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Free setup planning tool

Reptile heating electricity cost calculator

Model the electricity used by lamps, ceramic emitters, heat panels, and other heating devices. Enter the rate from your own bill so the result reflects your circumstances.

How the estimate works

From device wattage to an energy estimate

The calculator multiplies rated wattage by quantity, operating time, days, and the duty-cycle fraction. It then divides watt-hours by 1,000 to report kilowatt-hours. Your electricity price is applied only after energy use is calculated.

A thermostat may switch or modulate some heaters, but this tool cannot predict that behavior. Enter a measured duty cycle when you have one, or label the percentage as your estimate.

Heating electricity calculation flow Device wattage, quantity, schedule, and user-entered duty cycle combine into kilowatthours. Kilowatthours multiplied by the user-entered electricity rate produce an estimated cost. YOUR INPUTSwatts x quantityhours x daysduty cycle ENERGYdivide by 1,000 = kWh RATEyour cost / kWh COSTestimate
The calculator does not predict thermostat behavior. Enter a measured or explicitly estimated duty cycle when a device does not run continuously.

Your configuration

Estimate heating energy and cost

Use the energy rate from your bill. Do not include the currency symbol.
Configuration A

Formula

The calculation

energy kWh = watts × quantity × hours per day × days per month × duty cycle ÷ 1,000

Duty cycle is used as a decimal in the calculation: 100% is 1 and 50% is 0.5. Annual estimates use 12 monthly periods unless you provide a summer and winter schedule totaling 12 months.

The watt-to-kilowatt-hour conversion follows the standard relationship that 1 kilowatt equals 1,000 watts. See the U.S. Energy Information Administration explanation of electricity measurement.

Worked example

One 100 W heater

A 100 W device running 10 hours per day for 30 days at 100% duty cycle uses 30 kWh for that month.

At an illustrative rate of 0.20 currency units per kWh, that is 6.00 currency units. The 0.20 rate is only an example, not a typical or recommended electricity price.

Assumptions and limits

What this estimate does not know

  • Rated wattage may differ from measured draw, especially for multi-setting equipment.
  • Actual thermostat duty cycle changes with room temperature, enclosure construction, ventilation, and control method.
  • Electricity bills may include taxes, tiers, time-of-use rates, fixed charges, and other fees that a single per-kWh price does not model.
  • Results are planning estimates, not electrical-safety or husbandry advice. Follow manufacturer load limits and use suitable controls.
  • Shared query parameters restore inputs in the browser. They are not separate canonical pages and no account or backend is used.

Plan the whole setup

Bearded Dragon temperature and heatingMeasure a usable thermal gradient and troubleshoot the setup safely. Reptile heating and lighting principlesReview the roles of heat, light, UVB, and environmental measurement. Equipment selection guidanceCheck source status and category-specific questions before choosing equipment.