The Volume and Surface Area of a Greenhouse (gabled roof) calculator computes the interior volume (V) and Surface Area (SA) of a greenhouse based on simple measurements. .png)
INSTRUCTIONS: Choose units and enter the following:
- (W) Width of Greenhouse (under the gable)
- (L) Length of Greenhouse (perpendicular to gable).
- (H1) Height of Main Area
- (H2) Height of Gable
Greenhouse Volume (V) and Surface Area (SA): The volume is returned in cubic feet, and the surface area in square feet However, these can be automatically converted to compatible units via the pull-down menu.
The Math / Science
The interior volume of a greenhouse formula is:
`V = (0.5*W*H2 + H1*W)*L`
where:
- V = Volume of the Greenhouse
- W = Width
- L = Length
- H1 = Height below trusses or rafters
- H2 = Height of gable
This is a simple computation using the lateral area of the green house defined by the rectangle of (H1*W) and triangle (.5 * W *H2) all 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. Note: The formula above is accurate whether the greenhouse has even gables (isosceles triangle) or uneven gables as in the second diagram. Both gable areas are triangles with a surface area of base times height. In the latter case, the base is the sum of the two widths (W = W1 + W2)
The surface area is the sum of the sides and roof. The formula for the surface area is:
`SA = 2*H1*W + H2*W + 2*L*H1 + sqrt((w/2)^2 + H_2^2) * L * 2`
where:
- SA = Surface Area of Greenhouse
- H1 = Rectangular Height of main area
- H2 = Height above main area
- W = Width of Greenhouse
- L = Length of Greenhouse
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.
The Greenhouse Calculator provides useful equations and data for people who work with greenhouses and high-tunnels. This includes basics for greenhouse construction and heating, for mulching and coverage with straw and for greenhouse planters.
A greenhouse, aka a glasshouse or a hothouse, is a building or complex in which plants are grown. A miniature greenhouse is known as a cold frame. Related to a greenhouse is a high-tunnel which is a greenhouse build over soil directly.
Greenhouse structures range in size from small sheds to industrial-sized buildings with different types of covering materials, such as a glass or plastic roof and frequently glass or plastic walls. 
A Greenhouse is designed to warm as incoming sunshine is absorbed inside the structure. Air warmed by the heat from warmed interior surfaces is retained in the building by the roof and walls. By using non-porous materials such as glass or plastic, the air that is warmed near the ground is prevented from rising indefinitely and flowing away.
Commercial glass greenhouses are often high-tech production facilities for vegetables or flowers. The glass greenhouses are filled with equipment like screening installations, heating, cooling, lighting and airflow systems and also may be automatically controlled by a computer to maximize potential growth.
vCalc's Greenhouse category (tag) contains equations and calculators pertaining to greenhouse calculations, metrics and other data.
Greenhouse and High-tunnel Calculators
- Volume of a Gabled Greenhouse: Enter the dimensions of a gabled building and compute the cubic feet volume.
- Volume of a Curved Dome 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 a Curved Dome 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.
- Bell-shaped Greenhouse Volume and Surface Area: Computes volume, surface area, floor space and height based on dimensions.
- Greenhouse 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.