How Much Does It Cost to Fire a Kiln?

For most home and studio kilns, a single firing costs just a few dollars. Here's how to estimate your own number — and what actually moves it.

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It's one of the first questions new kiln owners ask, and it's usually driven by a fear that firing will be expensive. The good news: for most home and studio kilns, a single firing costs somewhere in the range of a few dollars to around ten — far less than the clay, glaze, and time that went into the work inside it. Here's how to figure out your own number.

The simple formula

Electricity is billed in kilowatt-hours (kWh), so your cost per firing is just:

Your electricity rate is on your utility bill. In the U.S. it commonly runs somewhere around 12–30¢ per kWh depending on where you live, with the U.S. residential average around 16–18¢ per kWh. The kWh a firing uses depends on your kiln's size, how hot and how long it fires, and how full it's packed.

Estimating the kWh

A kiln's elements don't draw full power the whole time — they cycle on and off to hold the climb, so a firing uses less than the kiln's peak wattage times the hours. As a rough planning figure, a typical medium studio kiln uses somewhere around 40–70 kWh for a full glaze firing to cone 6. Smaller kilns and lower-temperature bisque firings use less; large kilns and high-fire (cone 10) firings use more.

What moves the number

• Temperature. A cone 06 bisque firing uses noticeably less energy than a cone 10 high-fire. Mid-fire (cone 6) sits in between and is part of why it's so popular.
• Kiln size. A bigger chamber takes more energy to heat — but it also fires more work at once, so the cost per piece often drops when you pack it full.
• How full you pack it. Firing a nearly empty kiln is the most expensive way to fire. Batch your work.
• Insulation, age, and elements. Worn elements and aging brick make a kiln work harder and cost more. A well-maintained kiln fires efficiently for years.
• Your electrical service. The voltage and circuit don't change the energy used, but they determine which kilns you can run at all.

The bottom line

Firing cost is real, but it's rarely the deciding factor in owning a kiln — it's typically a few dollars a firing, dwarfed by materials and the purchase itself. The smarter money questions are choosing a kiln that fits your work and your electrical service, and firing full loads. Do those two things and the per-piece cost takes care of itself.