Slow Cooker Temperature Conversion
350°F = 177°C
Reference Table
Temperature Scale
Context & Usage
Slow cooker low is roughly 190°F and high is roughly 300°F, both well below standard oven temperatures.
As a general rule, 1 hour in the oven equals about 4 hours on low or 2 hours on high in a slow cooker.
Older slow cooker models without a digital display sometimes run measurably hotter or cooler than a newer model at the same 'low' or 'high' label, which is worth checking with an oven thermometer placed inside if results seem consistently off.
A Worked Example
Say a stovetop braise recipe simmers for 2 hours. Using the rough 4-hours-on-low-per-1-hour-simmered guideline, that translates to about 8 hours on low, or roughly 4 hours on high — a good match for either an overnight or a workday slow-cook schedule.
Standards and Sources
Slow cooker manufacturers, including major brands tested under UL consumer safety standards, generally calibrate 'low' to around 190°F and 'high' to around 300°F internally, though exact figures vary by model.
The USDA specifically notes that slow cookers are designed to pass safely through the food safety danger zone (40-140°F) gradually during the initial heating phase without promoting bacterial growth, provided the appliance is used correctly.
University extension food safety programs recommend against using a slow cooker to reheat previously cooked, refrigerated food, since the appliance's slow initial heating isn't designed for that use case.
Where This Shows Up
Home cooks converting a stovetop braise or stew recipe for a slow cooker rely on this rough time conversion to plan a meal that's ready when they get home from work.
Meal-prep communities that batch-cook overnight or during the workday frequently reference these ratios when adapting a new recipe to their slow cooker's low or high setting.
Common Mistakes
- Opening the lid frequently to check food, which releases significant heat and can add 15-20 minutes to the total cooking time each time.
- Using frozen meat directly in a slow cooker without adjusting time, which can keep the dish in the food safety danger zone too long.
- Assuming all slow cooker brands calibrate 'low' and 'high' identically, when actual temperatures can vary meaningfully between models.
Slow Cooker Low vs High Setting
| Low Setting | High Setting | |
|---|---|---|
| Approximate temperature | 190°F (88°C) | 300°F (149°C) |
| Typical cook time | 6-10 hours | 3-5 hours |
| Best for | All-day cooking, tougher cuts | Shorter timeframes |
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Frequently Asked Questions
What temperature is slow cooker 'low'?+
About 190°F (88°C).
What temperature is slow cooker 'high'?+
About 300°F (149°C).
How do I convert a 1-hour oven recipe to a slow cooker?+
Try 4 hours on low or 2 hours on high as a starting point, then adjust based on results.
Can I leave a slow cooker on overnight safely?+
Yes, that's the appliance's intended use case, provided it's in good working condition and placed on a heat-safe surface away from flammable materials.
Does slow cooker size affect these time conversions?+
Slightly — a fuller slow cooker takes a bit longer to reach temperature than a partially filled one of the same size.