Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Fixed-area plot, circular stem sections and consistently defined breast-height measurements. No timber-volume or carbon-stock inference.
Example Calculation
- Tree diameters at breast height (cm): 20,30,40
- Sample plot area: 0.1 ha
Diameters 20,30,40 cm total about 0.227765 m² basal area; on 0.1 ha this is 2.27765 m²/ha.
Frequently asked questions
How do I use this calculator?
Enter tree diameters at breast height (cm), sample plot area. The result updates automatically. Use Reset to restore the example values.
What method does it use?
tree basal area=π(diameter meters)²/4; stand basal area=sum/plot hectares.. Fixed-area plot, circular stem sections and consistently defined breast-height measurements. No timber-volume or carbon-stock inference.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.