Kitchen Tools

Canning Batch Calculator

Enter what you're canning and how much you've got — get an estimated jar count, plus how much to add to your recipe's water-bath time for your altitude.

Estimates only — always process to a tested recipe's base time · Pairs with the Compost Calculator

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Most of coastal and southern New England is under 1,000 ft. Not sure? A quick web search of "[your town] elevation" will tell you.

Quart Jars
0
Pint Jars
0
Add This to Your Recipe's Base Water-Bath Time
+0 minutes
This adjustment is for boiling water-bath canning only (high-acid foods like tomatoes, fruit, pickles, and jam). Low-acid vegetables and any meat require pressure canning with different, altitude-specific pressure adjustments — always use a current, tested recipe from the USDA or National Center for Home Food Preservation for exact base processing times and pressure settings. This calculator estimates yield and a time adjustment; it isn't a substitute for a tested recipe.

A Few Notes Before You Start

These yields are estimates, not guarantees. How much juice or sauce you actually get depends on ripeness, variety, and how much you're reducing liquid, so treat the jar count as a planning number, not a precise promise.

Altitude matters because water boils at a lower temperature as you go up. At sea level, water boils at 212°F; by 5,000 feet, it's closer to 203°F. Since a boiling water bath can never get hotter than boiling, lower boiling points mean less heat penetrating the jar, so processing has to run longer to reach the same safety margin.

When in doubt, round up on jars and time. Buying one extra jar you don't end up needing costs nothing; running short mid-batch means scrambling. Same logic applies to processing time; there's no real downside to a few extra minutes in the water bath, but under-processing is a genuine food safety risk.

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Compost Calculator →
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