Kiln Element Life Calculator

The calculator uses a fixed lifespan per max-cone setting — about 200 firings for Cone 06, 125 for Cone 6, and only 65 for Cone 10 — because higher-temperature firings push elements much harder and cause faster oxidation and thinning of the resistance wire. If you mostly fire low but occasionally push to a higher cone, select the highest cone you typically reach, since that's what the model assumes for every firing.

Element Health is simply your remaining firings divided by the total lifespan for your selected max cone, so it tracks straight-line usage against the typical firing count. Power Efficiency instead models gradual power loss from oxidation, assuming each firing costs about 0.5% of original efficiency, floored at 50% so the number never implies a working element is producing zero heat — the two numbers can diverge if your actual firing count differs from what a typical lifespan schedule would predict.

No — this calculator's math never looks at Element Age. Remaining firings, months remaining, health, and efficiency are all derived purely from Total Firings Done and Typical Max Cone, so an old and a brand-new element with the same firing count come out with identical health and efficiency numbers; the age field is there only so you have it on hand.

It divides your remaining firings (lifespan minus firings already done) by your entered average firings per month, so doubling how often you fire halves the estimated months left even though the underlying element wear per firing hasn't changed. This makes the months figure a scheduling convenience on top of the firings-based estimate, not a separate wear model.