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Pot Roast Cooking Time Calculator

Written by · Updated August 13, 2026

Enter your chuck roast’s weight for an oven braise time at 325°F until fork-tender, with slow cooker and Instant Pot alternatives in the tips.

Cook time
Active cook
Rest
15 min
Total
Cook to
Fork-tender, well past 200°F so the collagen melts

Cooked in oven / Dutch oven at 325°F (165°C). Times are estimates, always confirm with a meat thermometer.

How long to cook pot roast

The cooking time for pot roast depends mainly on its weight and how you’re cooking it. As a starting point, the table below shows estimates in oven / Dutch oven at 325°F (165°C) for the oven / dutch oven braise (325°f) method. Add the resting time, and remember a thermometer is the only way to know it’s truly done.

Pot Roast cooking time by weight

WeightActive cook (Oven / Dutch oven braise (325°F))+ Rest
2 lb 2 hr 2 hr 15 min
2.5 lb 2 hr 30 min 2 hr 45 min
3.5 lb 3 hr 30 min 3 hr 45 min
4 lb 4 hr 4 hr 15 min
4.5 lb 4 hr 30 min 4 hr 45 min
5.5 lb 5 hr 30 min 5 hr 45 min
6 lb 6 hr 6 hr 15 min

Safe internal temperature

Cook to: Fork-tender, well past 200°F so the collagen melts.

Tips

  • Sear the meat first for deeper flavor, then braise covered in liquid.
  • Slow cooker: about 8 hours on low or 4–5 hours on high.
  • Instant Pot: roughly 20 minutes per pound on high pressure, then natural release.
These times are estimates that vary with your oven, the starting temperature of the meat and other factors. Always verify doneness with a food thermometer before serving.

Frequently asked questions

How long does a pot roast take?

Braised in a 325°F oven, allow about 1 hour per pound until fork-tender. In a slow cooker it’s about 8 hours on low; in an Instant Pot roughly 20 minutes per pound on high pressure plus natural release.

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