Room Dimension Calculator - Calculate Area, Wall Surface, Volume & More

Last updated: 11 Jun 2025 | Author: Brij | Review By: Irshad

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Instantly calculate floor area, wall area, room volume, perimeter, and diagonal by entering room length, width, and height.

Measurement Unit:

Length:

Width:

Height:

Room Dimension Calculations

Floor Area:

sq ft

Wall Area:

sq ft

Room Volume:

cu ft

Floor Diagonal:

Floor Perimeter:

Whether you're planning a renovation, estimating paint or flooring, or just curious about your room’s measurements — the Room Dimension Calculator is your handy tool. Enter the room's length, width, and height, and instantly get:

What is the meaning of "Room Dimension"?

Room dimension refers to the measurable size of a room, typically including:

Length – the distance from one end of the room to the other
Width – the distance from one side of the room to the other
Height – the distance from the floor to the ceiling

These three values (Length × Width × Height) are used to calculate the area, volume, and surface measurements of a room. Knowing room dimensions is essential for tasks like furniture placement, flooring, painting, lighting, and heating/cooling planning.

Step by Step Calculation

1. Floor Area

The floor area represents the surface area of the room's floor.

Formula:

$\text{Floor Area} = \text{Length} \times \text{Width}$

2. Wall Area

To find the total wall surface area, calculate the area of the four walls.

Formula:

$\text{Wall Area} = 2 \times (\text{Length} + \text{Width}) \times \text{Height}$

3. Room Volume

The room volume is useful for HVAC planning and storage estimates.

Formula:

$\text{Volume} = \text{Length} \times \text{Width} \times \text{Height}$

4. Floor Perimeter

Useful for baseboards or flooring estimates.

Formula:

$\text{Perimeter} = 2 \times (\text{Length} + \text{Width})$

5. Floor Diagonal

This helps in space planning, especially for large furniture or tiling layout.

Formula:

$\text{Diagonal} = \sqrt{\text{Length}^2 + \text{Width}^2}$

Example Calculation

Given:

Length = 12 ft, Width = 10 ft, Height = 8 ft

1. Floor Area

$12 \times 10 = \boxed{120 \, \text{sq ft}}$

2. Wall Area

$2 \times (12 + 10) \times 8 = 2 \times 22 \times 8 = \boxed{352 \, \text{sq ft}}$

3. Room Volume

$12 \times 10 \times 8 = \boxed{960 \, \text{cu ft}}$

4. Perimeter

$2 \times (12 + 10) = 2 \times 22 = \boxed{44 \, \text{ft}}$

5. Diagonal

$\sqrt{12^2 + 10^2} = \sqrt{244} \approx \boxed{15.62 \, \text{ft}}$

Check out 1 similar Room Dimension Calculator - Calculate Area, Wall Surface, Volume & More :

Room Dimension Calculator - Calculate Area, Wall Surface, Volume & More

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