🫙 Canning Batch Calculator
Pounds of produce needed for any number of jars
About this calculator
The Canning Batch Calculator scales preserving recipes safely. Enter the original recipe quantities and your jar count or batch size; it scales ingredients proportionally and estimates processing time, headspace, and total yield. It also tracks acid and salt ratios that must stay exact for safe canning, warning you before a scaled batch drifts out of tested proportions.
Tip: never scale processing time or headspace by feel — only scale ingredient amounts, and follow tested recipes for times, because botulism does not care about your intuition.