cone offset calculator

<Back to Calibrating Your Kiln

Instructions

Place a cone pack (guide, target, guard) on each shelf—e.g., if you're targeting a cone 6 firing, use 5 (guide), 6 (target), and 7 (guard). 

Ideally, you should place a cone pack in each zone of your kiln. 

After firing, use the Orton Measuring Template (see below for reference) to measure whichever cone bent within the range of 10°–90°. 

The cone you chose to measure is your "measured cone."

Enter the target cone, measured cone, and angle into the calculator above.

Use the result as a Cone Offset in your controller, or adjust the peak temp manually.

Bonus: For uneven zones, if your kiln has multiple thermocouples, you can use that zone’s cone reading to set a Thermocouple Offset.

Note: Thermocouple Offsets are reversed—positive = less heatwork, negative = more heatwork.