Compost and Mulch
Compost Moisture Content Calculator
This worksheet addresses one practical question: calculate wet-basis moisture content from a dried sample. Its formula and assumptions remain visible with the result.
Enter values for moisture content
Water mass lost on drying and the other Compost Moisture Content fields share one scenario.
Measurements for Compost Moisture Content
For moisture content, collect Water mass lost on drying and Wet sample mass on the Compost Moisture Content basis. Compare this result with Compost Pile Mass Calculator when estimated pile mass is also needed.
Water mass lost on drying. Default in Compost Moisture Content: 420 g.
Wet sample mass. Default in Compost Moisture Content: 1,000 g.
From water mass lost on drying to moisture content
Compost Moisture Content compares Water mass lost on drying and Wet sample mass and reports the relationship as a percentage.
Water mass lost on drying at 420 g, wet sample mass at 1,000 g produces 42.00% in the demonstration case.
Moisture content: interpretation
Read Moisture content as the answer to “Calculate wet-basis moisture content from a dried sample.” Keep the Compost Moisture Content units attached.
Compost Moisture Content assumption to check
Dry to a consistent endpoint before weighing.
A zero Wet sample mass leaves moisture content undefined in Compost Moisture Content.
Scope of this moisture content calculation
The planning question for Compost Moisture Content is whether you can calculate wet-basis moisture content from a dried sample. Compost Moisture Content measures this portion as Moisture content.
Record adjustments outside Moisture content separately. Use the Compost Turning Interval tool when average turning interval needs its own calculation.
After calculating moisture content
Store the Compost Moisture Content date, Water mass lost on drying and Wet sample mass, and Moisture content.
Separate measured water mass lost on drying from an assumed value so a later user can reconstruct the case.
Add the garden outcome as a new entry, using the same units and definition as moisture content.
Water mass lost on drying: sensitivity example
Create a second case by setting Water mass lost on drying to 462 g. The initial setting is 420 g, and the corresponding moisture content values are 42.00% and 46.20%.
This keeps the effect of water mass lost on drying distinct from changes in the other Compost Moisture Content inputs.
Do not replace the source measurement merely because one scenario gives a preferred answer.