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Calcimator

Composting Facility Sizing Calculator

Size windrow or vessel composting facilities from feedstock volume, type, and processing method.

Inputs

cubic yards/week
times/week
weeks

Results

Required Pad Area

1.58 acres

≈ 15 basketball courts

Number of Windrows/Piles

14

Volume in System at Once3,200 cubic yards
Annual Throughput4,160 tons
Annual Finished Compost2,080 tons
Total Process Time16 weeks
Estimated Capital Cost$62,400.00
Annual Operating Cost$104,000.00
Annual Compost Revenue$156,000.00
Equipment NeededWindrow Turner
Turning2
How to Use This Calculator
  1. Enter Weekly Feedstock Volume (cubic yards/week) — the amount of organic material arriving at the facility each week.
  2. Select Feedstock Type (food scraps, yard waste, mixed organics) and Composting Method (windrow, aerated static pile, in-vessel).
  3. Set Turning Frequency (times/week) and Curing Time (weeks) to match your composting protocol and quality targets.
  4. Review Required Pad Area (acres) and Number of Windrows/Piles to determine land and equipment requirements.
  5. Check Annual Throughput (tons) and Annual Finished Compost output to evaluate revenue potential from finished product sales.

What each input means

Weekly Feedstock Volume
Average weekly volume of incoming organic feedstock.
Feedstock Type
1 = Yard Waste, 2 = Food Waste, 3 = Mixed Organics.
Composting Method
1 = Windrow, 2 = Aerated Static Pile, 3 = In-Vessel.
Turning Frequency
For windrow composting: number of times windrows are turned per week.
Curing Time
Weeks of curing after active composting before product is ready.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Weekly Feedstock Volume = 200, Feedstock Type = 3, Composting Method = 1, Turning Frequency = 2 = 5 input(s) provided
  2. Calculate Required Pad Area
    Required Pad Area
    1.58 = 1.58
  3. Calculate Number of Windrows/Piles
    Number of Windrows/Piles
    14 = 14
  4. Calculate Volume in System at Once
    Volume in System at Once
    3200 = 3200
  5. Calculate Annual Throughput
    Annual Throughput
    4160 = 4160

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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