Canning Jar Calculator

Find how many jars a batch of preserves will fill at a given jar size.

Usage Tip

Have an extra clean jar ready in case your yield runs slightly over.

Jars Needed
jars
For the batch
THE MATH
jars = round up( total product ÷ jar size )
Round up – the last jar may not be completely full.
Leave the headspace your recipe specifies; do not overfill jars for canning.
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.