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Sod Area Waste Allowance and Roll Equivalents

Estimate sod area, fractional roll equivalents and area-priced material cost.

  • Formula & worked example
  • Private in your browser
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

A 10 × 5 m footprint plus 10 percent waste is 55 m². With 1 m² rolls, it is 55 roll equivalents; at $4/m² the modeled cost is $220.

A = length × width; total area = A(1 + waste_fraction); rolls = total area/roll area; cost = total area × price per area.

Worked example

Enter these known values and leave the other values blank.

Length
10 m
Width
5 m
Waste factor
10 %
Roll length
2 m
Roll width
0.5 m
Sod price per selected area
4 USD / m²
Total area
50 m²
Roll area
1 m²
Roll equivalents
55
Total cost
220 USD

Assumptions and limitations

  • The footprint and rolls are rectangular. Curved boundaries, trimming patterns and overlaps are represented only by the user-entered waste allowance.
  • Waste is displayed as percent and stored as a fraction. The default 10 percent is a planning value, not a measured requirement.
  • The price field is cost per square meter initially, not cost per roll. Total cost uses the continuous total area.
  • Roll count is a mathematical equivalent and can be fractional. Buying whole rolls requires rounding up and may change the actual invoice.

Common questions

Is the price per roll?

No. The price selector represents cost per area.

Why can the roll number be fractional?

Area is divided by roll area without integer rounding. Round purchases up if required.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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