Compost Tea Brewer Calculator

Calculate compost tea brewing ratios, material quantities, coverage per brew, and seasonal application costs for actively aerated compost tea (AACT).

Brewer Capacity (gallons)

Compost Dilution Ratio (1:X)

Acres to Treat

Application Rate (gal/acre)

Brews Per Season

Compost Cost ($/cu ft)

Molasses (oz/gal water)

Molasses Cost ($/gallon)

Tab to move between fields

Compost Needed (cu ft)

0.74

Acres Per Brew

Water Needed (gallons)44.4

Molasses Needed (oz)44.4

Material Cost Per Brew$25.06

Season Cost Per Acre$15.04

Brews For Coverage2%

Cost Per Acre Per Application$5.01

How to Use This Calculator

Enter brewer volume (gallons or liters) and desired brew time (hours — typically 24-36 hours).
Enter compost input rate (% of volume) and aeration rate (CFM or LPM).
Read compost tea volume, microbial growth estimate, and application dilution ratio.
Verify dissolved oxygen (DO) stays above 6 mg/L throughout the brew for aerobic conditions.
Apply tea immediately after brewing — shelf life is less than 4 hours once aeration stops.

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