Compost Ratio Calculator
Enter two material amounts, choose compatible mass or volume units, and compare the resulting ratio with an optional target you set.
A QUICK WALKTHROUGH
How to use this tool
- Enter the amount for material A and material B using the same type of unit.
- Calculate the normalized A:B ratio.
- Optionally enter a target A:B ratio that you chose, then compare the result.
Use your own measurements
Name the materials however you like and enter the amounts you measured. Mass units can be compared with mass units, and volume units with volume units.
Targets are optional and user supplied
A target is only used when you enter it. The tool compares your measured ratio with that chosen target and does not claim that any ratio is agronomically correct.
GOOD TO KNOW
Common questions
Can I compare mass and volume?
No. Choose two mass units or two volume units; converting between mass and volume requires a material density that this calculator does not assume.
Does this recommend a compost recipe?
No. It calculates the relationship between your two entered amounts. Any target ratio is supplied and interpreted by you.
Are my amounts uploaded?
No. The calculation runs locally in your browser.