Deep Litter & Backyard Poultry Compost Calculator
Calculates annual manure production, carbon bedding needed to balance C:N ratios, and finished compost volume.
Figures reviewed against university extension guidance · Last reviewed August 2026
- Annual Manure Yield
- 986 lbs
- 2.7 lbs / day (16.4 cu ft)
- Carbon Bedding Needed
- 2 bags
- ~49 lbs dry carbon
- Finished Compost Yield
- 0.39 cu yards
- Organic garden fertilizer
- Garden Curing Time
- 90 days
- Hot compost (or 180 days aging)
Manure output & carbon bedding for 10 chickens
A flock of 10 adult chickens produces 986 lbs of fresh manure per year (2.7 lbs daily). Balancing high-nitrogen manure with pine shavings requires 2 bags of carbon bedding per year, yielding 0.39 cu. yards of organic garden compost.
How the poultry compost calculation works
Penn State Extension publishes laying hen manure generation rates at ~0.27 lbs per bird daily (~100 lbs/year). Poultry manure is high in nitrogen with a Carbon-to-Nitrogen (C:N) ratio of ~10:1. Ideal composting requires a C:N ratio of 25:1 to 30:1.
The calculator computes the carbon bedding mass needed to bring high-nitrogen manure to a balanced 25:1 ratio using pine shavings (500:1 C:N), straw (80:1), or dry leaves (60:1).
A worked example
For 20 chickens, annual manure output totals ~1,970 lbs. Adding ~30 cu. ft. of pine shavings produces ~1.5 cubic yards of rich, balanced garden compost after 90 days of hot composting.
Sources
- Penn State Extension — Poultry Manure Production and Classification
- USDA NRCS — Composting Household & Animal Waste
Frequently asked questions
- Why is raw chicken manure dangerous to use directly on plants?
- Raw chicken manure is extremely high in nitrogen and ammonia (C:N ratio ~10:1). Applying uncomposted manure to plants will "burn" plant roots, dehydrate vegetation, and carry potential pathogens like Salmonella or E. coli.
- What carbon bedding is best for chicken manure composting?
- Pine wood shavings (C:N ratio ~500:1) and dry straw (C:N ~80:1) are ideal. Mixing high-carbon bedding with nitrogen-rich manure balances the compost heap to the target 25:1 to 30:1 C:N ratio needed for fast decomposition.
- How long must chicken manure compost before applying to vegetable gardens?
- Hot active composting (internal pile temperatures reaching 135°F–160°F) requires 90 days of curing. Cold or passive deep-litter aging requires 6 months (180 days) before safe application around edible vegetable crops (USDA Organic standards require 120 days for crops in contact with soil).
- How much manure does one chicken produce in a year?
- One standard laying hen produces approximately 0.27 lbs of fresh manure daily, which equals about 95 to 100 lbs of manure per year (~1.6 cubic feet of raw manure).
- What is the deep litter method in a chicken coop?
- The deep litter method involves continuously adding fresh carbon bedding (pine shavings or dry straw) over chicken droppings inside the coop. Microorganisms slowly break down the manure inside the coop floor over months, generating gentle heat in winter and producing rich compost.