Room and Plot Area Calculator
Rectangle = length × width; triangle = base × height / 2; circle = πr².
Inputs and units
Choose the shape before entering dimensions. Keep every length in the same unit; the answer is in that unit squared. Split irregular plans into simple nonoverlapping shapes.
Calculation method
Rectangle = length × width; triangle = base × height / 2; circle = πr².
Worked example
The example values are: Shape = rectangle; Length / base / radius = 5; Width / perpendicular height (unused for circle) = 4; Dimension unit = m
- Square metres: 20
- Square feet: 215.278208334
- Hectares: 0.002
Assumptions and limitations
Check that the inputs and units describe your situation.
Using your result
Calculate after editing the inputs. Copy result saves the displayed values; Download result saves text, and Download CSV creates a spreadsheet-friendly report. Use Print report for a paper copy. Include inputs in copied links only when you want to share them.
Room and Plot Area Calculator FAQs
Can I use feet instead of metres?
Yes, if all lengths use feet the answer is square feet. Do not mix feet and metres within one calculation.