Every pressure canner gets a score from 0 to 100% built from three factors, which maps onto the 5-point rating shown on the site (a 0% score would be 1.5 stars; a perfect score, 5). Each factor is scored against fixed reference points, not against the other products in the list, so adding a new model never moves another model’s rating. Canners are grouped by liquid capacity (under 16 quarts, 16 to 22 quarts, and 23 quarts and up) and use the same scale in every group.
| Factor | Measures | Weight |
|---|---|---|
| Value | price per quart of liquid capacity | 45% |
| Warranty | the maker's warranty on the canner | 25% |
| Convenience | automatic pressure control, a gasket-free seal and induction compatibility | 30% |
Where the numbers come from
Capacity, jar counts, weight, material and warranty come from the maker’s spec sheet, manual or product page: Presto’s spec sheets and warranty page, All American 1930’s product pages, Nesco’s user guide, Granite Ware’s instruction manuals and T-fal’s product page and manual. Prices are Amazon prices for a new item. Anything a maker doesn’t publish is left blank rather than taken from a retailer. Jar counts are the maker’s own, for regular-mouth jars; some count double-stacked jars, which the product page notes. Where a maker’s own pages disagree, as with All American’s two weights for each model, the product page figure is used and the page says so.
The factors
Value is the current price divided by the liquid capacity in quarts, on a log scale, so halving the price per quart always counts the same. $40 per quart scores zero and $5 per quart full marks. Capacity is used rather than jar count because every maker publishes it.
Warranty is the maker’s warranty on the canner itself: 1 year scores zero and 12 years full marks, and a lifetime warranty scores full marks. Presto’s 12 years excludes the gauge, sealing ring and other perishable parts. A canner with no published warranty scores zero and is marked estimated.
Convenience adds three points of upkeep and effort: automatic pressure control, as on an electric canner that holds temperature for you (half the score), a gasket-free metal-to-metal seal (a quarter) and induction compatibility stated by the maker (a quarter). A canner with a replaceable sealing ring, a gauge to watch and no induction claim scores zero here. A canner whose maker doesn’t state its seal is marked estimated.
What isn’t scored
Jar counts, material, weight, gauge type and glass-top advice are listed but not scored. Jar counts depend on jar shape and on double-stacking, so the makers’ numbers aren’t comparable one for one. A heavier canner isn’t better or worse. Pressure accuracy isn’t scored because no independent testing has been published for these models. All the canners ranked are sold for home pressure canning; the USDA does not certify or approve home canning equipment.
Missing data
If a figure isn’t published, that factor gets the neutral middle score (50) and the product page marks it as estimated. The exception is warranty: a maker that doesn’t publish one gets no warranty counted, so that factor scores zero and is marked estimated.
What isn’t ranked
Pressure cookers sold only for cooking, multicookers that aren’t approved for pressure canning, water-bath and steam canners, and parts and accessories aren’t ranked. Canners with no maker spec page or manual are held back until one turns up.
Ties and discontinued models
Products are ranked by score within each group. Discontinued models stay listed but rank below every current model and can be hidden with the “Hide discontinued” filter.