Free calculator

Jar capacity calculator

Estimate how many jars you need while preserving practical headspace.

How the estimate works

This calculator uses a conservative working capacity instead of filling jars to the lid. Actual density varies, so buy at least one extra jar and avoid compressing material simply to reduce jar count.

Humidity packs should be sized to the container and amount stored according to the pack manufacturer. Passive humidity control is not a substitute for monitoring.