Worm Composting Bin Calculator
Worm Bin Sizing
Calculate bin size and worm count from food waste volume
Worm Population Growth
Estimate worm population growth over time
Formula
Worms (lbs) = Weekly Waste (lbs) x 2 | Bin Area (sq ft) = Weekly Waste (lbs) x 1 | Population doubles every 2-3 months
Frequently Asked Questions
How many worms do I need for composting?
A general rule is 2 lbs of red wiggler worms per 1 lb of food waste per week. For a typical household producing 4 lbs of food waste weekly, start with 2-4 lbs (2,000-4,000 worms). They will multiply to match the food supply.
What can I feed composting worms?
Feed them fruit/vegetable scraps, coffee grounds, tea bags, crushed eggshells, and small amounts of bread/grains. Avoid meat, dairy, oils, citrus, onions, and spicy foods. Cut waste into small pieces for faster processing.
How long does vermicomposting take?
Worms can process food waste in 2-3 months under good conditions. A new bin typically produces harvestable compost (castings) in 3-6 months. The worm population will double every 2-3 months if well cared for.
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