How to use
How to calculate volume for your project
Switch between these options to match the way you are using the calculator right now.
Enter one shape and read the live total
- Choose the shape that matches the object you are measuring.
- Enter the required dimensions and confirm the input unit.
- Use the result panel to read cubic meters, cubic feet, liters, or gallons.
Start with the main room length, width, and height.
Guide
Room volume calculator guide
Use this room volume calculator when the main task is finding the volume of a room, storage space, or shaped interior.
Room volume formula
For a rectangular room, room volume = length x width x height. For L-shaped or irregular rooms, split the room into sections and add the volumes.
Example room volume calculation
A room is 14 ft long, 11 ft wide, and 8 ft high.
14 x 11 x 8 = 1232
The room volume is 1232 ft3.
Unit notes
- Use cubic feet for many US room and air-volume references.
- Use cubic meters when room dimensions are measured in metric units.
- For irregular rooms, measure each section separately before adding them.
Best uses
- Bedrooms and living rooms
- Closets
- Storage rooms
- Warehouses
- L-shaped rooms
Common mistakes
- Using floor area without multiplying by ceiling height.
- Ignoring alcoves, returns, or bay sections in an irregular room.
- Using outside building dimensions when interior volume is needed.
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How do I calculate room volume?
For a rectangular room, multiply length by width by height. For shaped rooms, calculate each section and add the volumes.
Can I calculate an L-shaped room?
Yes. Use an L-shaped layout or split the room into rectangular sections and combine them.
Is room volume the same as floor area?
No. Floor area uses length and width. Room volume also includes height.
Which unit should I use for room volume?
Use the unit required by your reference. Cubic feet and cubic meters are the most common room volume outputs.
Can a sloped ceiling be estimated?
A simple sloped section can be estimated with a triangular prism component, but detailed interiors may need a more specific model.
This calculator provides estimates based on the dimensions and assumptions you enter. For engineering, structural, freight, or purchasing decisions, verify the result with a qualified professional or supplier.