Square Meter Calculator
Work out the area in square meters of rectangular, L-shaped or triangular rooms and plots from length and width, or from base and height.
Result
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Note: These calculations are for informational purposes only and do not replace professional tax or financial advice. All information without guarantee.
FAQ
Frequently Asked Questions
How do I calculate square meters?
Multiply length times width in meters. For irregular shapes, divide the area into rectangles, triangles, or circles, calculate each separately, and add the results.
How much living space do I need per person?
The German average is about 47 square meters per person. Guidelines suggest a minimum of 13 square meters per person. Family homes typically range from 120-180 square meters.
How do I calculate a triangular area, such as a gable wall?
Select “Triangular” and enter the base and height in meters; the calculator computes base × height / 2. The height is the perpendicular distance from the base to the apex, not the length of the sloping roof edge. Example: a gable wall 8 m wide and 3 m high to the ridge has 8 × 3 / 2 = 12 m² – subtract any window areas afterwards.
Guide
What is the Square Meter Calculator?
The square metre calculator computes the area from length and width and converts between area units.
How does the Square Meter Calculator work?
Enter length and width. For irregular areas you can break them into sub-areas. The calculator adds the sub-areas and shows the result in sqm and other units.
Key Data and Facts
1 m squared = 10,000 cm squared = 0.0001 ha. 1 ha = 10,000 m squared. 1 are = 100 m squared. Living area per WoFlV: balconies 25-50%, areas under 1 m ceiling not counted.
Step-by-Step Guide
How to calculate square metres step by step: 1. Rectangular area: Measure the length and width in metres. m2 = length x width. 2. Irregular rooms: Divide the area into rectangles and triangles. Calculate each sub-area individually and add the results together. 3. Living space according to the WoFlV: Fully countable: rooms with a ceiling height of more than 2 m. At 50 %: rooms with a ceiling height of 1-2 m (sloping ceilings). Not countable: under 1 m ceiling height. Balconies/terraces: 25 % (as a rule). 4. Convert units: 1 m2 = 10,000 cm2. 1 ha = 10,000 m2. 1 are = 100 m2. 1 km2 = 1,000,000 m2. 5. Material calculation: Tiles/parquet: area + 5-10 % waste. Paint: about 100-150 ml/m2 per coat. Wallpaper: wall area = perimeter x room height minus windows/doors.
Calculation Example
L-shaped room: part 1: 5 x 4 = 20 m2. Part 2: 3 x 2.5 = 7.5 m2. Total area: 27.5 m2. Laminate with 8% waste: order 27.5 x 1.08 = 29.7 m2.
Sources
Official sources
Calculations are based on applicable German laws and official data:
Full methodology at Methodology.
Reviewed by Konstantin Iakovlev · Last updated:
Mathematics
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