Daily Biogas
64 cu ft
Cooking
6.4 hrs
Digester
482 gal
Savings/yr
$458
Daily Biogas Output
64 cu ft
38,250 BTU/day
Cooking
6.4 hrs
Electricity
3.2 kWh
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Price as of Jul 24, 2026. Product prices and availability are accurate as of the date indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Inputs
Result
Raw: 50 x 1.5 = 75 cu ft. Warm climate factor 0.85: 75 x 0.85 = 63.8 cu ft. Cooking: 64/10 = 6.4 hrs. Propane equivalent: 64 x 600 / 91,500 = 0.42 gal/day x 365 x $3 = $457.
Inputs
Result
Raw: 25 x 3.0 = 75 cu ft. Temperate factor 0.6: 75 x 0.6 = 45 cu ft. Cooking: 45/10 = 4.5 hrs.
Biogas yield depends on waste type: chicken manure produces ~2.5 cu ft per pound, pig manure ~2.0 cu ft/lb, cow manure ~1.5 cu ft/lb. A homestead producing 50 lbs/day of cow manure generates ~75 cu ft of biogas daily in warm climates, enough for 4–5 hours of cooking.
Digester size equals daily slurry volume times retention time. For 50 lbs/day of manure mixed 1:1 with water, the slurry is about 12 gallons/day. With a 40-day retention time (fixed dome), the digester needs 480 gallons (~64 cu ft). IBC tote digesters hold 275 gallons each.
| Digester Type | Retention Days | Cost per Cu Ft | Best For |
|---|---|---|---|
| Fixed Dome | 40 | $8 | Permanent installation |
| Floating Drum | 35 | $10 | Easy maintenance |
| Plug Flow | 30 | $5 | Large-scale farms |
| IBC Tote | 45 | $3 | DIY beginners |
Yes, 10 cu ft of biogas provides about 1 hour of cooking on a standard burner. A family producing 75–100 cu ft/day from a small digester can cook 7–10 hours daily, replacing 200–300 gallons of propane per year ($600–$900 savings at $3/gal).
Temperature dramatically impacts biogas output. Mesophilic bacteria work best at 95–105°F. In tropical climates (>77°F avg), digesters run at 100% efficiency. In temperate zones (50–65°F), output drops to ~60%. Cold climates (<50°F) see only 35% of potential output unless the digester is insulated or heated.
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Last Updated: Jul 24, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.