How to Tell the Temperature of Cooking Oil Without a Thermometer

For optimal safety, you should use a frying thermometer at all times, but for those occasions when you do not have a thermometer, you can use this old-fashioned method for approximating the temperature of the frying oil. Note that this only approximates the oil temperature.

Things You'll Need

  • Frying oil
  • Deep pot or deep fryer
  • 1-inch square piece of bread
  • Timer or watch with second hand

Instructions

  1. Heat the oil over medium heat. Avoid using high heat, which could cause the oil to heat too fast and ignite.

  2. Drop the bread into the oil and watch both the bread and the time on the watch.

  3. Watch for the bread to brown on all sides and float to the top to evaluate the temperature.

  4. Note bread that floats and browns within 20 seconds means the oil's temperature is between 382 and 390 degrees Fahrenheit; 40 seconds to brown the bread indicates 365 to 382 degrees and 60 seconds for the oil to brown the bread shows the oil at 350 to 365 degrees.