In ZWCAD, quickly calculating the area of closed objects is a common task. Whether you need the area of a single object, the total area of multiple objects, or individual areas listed separately, there are multiple efficient methods.
This article organizes the process into clear categories based on your needs.
This method organizes multiple objects’ areas in a table, showing individual areas and total sum. Ideal for documentation, presentations, or printing.
1. In the Annotate tab, click Area Table (or type AREATABLE in the command line).
2. Customize the settings by selecting the dimension items to appear in the table (e.g., Name, Area). Choose whether to define custom names, adjust table style, display the total area etc. Once done, click OK.
3. Click an empty spot in the drawing to place the table.
4. Right-click and switch to Select Objects mode.
5. Select the objects to include and enter names if needed (skip this step if using auto names).
6. View the area values in the table. You may need to adjust the table size or scale to clearly see the numbers.
This is the quickest way to check the area of a single closed object. It’s simple and does not require running any commands, ideal for quick checks or small drawings.
Press Ctrl+1 to open the Properties panel, select the object(s) you want to measure, and view the area directly in the Properties panel.
Use this method when you need the combined area of multiple objects at once. It provides a fast method, suitable for efficiency in larger drawings.
1. Click Tools > Inquiry > Total Area (you can also type AREASUM in the command line).
2. Select the objects and press Enter when finished.
3. View the calculated area value in the command line.
This method converts objects into a hatch and calculates the area based on the hatch. It’s useful when working with complex shapes or when you want a visual representation of the area.
1. Type H in the command line and select Hatch. Select the objects to be hatched.
2. Press Ctrl+1 to open the Properties panel and view the hatch area, which is equal to the total area of the selected objects.
This method lists the area of each object separately, providing detailed information for each selection. Useful for precise analysis or reporting requirements.
1. Click Tools > Inquiry > List (or type LIST in the command line).
2. Select the objects and press Enter to finish the selection.
3. View the area values in the command line. Note: You may need to press Enter several times to display the data for all selected objects.
Ensure Objects Are Closed
Always confirm that the objects are fully closed before calculating area. Open polylines, gaps between boundaries, or incomplete shapes may still look correct visually, but they will either return no area or produce inaccurate results. This is especially important when working with imported drawings or edited geometry, where boundaries may appear closed but are technically broken.
Choose the Method Based on Your Purpose
Select the area calculation method based on how the results will be used. For quick visual checks or design validation, direct methods such as the Properties panel are usually sufficient. When area data needs to be reviewed, compared, shared, or reused later (for example, in material estimation or reporting), structured outputs like lists or area tables provide better clarity and traceability.
Verify Results Before Practical Use
Before applying area values to procurement, cost estimation, or quantity takeoff, double-check the drawing scale, units, and object selection. Small issues—such as incorrect units, mixed scales, or unintended extra objects—can lead to significant discrepancies when areas are summed or converted, especially in large or multi-drawing projects.
Document the Calculation Method and Settings
Always record the specific calculation method (e.g., direct query or area table) and key settings used; also record the drawing units (e.g., millimeters or meters), drawing scale, and any unit conversions applied. This step provides clear context for subsequent review, verification, or data reuse in other projects, effectively preventing misunderstandings or errors arising from ambiguous methods or units.
This usually happens if the objects are not fully closed. Open polylines, gaps in boundaries, or unconnected vertices prevent ZWCAD from correctly calculating the area.
To avoid this, ensure all objects are completely closed, and check for tiny gaps that might be hard to see. Using the Zoom or Object Snap tools can help identify such gaps before measuring.
Differences may result from unit settings, object scale, or UCS orientation. For accurate results, ensure the drawing’s units are correct, the UCS is properly aligned, and the objects lie on the correct plane. Additionally, check whether any scaling or transformation has been applied to objects, as this can also affect the calculated area. Verifying these factors before measurement helps prevent discrepancies.
ZWCAD stores area as a unitless geometric value. Tools like Properties, LIST, and Total Area only display the numeric result. Area Tables are annotation-based and follow the drawing’s unit and dimension settings, so they automatically display units such as mm².
ZWCAD uses unitless geometric values by default, meaning dimensions are stored as pure numbers without fixed units. You can simply add the required unit (such as mm) based on your drawing needs. If you prefer to define units at the system level, you can also modify them using the UNITS command.
Yes. When you create an Area Table in ZWCAD, the table can be exported and reused in external applications such as Excel for further calculation, review, or documentation. This is especially useful in scenarios like architectural design, quantity takeoff, or material procurement, where structured area data is required.
Calculating areas in ZWCAD can be performed quickly and accurately using various methods tailored to your needs, whether for single objects, multiple objects, or detailed listings. By choosing the appropriate method, verifying object closure, and checking scale and units, you can ensure reliable results. Structured outputs like lists or area tables enhance documentation, traceability, and efficiency in professional workflows.
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