Skrunks Web TFR Calculator

Enter resistance values (Ω) for each temperature row. Use the unit toggle to switch display between °F and °C.

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TCR Burnoff Calculator

Enter your cold resistance (in ohms) below. This calculator assumes that at 600°F your device's resistance will be 0.79 Ω for XL cups and 0.90 Ω for SM cups as required for burnoffs.

Cup Size

Warning: This tool performs standardized math for the temperature coefficient of resistance and then subtracts 3. While this should be accurate for all devices, it may not be accurate for yours. As such, Skrunk is not responsible for any damaged cups or mods that may occur due to the use of this calculator.

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