Can You Use a Pressure Cooker as a Pressure Canner? (2026)

The answer in one line, and the argument behind it

Home canners argue about this constantly, and the argument is worth watching because all three common positions are partly right. One camp says the two machines are simply different things:

"A pressure cooker and a pressure canner are totally different devices." - u/bigalreads

Another points out that this is not mechanically true:

"Well, no, they're not. Pressure canners are quite literally just big pressure cookers that sometimes come with some extra accessories." - u/PraxicalExperience

They are both correct, and neither is useful yet. The cleanest statement of it we found belongs to a third commenter:

"All pressure canners are also pressure cookers But not all pressure cookers are safe to pressure can with." - u/gpuyy

That is the rule, and USDA agrees with it in substance. Its own glossary defines a pressure canner by function, not by badge: a kettle with a lockable lid, jar racks, one or more safety devices, a system for exhausting air, and a way to measure or control pressure. Meet that description at sufficient size and you have a canner. Miss part of it and the label on the lid will not save you.

What actually makes a pot a canner

There is a hard size floor, and it is lower than most people expect. The National Center for Home Food Preservation states it plainly: to be considered a pressure canner for USDA processes, the canner must be able to hold at least four quart-size jars, standing upright on the canner rack, with the lid in place. The USDA glossary says the same thing from the other direction, calling four quart jars the minimum volume and adding that use of pressure saucepans with smaller capacities is not recommended.

So three things have to be true at once:

• It holds at least four quart jars standing upright on a rack, with the lid closed and locked. Not four jars on their sides, and not four pints.
• It can be vented. Canning processes begin with ten minutes of exhausting air, because trapped air lowers the temperature you get at a given pressure.
• It can show you that it stayed at pressure for the entire process, through a weighted regulator that rocks or jiggles, or a dial gauge you have had tested.

Four quart jars is the general floor, not a universal permission. Individual USDA processes can demand much more: the smoked fish process specifies a 16 to 22 quart canner and tells you directly not to use smaller pressure saucepans. Check the recipe you actually intend to run.

The reason the internet gives you is not the published reason

Search this question and you will be told a pressure cooker cannot reach the temperature that kills botulism spores. We could not find that claim in any USDA, NCHFP or extension source, and the physics does not support it as a blanket statement either. One commenter put the relationship more precisely than most articles manage:

"The pressure and temperature inside a sealed vessel are directly related. If you can control one, the other is also controlled." - u/digital0129

That is right as far as it goes, and it is worth knowing why it only goes so far. USDA pairs 10.5 psi with 240F, but it attaches conditions to that pairing: the figure is for pure steam free of air, at sea level. Trapped air lowers the temperature you get at 5, 10 or 15 pounds and results in under processing, which is the entire reason venting is mandatory. Internal canner temperatures also fall as elevation rises. And NCHFP adds the caution that matters most here, that what matters is temperature rather than pressure, since reaching canning pressure does not prove the food inside the jars was heated at the same rate as in the canner the process was developed on.

So do not take any of this as a finding that your cooker runs hot enough. Nobody has measured yours. The point is narrower: the published objection is about something else entirely.

NCHFP's stated mechanism is that pressure cookers have less metal, are smaller in diameter, and use less water than pressure canners, so both the come-up time and the cool-down time are shorter. Those periods are part of the total processing heat used to set USDA process times. If the heat from them is reduced, the heat from the process time at pressure alone may not be enough to destroy the targeted microorganisms. An owner in the threads had the mechanism right without the citation:

"They heat up and cooler too fast and often lack the necessary weighted gauge or precise dial gauge to maintain the required pressure." - u/NewArborist64

Why you cannot just add ten minutes

This is the first thing most people reach for, and it is worth knowing that researchers reached for it too. For a period, adding ten minutes to standard canner times was thought to make pressure saucepans safe.

It was withdrawn, and the reason is not that extra time cannot compensate in principle. USDA trades time against temperature elsewhere, telling canners at altitude to increase process time or canner pressure to make up for lower boiling temperatures. The reason is that the work needed to pick a number was never done across the range of equipment and food. NCHFP says the ten-minute rule failed as a general recommendation because there are several sizes of pressure saucepan and they were not all adequately tested, and because heat penetration depends partly on the composition of the food, and not all foods and preparation styles were tested either.

NCHFP is also candid that it cannot quantify the piece you would be trying to replace, saying there is no way at this point in time to know exactly the percentage of contribution from cooling for each recommendation. Its conclusion is the sentence to hold on to: it cannot convert processes intended for regular pressure canners to make them safe in other equipment.

Which means the honest answer to can I just process it longer is not that longer cannot work. It is that there is no validated number to use, and inventing one yourself is the part that gets dangerous.

The label on the lid decides nothing

Here is the part that sends people in circles. American pots have been sold under both words for decades, and owners routinely find that the manual and the lid disagree:

"Some older pressure canners are labeled “pressure cookers” but are safe for pressure canning. I use an All-American 910 for both pressure canning and pressure cooking. The label on the lid says “Model 910 Pressure Cooker” but the owner’s manual details canning so I know it’s safe." - u/RufousMorph

Treat that as a prompt to check the model rather than as permission. USDA does not condemn older canners as a class, and describes the pre-1970s design honestly: heavy-walled kettles with clamp-on or turn-on lids, a dial gauge, a vent port, and a safety fuse. What it will not do is tell you that a particular pot in a particular attic still meets the definition. That is your job, and it is why we will not tell you a pot marked pressure cooker is disqualified, nor that a seller's description settles it:

"I was looking to buy a pressure canner second hand as they’re pretty pricey new. Someone reached out that they had one in storage, but when they sent me a picture of everything it only says “pressure cooker”. I asked and she said it can do both - act as a canner & pressure cooker. But reading online it said pressure cookers do not get hot enough to kill off botulism?" - u/treeshrimp420

Our read of that listing: the seller is probably describing it accurately, and the buyer still cannot act on it. A secondhand description is not provenance. The model number and the manual are.

How to identify the pot in front of you

Work through these in order. The first two settle most cases without any research at all.

• Load it with empty quart jars standing upright and count them. Four is the floor. If three is all that fits with the lid closed, you have a cooker and the question is answered.
• Look at how it holds pressure. A weighted regulator with marked settings, or a dial gauge reading to 15 psi, points at a canner. A single fixed weight that only vents, or a spring valve with no number on it, points at a cooker.
• Find the model number on the lid or the base, then find that model in the maker’s own literature. A manual that gives processing times for jars is the answer. A manual that only gives cooking times for food is also the answer.
• Count the safety devices. Modern canners carry several, and thin provision for overpressure is a signal worth taking seriously.

"If you’re anxious about using one you should definitely get a modern pressure canner, they have multiple additional safety features built in. The cooker pictured only appears to have one overpressure plug." - u/JuicyMilkweed

On a pot of real age there are further steps people skip. Extension guidance on used canners is specific about them: every part has to be present, the sealing ring and overpressure plug should be replaced, and the metal should be free of pitting. Lid locking mechanisms only became a requirement for household canners in 1979, so a pot older than that is a different machine in a meaningful way. One inheritance case in the threads was a 1930s pot:

"Hello, when cleaning out the home of a relative who passed, we found this Ball Eclipse Pressure Cooker. I’ve never done any pressure cooking, but my wife has been interested in learning about canning (I know they are a bit different). Would this still be usable?" - u/JellyBeanFingernails

That last step has a catch worth knowing before you drive anywhere. A dial gauge that reads high causes under processing, so USDA says to check dial gauges for accuracy before use each year. Many county Cooperative Extension offices will do it, usually at no charge, and the manufacturer may offer testing by mail.

Two limits apply. The common Extension tester is a Presto unit, and offices that publish their terms describe it as fitting Presto gauges plus some older National, Magic Seal and Maid of Honor models, which is a narrower list than people assume. An All American is regulated by its weighted gauge and its dial is a reference, so Extension offices say plainly that they do not test those. And tilt gauges, found on some vintage pots, can no longer be tested for accuracy at all, which makes a tilt-gauge pot a poor candidate for canning whatever else is right about it.

A weighted regulator sidesteps the whole problem. USDA notes that weighted-gauge models control pressure precisely and need neither watching during processing nor checking for accuracy. The trade is elevation: they cannot correct finely for it, so above 1,000 feet they have to be run at 10 psi instead of 5, or 15 instead of 10.

Where electric multicookers sit in this

They are not an open question, and it would be a mistake to read anything above as leaving room for one. NCHFP addressed electric multicookers directly in a 2019 statement and reached the same answer: it does not support using USDA canning processes in electric multi-cooker appliances, including the ones now sold with canning or steam canning buttons on the front panel. Its reasoning leans on the same floor used here, that the recommendations were developed for stovetop canners holding four or more quart jars upright.

There is one narrow electric exception, and it is not a multicooker: a purpose-built automatic canner for acid foods, backed by its own thermal process development. We cover the appliance question in full in our guide to canning in an Instant Pot.

What the pot you already own is still good for

Nothing here makes a pressure cooker a bad purchase. It is a useful machine that happens not to be this machine, and the owners who are clearest about the canning limit are usually fond of the cooker itself:

"Pressure cookers are awesome. I have two of them. You can’t can in them but you can whip out supper pretty quick." - u/redalastor

The reverse substitution deserves a warning too, because people assume a canner covers both jobs and are then disappointed at supper:

"Do you want a pressure cooker, or a pressure canner? Usually a pressure cooker is way smaller than a pressure canner. And although you can use a pressure canner as a pressure cooker to pressure cook large amounts of food, this large size doesn't make it suitable to pressure cook vegetables, legumes or meat that doesn't need a long time in the pressure cooker." - u/Useful_Cheesecake117

That matches our own experience. A loaded canner takes a long while to come up and a long while to come down, which is precisely the property that makes it suitable for jars and tedious for a weeknight pot of beans. If you cook under pressure often and can occasionally, there is a real case for owning both.

Who can stop reading here

If your pot holds four quart jars upright, can be vented, shows you that it held pressure for the whole process, and you can put your hands on its manual and a tested gauge or a weighted regulator, you probably have a canner no matter what the lid says. Verify the gauge and go.

If it does not hold four quarts, the question is settled, and the thing to understand is that no adjustment you can make at home closes the gap. There is no validated longer process for a smaller pot, because the testing that would produce one was never done. Keep the cooker for weeknights and buy the canner for jars.