Planimeters are used most frequently in:
Agriculture, Aircraft Design, Architecture, Biology, Cartography, Chemistry, Civil Engineering, Cross-section Measurement, Development & Planning Commissions, Diagram Measurement, Engineering, Environment Control, Electro-plating, Estate Agents, Estimating, Flood Control, Forestry Management, Geology, Heating/Air Conditioning, Highway Planning, Hydraulic Engineering, Irrigation Engineering, Landscape Architecture, Land-use Analysis, Leather Industry, Legal, Local Councils, Map Making,
Mechanical Engineering, Medical Research, Military, Mining & Soil Engineering, Oil Industry, Physics, Pollution Control, Railways, Research Insitutes, Road Construction, Ship Building, Site Planning, Statistics, Technology, Textile Industry, Traffic Control Systems, Volume Calculation, Weight Calculation (Static)

Architecture and Planning:
Measurement of catchment areas for water supply, Measurement of populated areas to estimate changes in water requirements and waste water volumes for the planning of water supply and drainage, and traffic density for the planning of raod systems etc.

Agriculture and Forestry:
Measurement of areas of fields, woodland and scrub of estimating requirements for seed, fertilizer, pest control agents, stock possibilities, etc. can all be made more accurately.

Technology and Science:
In botany, leaf area can be of measured to determine the capacity of assimilitation during growth tests as well as the effectiveness of insecticides. Measurement of coloured bands in chromotography for analysis.

Medicine:
Calculating the size of organs by the measurement of radiographs, radiation tomographs or ultrasound pictures made at various levels.

Mechanical Engineering:
During the development, testing and inspection of heat engines, the indicator diagrams are evaluated with the aid of the planimeter and the performance and efficiency can be determined.

In metal and plastic engineering cross-sectional areas, including hollow bodies, are measured in order to calculate volumes and weights.

Structural & Civil Engineering:
Essentially the planimeter can only be used for measuring plane areas, but volumes can also be found quite simply with a little extra work. The areas within contour lines, or cross-sections, are plotted on a graph and the area under the graph is measured to give the volume.

„The planimeter as an integrator“
there is a detailed description in the instruction manual.