When comparing flats, the total monthly rent alone can be misleading. A smaller flat may cost less overall but have a higher price per square metre. Calculating rent per square metre provides a more consistent starting point.
Formula for rent per square metre
Monthly rent per m² = monthly net cold rent ÷ floor area. If the net cold rent is €820 and the floor area is 82 m², the result is €10 per square metre. Keep service charges and heating costs separate so that you do not compare cold rent with warm rent.
Use the rent per square metre calculator to compare listings. The area calculator can help check floor-area figures, while the rental deposit calculator estimates the security deposit for moving in.
What affects a fair comparison?
- Location, building age, condition and features
- Floor area and the method used to measure it
- Balcony, fitted kitchen, parking and other extras
- The difference between net cold rent, service charges and heating costs
Use a local rent index as a reference
A simple or qualified local rent index can provide information about comparable rents. Section 558c of the German Civil Code describes a rent index as an overview of local comparative rents for a municipality or part of it. See the official German provision on rent indexes, and check the current index published for your city. Compare properties with similar features.
Look beyond one number
A lower price per square metre does not automatically make a flat the better choice. Consider commuting time, energy efficiency, condition, service charges and planned renovation. Use the calculator as a first comparison and review the lease and cost breakdown carefully.
This calculator does not assess whether a rent is legally permissible. Local rent rules and indexes depend on the location and circumstances.
Compare flats on a like-for-like basis
For an initial comparison, use the net cold rent and the same floor-area definition. Then check location, condition, energy efficiency, balcony, fitted kitchen and included service charges. A lower price per square metre is not automatically the better deal if extra costs or major renovation work are involved.
What is a German rent index?
A Mietspiegel records local comparative rents using factors such as location, size, facilities and building age. Your municipality can tell you whether a qualified rent index is available and how to use it.