Instant Pot Conversion Chart: Oven Time → Pressure Minutes
August 10, 2026
You found a stew recipe that braises for two hours in the oven. You want it tonight, in the Instant Pot, and the internet tells you to cook it for “about a third of the time.” Forty minutes, then. So you set forty minutes, walk away, and dinner lands on the table an hour and five minutes later — with beef that’s somehow both cooked and still chewy.
Two things went wrong, and neither is the recipe’s fault. The one-third rule isn’t one number, it’s six. And the number you set on the pot is not the number that matters for planning dinner.
The short answer
Multiply the conventional time by the factor for your food, then add roughly 25 minutes of overhead. For a 60-minute conventional recipe:
| Food | Factor | Pressure time | Best release |
|---|---|---|---|
| Root vegetables | ×0.20 | 12 min | Quick |
| Dried beans | ×0.25 | 15 min | Natural |
| Beef roast / stew | ×0.33 | 20 min | Natural |
| Rice / grains | ×0.35 | 21 min | Natural 10 min |
| Chicken pieces | ×0.40 | 24 min | Quick |
| Soup / broth | ×0.40 | 24 min | Natural |
That’s the same table behind our Instant Pot time converter — enter your recipe’s time, pick the food, and it does the arithmetic plus the overhead below.
The classic “one third” rule you’ll read at Blue Jean Chef and most pressure-cooking guides is the beef-stew case, ×0.33. It’s a genuinely good default — it’s just the middle of a range that runs from ×0.20 to ×0.40, and the ends of that range are where people get burned.
Why the factor isn’t one number
Pressure cooking doesn’t speed everything up equally, because “done” means different things to different foods.
Dense, collagen-rich meat (chuck, shin, short rib) is waiting on collagen to melt into gelatin. That’s a slow chemical conversion, and every extra degree accelerates it dramatically — which is exactly what pressure provides. Big speed-up: ×0.33, and beans do even better at ×0.25 because they’re waiting on water to penetrate and starch to hydrate, both of which love heat and pressure.
Lean, quick-cooking things — chicken pieces, thin soups — were never limited by temperature in the first place. They were limited by how fast heat reaches the middle, and the middle of a chicken thigh is only a couple of centimetres from the surface. Pressure helps, but less: ×0.40.
Root vegetables are the outlier in the other direction, ×0.20. A potato in the oven spends most of an hour just heating through in dry air. Submerged in water at 115 °C, it’s soft in minutes. The mistake here is treating vegetables like meat and turning them to purée.
The memorable version: the longer a food’s conventional cooking time is because of chemistry, the more pressure helps. The longer it is because of geometry, the less.
Your Instant Pot is not a 15 psi pressure cooker
Here’s the fact that quietly breaks half the pressure-cooker charts on the internet.
Classic stovetop pressure cookers — and the cookbooks written for them — are built around 15 psi, which puts water at about 121 °C (250 °F). Instant Pot’s own specifications list high pressure as 10.2–11.6 psi, and low pressure as 5.8–7.2 psi. On a Duo Crisp, Instant Pot states a working temperature of roughly 239–244 °F (115–118 °C).
That gap looks trivial written down — six degrees. It isn’t. Cooking rates climb steeply with temperature, which is why the usual advice is to add 7–15% to a stovetop-pressure-cooker recipe when you make it in an electric pot. It’s also why an Instant Pot recipe that “should” take 20 minutes sometimes wants 23.
Two practical consequences:
- A cookbook written for a stovetop cooker will slightly undercook in an Instant Pot. Add roughly 10% and check.
- Low pressure is not a small adjustment. At 5.8–7.2 psi you’re cooking near 110 °C rather than 116 °C. Our converter multiplies the time by about 1.6× on the low setting, and that figure is honest guesswork — no manufacturer or extension service publishes a low-pressure conversion factor. Use low pressure for delicate things (fish, eggs, tender vegetables) where you want gentleness, not for hitting a schedule.
The minutes nobody counts
This is where the “forty minutes” stew actually went wrong. The number you dial in is the number the pot counts after it reaches pressure. Around it sit two chunks of real time:
| Stage | Typical time |
|---|---|
| Come to pressure | ~10 min (5–20, depending on how full and how cold) |
| Pressure cook | the number you set |
| Quick release | ~2 min |
| Natural release | ~15 min (longer for a full pot) |
So a 20-minute stew is a 45-minute stew from button to bowl. A pot straight out of the fridge, filled to the brim, takes longer still — coming to pressure means boiling all that liquid, and there’s no shortcut. The converter shows both numbers side by side for exactly this reason: the pressure time is what you set, the total time is what you plan around.
Don’t treat natural release as dead time. For roasts, beans and anything soupy, that slow depressurisation is part of the cooking — it keeps meat from seizing and stops starchy liquid from foaming out of the valve. Quick-releasing a pot of beans is how you get a bean-flavoured ceiling. Conversely, chicken pieces and vegetables want a quick release, because 15 extra minutes of carry-over is 15 minutes of overcooking.
Altitude: the adjustment most charts skip
Lower air pressure means water boils cooler, and your pressure cooker’s ceiling drops with it. The standard rule — +5% cooking time per 1,000 ft above 2,000 ft — is what Colorado State University Extension publishes for electric pressure cookers:
| Elevation | CSU adjustment | Our band |
|---|---|---|
| Under 2,000 ft (600 m) | — | 0% |
| 3,000 ft (900 m) | +5% | +5% |
| 4,000 ft (1,200 m) | +10% | +10% |
| 5,000 ft (1,500 m) | +15% | +15% |
| 7,000 ft (2,100 m) | +25% | +25% |
| 10,000 ft (3,000 m) | +40% | +25% (cap) |
Our converter groups these into bands and uses the lower end of each, so it’s deliberately conservative — better to check and add three minutes than to serve mush. Above about 7,500 ft, add time beyond what the tool suggests.
CSU’s testers add a useful caveat that most blogs leave out: they didn’t always find the adjustment necessary. It mattered most for dry beans, rice, and heating milk for yoghurt — the foods where the cooking is about water getting into starch. A stew at 5,000 ft is far more forgiving than a pot of chickpeas.
Liquid: the rule that triggers the burn warning
A pressure cooker cooks with steam, so it needs enough thin liquid to make steam. Instant Pot’s minimums are larger than the “one cup” you’ll see quoted everywhere, and they scale with the pot:
| Pot size | Minimum liquid |
|---|---|
| 3 qt | 1 cup (250 ml) |
| 6 qt | 1½ cups (375 ml) |
| 8 qt | 2 cups (500 ml) |
| 10 qt | 2½ cups (625 ml) |
“Thin” is the operative word. Tomato sauce, coconut milk and thick barbecue glaze don’t count — they sit on the base, scorch, and trigger the BURN sensor. Layer thick sauces on top without stirring, with water or stock underneath.
And in the other direction: because almost nothing evaporates under pressure, an oven recipe’s liquid is usually 25–30% more than you need. Cut it back (while respecting the minimum above) or you’ll be reducing a watery sauce on Sauté for ten minutes afterwards — which erases the time you saved.
Converting a recipe, start to finish
Take a beef stew: 2 hours at 160 °C in the oven, 1 litre of stock.
- Time: 120 min × 0.33 = 40 minutes at high pressure.
- Liquid: cut the litre to about 700 ml — still well over the 6-qt minimum.
- Release: natural, because it’s a roast-type cut in a lot of liquid.
- Plan: 10 min to pressure + 40 + 15 natural = about 65 minutes to the table.
- Check, don’t trust. Pressure-cook times are estimates; if the beef isn’t yielding, reseal for another 8 minutes. You can always add time — you can never take it back. And always cook meat and poultry to a safe internal temperature, checked with a thermometer, rather than to the clock.
That’s the whole method, and the Instant Pot converter does steps 1 and 4 in one go, including the altitude and release adjustments.
If you’re adapting the same recipe to a different machine or a different crowd, the air fryer converter handles the oven-to-basket version of this problem, the recipe scaler rewrites the quantities when you’re feeding more people, and the oven temperature converter sorts out °F, °C and gas marks before you start.