The Greenhouse Volume equation (Quonset shaped) calculates the interior volume and surface area of a greenhouse based on simple measurements. 
INSTRUCTIONS: Choose units and enter the following:
- (L) Length of the greenhouse
- (H) Height of the greenhouse
- (W) Width of the greenhouse
Quonset Hut Volume (V): The calculator returns the following:
- (V) Volume of Quonset Hut in cubic feet
- (SA) Surface area in square feet
- (FS) Floor space in square feet
- (AL) Roof Arc Length in feet
However, these can be automatically converted to compatible units via the pull-down menu.
The Math / Science
The volume calculation is a simple computation using the lateral area of the green house defined by the area of the semi-ellipse of dimensions height (H) and width (W) times the (L) the length. The default input units are feet, and the calculator returns cubic feet. However, vCalc lets the user can choose one of many length and volume units for automatic conversion from the pull-down list for both the input length units and the output volume units.
USES
The volume of a greenhouse is useful in many ways. It is most often needed for calculating the heating and moisture (humidity) needs of the greenhouse.
Greenhouse or High-tunnel Calculators
- Volume of a Gabled Greenhouse: Enter the dimensions of a gabled building and compute the cubic feet volume.
- Volume of an Arched Roofed Greenhouse: Enter the dimensions of an arched roofed building (see diagram) and compute the cubic feet volume.
- Volume of a Quonset Hut Greenhouse: Enter the dimensions of the Quonset Hut and compute the cubic feet volume.
- Surface Area of a Gabled Greenhouse: Enter the dimensions of a normal gabled building and compute the square feet surface area.
- Surface Area of an Arched Roof Greenhouse: Enter the dimensions of an arched roof building and compute the square feet surface area.
- Surface Area of a Quonset Hut Greenhouse: Enter the dimensions of a Quonset Hut and compute the square feet surface area.
- Green House Air Flow: Computes the air flow volume at the fan, middle and end of the greenhouse and the Evaporative Cooling Efficiency
- Conductive Heat Loss: Enter the surface area, the heat loss coefficient for the surface material and the maximum heat range, and the calculator will compute the BTUs per hour needed to heat the inside.