Mulch to cover irregular area

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The Mulch Needed for an Irregular Area calculators computes the number /attachments/57c5ae5a-eeda-11e6-9770-bc764e2038f2/quadrilateral.png AREA COVERED of regular 2 ft³ bags of wood-chip mulch needed to cover an area such as a field, garden or planter.

INSTRUCTIONS: Choose your length units and enter the following:

(a) Length of side a
(b) Length of side b
(c) Length of side c
(d) Length of side d
(D) Length of the diagonal (see diagram).
(DP) The desired depth of mulch.

Mulch Needed for an Irregular Area(M): The calculator returns the number of standard bags of mulch, the volume of mulch in cubic yards and the area of the garden in square feet. However, these can be automatically converted to compatible units via the pull-down menu.

The Math / Science

The calculator computes the area of the quadrilateral defined by the length of the four sides and the diagonal. It then computes the volume by multiplying the area by the depth of mulch. It then computes the number of bags by dividing the volume by the volume in a standard size bag.

Mulching Calculators

Mulch to Cover Area: Enter an area size (e.g. 45 square feet or 0.75 acres) and depth of mulch wanted, and see estimated amount of mulch needed.
Mulch to Cover Circular Area: Enter the diameter (D) of the circle and depth of mulch wanted, and see estimated amount of mulch needed.
Mulch to Cover Rectangular Area: Enter the length (L) and width (W) of the area and depth of mulch wanted, and see estimated amount of mulch needed.
Mulch to Cover Irregular Area: Enter the length of the four sides (a,b,c,d) and the diagonal (D) of an irregular area (see diagram) and the depth of mulch wanted, and see estimated amount of mulch needed.
Mulch Cost Estimate: Enter the amount of mulch needed, choose a type of mulch and it will provide an estimate of the cost.
Mulching With Straw (Irregular Area): Enter the length (L) and width (W) of the rectangular area and it will estimate the number of bales of straw needed to mulch the area with straw.
Mulching With Straw (Area): Enter the area (acres, square feet) to see an estimate of the number of bales of straw needed to mulch the area with straw.
Bulk vs Bag Price Comparison: Enter the bulk mulch and bag prices and volumes, and it tells you which is cheaper and by how much.
Landscape Fabric: Computes the amount of landscape fabric needed for an area.

Mulching Information

Mulching is an excellent way to help your garden, plants, shrubs or trees in your yard. Mulch slows the growth of weeds, while allowing water and air to get to your plants; it also provides a pleasing visual boundary to highlight your plants.

To help you know how much mulch you need for a job, the vCalc mulch calculator helps calculate the volume of mulch needed. The volume equations, mulch cover (area), mulch cover (circular) and mulch cover (rectangle) both use the dimensions of the area to be covered and the desired depth of mulch in order to calculate the volume. The volume is returned in cubic units (system units such as cubic feet) or in standard bags. Bags of mulch in the U.S. typically come in units of 2 cubic feet. Note: most experts recommend a depth(d) of 1" to 2" of fine mulch or 3" to 4" of coarse mulch.

The mulch cost equation allows you to enter the cubic measurement (ft³ or m³) and then lets you enter the unit price for a cubic foot of mulch. vCalc uses the volume and unit price to compute the total cost. Local pricing should always be used. However, for the convenience of the user, a periodic Internet survey is made of mulch prices. The most recent observations are as follows:

Date: 12/27/21
Store: Lowes
- Red Mulch: 1.84 USD/ft³
- Pine Mulch: 2.44 USD/ft³
- Common Hardwood Mulch: 1.84 USD/ft³
- Cedar Mulch: 1.83 USD/ft³
- Rubber Mulch: 8.725 USD/ft³

The Math / Science

Mulching Calculators

Mulching Information

See Also