Know exactly how many jars to fill before you start cooking.
Pick a recipe, enter your produce weight, and get jar counts, ingredient amounts, and processing times in seconds. Built for home canners who hate guessing.
Batch Setup
Batch Results
Enter your produce weight and pick a recipe to see results here.
Saved Batches
Stored in your browser. Cleared when you delete browser data.
How This Works
Each recipe preset has a tested yield ratio. That ratio tells you how many pounds of raw produce fill one pint jar on average. The calculator multiplies that ratio by your produce weight and the jar size you pick. It then scales every ingredient in the recipe to match.
Processing times come from the USDA Complete Guide to Home Canning and the National Center for Home Food Preservation. If you live above sea level, the tool adds the recommended extra minutes automatically.
Headspace matters. Too much and the jar may not seal. Too little and food can leak out during processing. The notes section tells you the right headspace for each recipe type.
Common Mistakes
- Guessing jar counts. A bushel of tomatoes does not always fill the same number of jars. Variety, ripeness, and how you trim them all change the yield.
- Changing acid levels. In pickle and tomato recipes, the vinegar-to-water ratio keeps the pH safe. Scaling the produce is fine. Changing the brine is not.
- Forgetting altitude. Water boils at a lower temperature at higher elevations. If you skip the extra processing time, the food may not be safe.
- Reusing old lids. Flat lids are one-time use. Rings can be reused if they are not rusty or bent.
Quick Reference: Yield by Produce
| Produce | Pounds per Pint Jar (approx.) |
|---|---|
| Apples (for sauce) | 1.5 – 2.0 |
| Tomatoes (whole) | 2.5 – 3.0 |
| Cucumbers (pickles) | 1.5 – 2.0 |
| Strawberries (jam) | 0.75 – 1.0 |
| Pears (halved) | 1.5 – 2.0 |
| Green beans | 1.0 – 1.5 |
| Peaches (halved) | 2.0 – 2.5 |
These are rough ranges. Your actual yield depends on the variety and how you prep the produce.
Frequently Asked Questions
- What if I have leftover produce after filling jars?
- Use it fresh, freeze it, or make a half-batch. The calculator rounds up so you should have enough jars. If you still have extra, that is a good problem to have.
- Can I double a recipe?
- Yes, for most water bath recipes. Enter the doubled produce weight and the ingredient amounts scale up. Do not double recipes that rely on precise ratios like jams with pectin. Make two separate batches instead.
- Why does my jam set differently each time?
- Fruit ripeness, sugar content, and cooking time all affect the set. The calculator gives you ingredient amounts. The final cook time depends on your stove and pot. Use the sheeting test or a thermometer for best results.
- Do I need to sterilize jars?
- If the processing time is 10 minutes or more, the jars get sterilized during processing. For shorter times, boil the jars for 10 minutes first or run them through a dishwasher sanitize cycle.