Heatwork, time and energy in one place

Kiln & Firing Calculators for Ceramic Studios

A controller displays temperature, while witness cones record heatwork: the combined effect of time and temperature on ceramic materials. That distinction matters when comparing firings or troubleshooting a result.

The firing tools below help with planning and cost allocation. Use kiln nameplate data and your utility bill for energy estimates, Orton's chart for cone equivalents, and witness cones for the final check inside the kiln.

8 working tools

Choose a calculator

01 Kiln Firing Cost Calculator Estimate the electricity cost of a kiln firing based on wattage, duration, and local electricity rates. 02 Kiln Volume Calculator Calculate the internal volume of a round or rectangular kiln to estimate load capacity. 03 Kiln Ramp Rate Calculator Calculate total firing time and check ramp rates against critical temperature danger zones. 04 Pottery Cone Chart & Temperature Calculator Convert Orton cone numbers to equivalent temperatures in Celsius and Fahrenheit. Free pottery cone chart with firing speed correction. 05 Firing Schedule Generator Generate a complete multi-segment kiln firing schedule for bisque or glaze firing. 06 Kiln Element Calculator Calculate stated kiln-element resistance and current draw with Ohm’s law and compare published alloy temperature data. 07 Kiln Cooling Rate Calculator Calculate safe kiln cooling rates for each temperature zone, with critical guidance for the quartz inversion at 573°C to prevent dunting and thermal shock. 08 Kiln Loading Calculator Calculate how many pieces fit on each shelf and in the total kiln based on kiln interior dimensions, shelf height, and piece size.