Organic Matter Estimate Calculator
Estimate loss-on-ignition percentage from dry and ashed sample weights.
A QUICK WALKTHROUGH
How to use this tool
- Estimate loss-on-ignition percentage from dry and ashed sample weights.
Formula and scope
LOI percent = (dry weight − ashed weight) ÷ dry weight × 100. Clay structural water and carbonates can affect the estimate.
Assumptions
Use consistent units and the same time period. Only entered values are included.
Local processing
Values stay in your browser. This is arithmetic, not professional advice.
GOOD TO KNOW
Common questions
Does this provide a recommendation?
No. It calculates only from your inputs.
Are inputs uploaded?
No. Processing stays local in your browser.