Canning Headspace & Processing Calculator

Safe home preservation starts here. Enter your altitude and select your food style to determine safe processing times for water bath or pressure canning, alongside required jar headspace.

Canning & Altitude Calculator

Safe canning headspace and times

Food Category

Altitude (feet)

Canning Requirements

Headspace:1/4 inch (6 mm)

Method:Water Bath

Processing Time:10 minutes

Frequently Asked Questions

At higher elevations, the boiling point of water is lower. To achieve bacterial sterilization, processing times in water bath canners must be lengthened.

Headspace is the empty space at the top of the jar. Too little headspace can cause food to expand and spill, preventing a proper seal. Too much headspace results in air remaining in the jar, leading to oxidation.

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