DEDUCTIONS AND EXISTING STOCK

Mulch top-up orders — existing effective depth scenarios.

How does changing existing effective depth affect mulch top-up orders when the other inputs stay fixed?

What this decision changes

A known internal space, existing stock or shared quantity must enter the correct subtraction or eligibility step rather than being counted as new material. Method basis: Each bed can have a different existing layer. A bed already at or above your chosen target needs no top-up. Depths are inputs, not gardening recommendations. Optional prices compare whole bags with bulk volume rounded to your supplier increment and a single delivery charge. A price of zero leaves that quote unpriced; it is not treated as free material.

The focus is existing effective depth in the first repeated measured entry. Other repeated entries keep their own supplied values.

New volume = Σ(area × max(0, target depth − existing depth))Mulch Calculator

Evaluate your supplied alternatives

Start with your measured plan and selected product data. The initial values and range are illustrative. Each scenario changes only existing effective depth in the first repeated entry; the other entered values stay fixed.

Display units

Measured plan and product inputs

Volume printed on a mulch bag

L/bag

Waste allowance

Shortcuts only; choose your own allowance above.

Where to get this value

Enter your own allowance. Presets are input shortcuts, not a construction recommendation.

Price per bag

USD

Bulk material price

USD/m³

Price per displayed volume unit. Enter 0 if this quote is unavailable.

Bulk delivery charge

USD

Supplier bulk order increment

m³

Mulch bed 1 · entry varied by the range

Length

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Width

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Your target total depth

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Existing effective depth

Where to get this value

Measure only the area, length or quantity to deduct, in the unit shown. Keep this consistent with the surface being calculated.

Supplied comparison range for existing effective depth

Lower supplied comparison value

Where to get this value

Measure only the area, length or quantity to deduct, in the unit shown. Keep this consistent with the surface being calculated.

Upper supplied comparison value

Where to get this value

Measure only the area, length or quantity to deduct, in the unit shown. Keep this consistent with the surface being calculated.

Nine evenly spaced values are evaluated. Whole counts are rounded to distinct integer scenarios. Values between the listed samples are not calculated.

9 evaluated scenarios

Baseline: Mulch bags to purchase — 9 bags. Rejected combinations remain visible below.

Quantity to plot

Each bar is one actual calculated mulch bags to purchase. Horizontal values: existing effective depth in mm. Only the first repeated entry varies.

Existing effective depth	Mulch bags to purchase	Change from baseline	Use this scenario
15 mm	11 bags	2 bags	Open in calculator Exact quantity breakdown Bed area 8 m² New mulch volume 0.48 m³ Order volume 0.528 m³ Bulk order after supplier rounding 0.528 m³
18.125 mm	11 bags	2 bags	Open in calculator Exact quantity breakdown Bed area 8 m² New mulch volume 0.455 m³ Order volume 0.5005 m³ Bulk order after supplier rounding 0.5005 m³
21.25 mm	10 bags	1 bag	Open in calculator Exact quantity breakdown Bed area 8 m² New mulch volume 0.43 m³ Order volume 0.473 m³ Bulk order after supplier rounding 0.473 m³
24.375 mm	9 bags	0 bags	Open in calculator Exact quantity breakdown Bed area 8 m² New mulch volume 0.405 m³ Order volume 0.4455 m³ Bulk order after supplier rounding 0.4455 m³
27.5 mm	9 bags	0 bags	Open in calculator Exact quantity breakdown Bed area 8 m² New mulch volume 0.38 m³ Order volume 0.418 m³ Bulk order after supplier rounding 0.418 m³
30.625 mm	8 bags	-1 bag	Open in calculator Exact quantity breakdown Bed area 8 m² New mulch volume 0.355 m³ Order volume 0.3905 m³ Bulk order after supplier rounding 0.3905 m³
33.75 mm	8 bags	-1 bag	Open in calculator Exact quantity breakdown Bed area 8 m² New mulch volume 0.33 m³ Order volume 0.363 m³ Bulk order after supplier rounding 0.363 m³
36.875 mm	7 bags	-2 bags	Open in calculator Exact quantity breakdown Bed area 8 m² New mulch volume 0.305 m³ Order volume 0.3355 m³ Bulk order after supplier rounding 0.3355 m³
40 mm	7 bags	-2 bags	Open in calculator Exact quantity breakdown Bed area 8 m² New mulch volume 0.28 m³ Order volume 0.308 m³ Bulk order after supplier rounding 0.308 m³

Read the evaluated results

Watch the net requirement and actual order separately. Invalid rows identify combinations that cannot satisfy the method's geometric or stock-basis constraints.

Replace every illustrative baseline measurement and selected product value with the inputs for your actual task.
Enter a comparison range on the focused input's stated unit and quantity basis.
Review rejected combinations and use the exact detail lines to distinguish measured demand from whole purchases.
Open an evaluated scenario in the full calculator to save its original inputs and quantity breakdown to a browser material project.

Keep the comparison within scope

The supplied cavity, exclusion or stock eligibility must already be valid; the result does not select a safe shell, opening or construction detail.

Uses supplied geometry, product properties and purchasing specifications.

Does not choose or certify construction dimensions, spacing, loads or regulatory requirements.

Only the listed samples are evaluated. Intermediate values, alternate constraints and global cutting optimality are not inferred from the graph.

Continue with this quantity method

Mulch Calculator

Other independent input decisions

Prepare the actual material data

Read the measurement and purchase guides

Calculate mulch top-up from the existing layer

Quantity method and illustrative scenarios checked 6 October 2026. Methods and scope.