Acreage Sample Ring

The Acreage Sample Ring calculator computes the radius of an area sample ring..

INSTRUCTIONS: Choose units and enter the following:

• (A) Sample Area

Acreage Sample Ring (r): The calculator returns the radius of a ring (circle) in feet.  However, this can be automatically converted to compatible units via the pull-down menu.

The Math / Science

It is often useful to find a sample area that is based on a circle.  The Acreage Sample Ring calculator computes the radius of a circle where the circle is equal to the area input.

The formula for an Acreage Sample Ring is:

`r = sqrt(A/pi)`

where:

• r = radius of the circle
• A = area

Practical Example

In forestry, one may want to count the number of trees in an area, say 150 acres.  But a reasonable estimate might be to count the trees within a 1/10th and acre and then multiply that number by 1500 to estimate the number of trees.  One can use this formula to compute the radius of a 1/10th acre ring, and count the trees within that circle.

Forestry Calculators

• Tree Basal Area from Diameter: Computes the basal area of a tree based on the measurement of the tree's diameter at breast height.
• Tree Basal Area from Circumference: Computes the basal area of a tree based on the measurement of the tree's circumference at breast height.
• Basal Area per Acre: Computes the basal average per acre (ft²/ac) and basal average per hectare (m²/ha), based on samples and plot size.
• Volume of Maple Syrup from Sap: Computes the amount of maple syrup produced from an amount of sugar maple sap.
• Value of Maple Syrup Harvest: Computes the dollar amount associated with a number of sugar maple tree taps.
• Acreage Sample Ring: Compute the radius of a circle (e.g., 37 ft) where the area of the circle equates to an input area (e.g., 1/10^th acre)
• Square Meters to Acres: Converts square meters to acres.
• Simple Stats: Computes the most common observational statistics (min, max, mean, sd, sum, sort etc) for a set of comma separated numbers.