Tuna steak sous vide time by thickness
A 1 inch tuna steak takes about 58 min for the core to reach bath temperature, at a typical 115 F. Thickness sets that time, not weight: doubling the thickness roughly quadruples it. The USDA safe minimum internal temperature for this category is 145 F.
How long does tuna steak take by thickness?
The figures below are come-up times: how long the centre takes to reach the temperature of the bath around it. They are calculated, not measured. The model is one dimensional conduction, where time scales with the square of thickness, and a slab shape is assumed. A flat slab is the slowest common shape, because heat only arrives from two faces.
| Thickness | Millimetres | Time to core | Bath temperature |
|---|---|---|---|
| 0.75 in | 19 mm | 34 min | 115 F |
| 1 in | 25 mm | 58 min | 115 F |
| 1.25 in | 32 mm | 1 h 35 min | 115 F |
Usually held well below any pasteurization temperature, which is a choice with consequences.
Why thickness and not weight
Heat enters through the surface and travels inward, so the only distance that matters is from the surface to the centre, which is half the thickness. Weight tells you nothing about that distance. Two steaks of identical weight, one wide and thin and one narrow and thick, need very different times, and the thick one needs roughly four times as long if it is twice as thick.
This is also why the table stops at come-up time. Once the core is at temperature, a tender cut is done. A tough cut is only beginning: collagen conversion takes hours at temperature and is unrelated to thickness. Those are two different clocks and conflating them is the most common sous vide mistake after not sinking a floating bag.
Gear that fits these numbers
What this job needs
EVERIE 12 Quart Sous Vide Container Kit
Container, hinged lid, divider rack and insulating sleeve together. The sleeve matters more than it sounds: less heat leaving the walls means the element cycles less and holds tighter.
ThermoWorks Thermapen ONE
One second and half a degree. On a page about pasteurization that accuracy is not a luxury, it is the difference between a figure meaning something and not.
Anova Precision Vacuum Sealer Pro
A wet mode that pulls a shorter, gentler vacuum is what lets an external sealer handle a marinated steak without sucking liquid into the pump.
Prices when last checked. They change often.
Frequently asked questions
How long does tuna steak take at 0.75 inches?
About 34 min for the core to reach bath temperature. That is come-up time, not total cook time: tough cuts then need hours more at temperature to convert collagen, and that part has nothing to do with thickness.
Does weight change the sous vide time?
No. Heat travels into a piece from its surface, so the distance to the centre is what matters, and that distance is half the thickness. A wide thin steak and a narrow thick one can weigh the same and need very different times. Measure the thickest point with a ruler, not the scale.
Is 115 F safe?
115 F is a texture target, not a safety statement. The USDA safe minimum internal temperature for this category is 145 F. Below that figure, safety depends on holding the core at temperature long enough to reach the required log reduction, and those times come from the FSIS Appendix A tables for your specific product. We do not reproduce them, because a single number would be wrong for somebody.
Where do the numbers on this page come from?
CALCULATED from a one dimensional conduction model where time scales with the square of thickness. These figures round long on purpose. Nothing here comes from cooking test batches in our own kitchen, and we do not claim otherwise. Where the USDA or FSIS publishes a figure we quote it and link the source. Where we have no defensible figure we say so rather than estimate one.
Sources
Published figures, quoted as published. We do not generate our own time and temperature data.
How we research: we compare manufacturer specifications, owner manuals, published USDA and FSIS figures and recurring themes in verified owner reviews. We do not cook test batches or run instruments, and nothing here is professional food safety advice. When a figure is not published by a source we trust, we say so rather than estimate one.