Kiln Firing Cost Calculator
Calculate the electricity or gas cost for your pottery kiln firings. Estimate costs for bisque, glaze, and specialty firings.
Kiln Settings
Firing Program
Energy Rates
Firing Cost
Firing Time
11h 18m
Peak Temperature
2228°F
Energy Used
71.5 kWh
Cost Per Cu Ft
$1.23
Firing Details
Quick Cone Reference
Tip of the Day
Replace worn elements to maintain efficiency
Cost Saving Tips
- • Fire full loads to maximize efficiency
- • Consider off-peak electricity rates (nights/weekends)
- • Maintain elements regularly for consistent heating
- • Use a kiln shelf system that allows good air flow
- • Track your firings to identify cost patterns
How to Calculate Kiln Firing Cost
Kiln firing cost is energy used (kWh) × your electricity rate, and energy used is kiln wattage × firing hours × duty cycle. Electric kilns cycle on and off rather than running at full power the whole firing, averaging a 45% duty cycle for light loads, 55% for medium loads, and 65% for heavy loads in this calculator.
Firing schedule changes the hours side of that equation: a slow schedule multiplies the base firing time by 1.3, a fast schedule by 0.75, with medium as the 1.0 baseline. Bisque firings add roughly 2 extra hours to the base time for the slower initial ramp that drives off residual water in the clay.
For emissions, the calculator uses 0.92 lbs CO2 per kWh for electric firings, versus 11.7 lbs per therm of natural gas or 12.7 lbs per gallon of propane for gas kilns.
Understanding Kiln Energy Use
Electric kilns don't run at full power continuously. They cycle on and off to hold temperature, so the energy a firing actually draws depends on firing phase, load density, and kiln insulation quality rather than rated wattage alone.
Typical Firing Times
Bisque Fire
Glaze Fire (Cone 6)
High Fire (Cone 10)
Cone Temperature Reference
Cost Factors
- Electricity rate: Varies widely ($0.08-0.30/kWh) - check your utility bill
- Kiln size: Larger kilns use more power but cost less per cubic foot
- Target temperature: Higher cones require exponentially more energy
- Firing schedule: Slow firings use more energy but may be necessary
- Element condition: Worn elements increase firing time significantly
- Load density: Full kilns are more efficient per piece
Frequently Asked Questions
How much does it cost to fire a kiln?
A typical mid-size electric kiln (7 cubic feet) firing to cone 6 costs $15-30 in electricity, depending on your local rates. High-fire to cone 10 costs more. Smaller kilns cost less. This calculator gives you an estimate based on your specific kiln and electricity rate.
Why does my kiln take longer to fire than expected?
Firing time increases with: heavy loads (more thermal mass), worn elements (less heat output), slow ramp rates programmed, lid/door seal issues, or power supply problems. Old elements can increase firing time by 30-50% before failing completely.
How can I reduce my kiln firing costs?
Fire full loads whenever possible (cost per piece drops dramatically), use off-peak electricity rates if available, maintain your kiln elements, ensure good lid/door seals, and consider the trade-off between slow firing (longer but gentler) vs fast firing (less time but more risk).
What's the difference between cone ratings?
Cones measure heat work, not just temperature. Low-fire (cone 06-04) is ~1800-1950°F, mid-fire (cone 5-6) is ~2150-2230°F, and high-fire (cone 9-10) is ~2300-2350°F. Higher cones require more energy and time, increasing cost.
How do I know when to replace kiln elements?
Replace elements when: firing time increases significantly (25%+), you see uneven heating/hot spots, elements show sagging or white/shiny spots, or the kiln can't reach target temperature. Elements typically last 100-200 firings depending on temperature and use.
Is gas or electric cheaper for kiln firing?
Gas is often cheaper per BTU but requires more skill to operate, ventilation infrastructure, and has higher upfront costs. Electric kilns are simpler, more consistent, and easier for beginners. For most hobbyists and small studios, electric is more practical despite potentially higher operating costs.
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