How Sous Vide Steak Timing Actually Works
With sous vide, the water-bath temperature sets your final doneness and the thickness sets your time. Because the bath is the same temperature you want the steak to reach, the steak can never overcook the way it does on a grill. A 130 F bath produces a perfect edge-to-edge medium-rare whether the steak is in for one hour or three. The only real question is how long it takes heat to travel from the surface to the cold center, and that is governed almost entirely by thickness.
Heat moves through meat by conduction, and conduction time scales with the square of thickness, not linearly. Doug Baldwin\'s heating tables make this concrete: a half-inch steak reaches its core in well under an hour, a one-inch steak needs roughly an hour and a half from the fridge, and a two-inch steak takes around three hours. Double the thickness and you roughly quadruple the time.
Time to core ≈ k × thickness² (k from Baldwin\'s slab heating table)
Temperature by Doneness
Set the bath to your target core temperature: 120 F for rare, 130 F for medium-rare, 140 F for medium, 150 F for medium-well, and 160 F for well-done. These hold true for any cut, from ribeye to filet. A frozen steak simply needs extra time to thaw and heat, which this calculator adds automatically.
The Safety and Texture Window
At or above 130 F, holding the steak long enough also pasteurizes it, so there is a generous window where it stays safe and only the texture changes slowly. Hold a medium-rare steak past four hours and the connective tissue softens until it turns mushy. Below 130 F there is no pasteurization, so those temperatures are a hot-hold only and should be served promptly and skipped by at-risk eaters.
Frequently Asked Questions
Why does thickness matter more than weight?
Sous vide cooks by conduction from the outside in, and that travel time depends on how far heat has to move, which is the thickness, not the total mass. A wide, thin steak and a narrow, thick one of the same weight cook very differently. Always measure the thickest part of the steak and use that number.
Can I overcook a steak in sous vide?
You cannot overcook it on temperature, since the bath never exceeds your target doneness. You can overcook it on texture, though: leaving a steak in for many hours past the minimum gradually breaks down the muscle fibers and turns it mushy. Stay inside the recommended hold window shown above for the best bite.
Is 130 F medium-rare safe?
Yes, as long as you hold it long enough to pasteurize. At 130 F a steak becomes safe after a sustained hold of one to two hours depending on thickness, which is why the calculator gives a minimum hold time. Temperatures below 130 F do not pasteurize, so treat rare as a hot-hold and serve it promptly.
Do I still need to sear after sous vide?
Absolutely. The water bath cooks the interior perfectly but leaves the surface pale and wet, with no crust. Pat the steak completely dry and sear it 45 to 60 seconds per side in a smoking-hot cast iron pan or with a torch to build the browned, flavorful exterior that makes a steak taste like steak.
Practical Guide for Sous Vide Steak Time & Temp Calculator
The single biggest mistake people make is timing by weight or by gut feel instead of by thickness. Because heating time scales with the square of thickness, small measurement errors compound fast. A steak you guess is one inch but is actually 1.5 inches needs more than double the time to reach a safe core temperature. Use the slimmest dimension of the thickest part of the cut, and when in doubt, round up and lean on the forgiving hold window rather than pulling the steak early.
Starting temperature changes the math but not the destination. A steak straight from the fridge has its center sitting around 41 F, while a frozen steak starts near 0 F and has to thaw before it can climb to doneness. Sous vide handles frozen steaks beautifully without any pre-thawing, but you should budget the extra heating time this calculator adds. Past the heating phase, the hold window is identical whether the steak started cold or frozen.
Think of the recommended hold as a range with a floor and a ceiling. The floor is the minimum time to bring the core to temperature and, above 130 F, to pasteurize it for safety. The ceiling is when the texture begins to suffer as collagen and muscle fibers break down too far. A medium-rare ribeye is wonderfully flexible, comfortable anywhere from about 90 minutes to 4 hours, which is what makes sous vide so convenient for dinner timing.
Quick Checklist
- Measure the thickest part of the steak and enter that exact thickness.
- Match the bath temperature to your doneness and never above it.
- Hold at least the minimum time; for any temp 130 F and up, that also pasteurizes it.
- Pat dry and sear hard for 45 to 60 seconds per side after the bath.