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Room Size Calculator

Calculate the floor area and volume of a room from its length, width and ceiling height.

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🇩🇰 All calculations are based on Danish rules, rates, and currency (DKK). This calculator is translated for convenience but applies exclusively to Denmark.

Room Size Calculator — Area and Volume

Understanding a room's dimensions is important for interior planning, HVAC sizing, and building regulations. This calculator takes the length, width and ceiling height of a rectangular room and returns both the floor area in square meters and the total volume in cubic meters. These figures are essential when choosing ventilation systems, estimating heating needs or planning furniture layouts.

How the Calculation Works

The floor area is calculated by multiplying length by width. The volume is the floor area multiplied by the ceiling height. Both results are given in standard metric units. The wall area is also computed to help with painting or wallpapering estimates, calculated as the perimeter multiplied by the ceiling height.

Practical Uses

Architects, interior designers and homeowners all benefit from quick room size calculations. In Denmark, room volumes are particularly relevant for building code compliance and energy performance certificates. Use this tool whenever you need accurate room dimensions for renovation planning or property documentation.

Frequently Asked Questions

Why is room volume important?

Room volume is essential for sizing ventilation systems, calculating heating needs, and meeting building code requirements. In Denmark, minimum room volumes are specified in building regulations for different room types, and energy performance calculations use volume data.

What is the standard ceiling height in Danish homes?

The standard ceiling height in Danish homes is typically 2.40-2.60 metres. Danish building regulations require a minimum ceiling height of 2.30 metres for habitable rooms. Older buildings may have higher ceilings of 2.80-3.20 metres, especially in Copenhagen apartments.

How do I calculate wall area for painting?

Wall area is calculated as the perimeter (2 x length + 2 x width) multiplied by the ceiling height. Subtract the area of windows and doors for a more accurate estimate. One litre of paint typically covers 8-12 m² depending on the surface and paint type.

What is the minimum size for a bedroom?

According to Danish building regulations, a bedroom must be at least 7 m² to count as a habitable room. However, most experts recommend at least 10-12 m² for a comfortable single bedroom and 14-16 m² for a double bedroom.

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