Instant Pot Cooking Time Calculator

A sealed pressure cooker raises the boiling point of water by holding steam above atmospheric pressure. Consumer electric multicookers such as the Instant Pot regulate at roughly 10.2 to 11.6 psi gauge on the high setting, which corresponds to about 239 to 244 degrees F, and near 5.8 psi or about 229 degrees F on low. Since reaction rates roughly double for every 18 degrees F rise, that 30-degree gain over a stovetop simmer compresses cook times by a factor of three to four. Collagen hydrolysis into gelatin, the reaction that makes pot roast and short ribs tender, is the main beneficiary; dried beans behave similarly, with unsoaked black beans finishing in about 25 minutes against 90 or more by open simmer. The number the appliance displays is only the pressurized phase. Total elapsed time also includes a preheat of roughly 8 to 15 minutes while the liquid reaches steam production, and a depressurization phase of about 2 minutes for a manual quick release or 10 to 25 minutes for a natural release, during which the contents remain above 212 degrees F and keep cooking. Practical constraints follow from the physics: at least one cup of thin liquid is needed to generate steam, thick purees and tomato sauce do not count and will trigger a scorch cutoff if placed against the base, and expanding foods such as beans, grains, and pasta must not exceed the half-full line because their foam can block the release valve.

Pressure cooking was demonstrated in 1679 by the French physicist Denis Papin, who built a sealed cast-iron vessel he called the steam digester and showed it to the Royal Society in London, softening bones into edible paste and inventing the safety valve in the process. The device was too dangerous and expensive for kitchens and remained a laboratory curiosity for two centuries. Domestic versions appeared once metallurgy and sealing improved: Georg Gutbrod of Stuttgart produced tinned cast-iron cookers in the 1860s, and in 1938 Alfred Vischer introduced the Flex-Seal Speed Cooker in New York, the first practical home model. National Presto displayed a competing design at the 1939 New York World Fair, and stovetop pressure cookers spread widely during wartime food and fuel rationing. Post-war popularity in the United States collapsed after a wave of poorly built units gave the category a reputation for exploding, a reputation that persisted for decades even as European manufacturers improved interlocks. The electric multicooker revived it by removing user judgment from the process. Instant Pot was developed by Robert Wang and colleagues in Ottawa, Canada, through their company Double Insight, and the first model shipped in 2010 with microprocessor control, a locking lid, and layered pressure and thermal cutoffs. Sales grew largely through online reviews and Amazon promotions rather than retail distribution, and by the late 2010s the product had made pressure cooking mainstream again in North America.