Appliance Running Cost Calculator
What an appliance costs to run based on wattage and usage.
Calculate appliance running costs by entering wattage, daily usage hours, electricity rate, and days per year to estimate annual spending.
What this tool does
Enter an appliance's wattage, how many hours daily it runs, your local electricity rate per kilowatt-hour, and how many days per year it operates. The calculator estimates the annual cost to run that appliance based on these inputs. The result shows total spending in your currency over a 12-month period. Wattage and daily hours used have the most direct impact on the final figure. For example, you might model the cost of running a space heater during winter months, or a refrigerator year-round. The calculation assumes consistent usage patterns and a stable electricity rate—it does not account for seasonal price changes, efficiency losses over time, or variations in actual consumption. This tool is for estimation purposes and illustrates how usage and rates combine to affect appliance costs.
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Electrical appliances vary hugely in running cost. A 2,000W kettle used 15 minutes daily costs about 0.12/day (44/year at 24p/kWh). A 300W TV on 5 hours costs about 0.36/day (131/year). Understanding individual appliance running cost helps prioritise which matter most for energy savings.
The math: (wattage × usage hours × rate) ÷ 1,000 = daily cost. Annualised for typical usage pattern. Electric kettles, ovens, and heaters have highest per-use cost (high wattage, short duration). Fridges and always-on devices have sustained low drain but add up across 24/7 operation.
The tool identifies which appliances are worth optimising. Replacing a 100W constantly-on device with 20W saves 80W × 24 × 365 ÷ 1,000 × 0.24 = 168/year. Replacing a rarely-used 2,000W kettle with a cheaper model saves very little because usage is short. Focus on the biggest drains.
What the result means
Annual running cost is the total electricity spend for this appliance. Per-hour cost normalises across different appliances. Use this to identify which devices are worth replacing or using less.
Quick example
With wattage of 300 and hours per day used of 5 (plus electricity rate per kwh of 0.24 and days per year used of 365), the result is 131.40. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.
Which inputs matter most
You enter Wattage (W), Hours Per Day Used, Electricity Rate per kWh, and Days Per Year Used.
What's happening under the hood
Wattage × hours × days ÷ 1,000 gives kWh consumed annually. Multiplied by rate per kWh for cost. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.
Why run the calculation
Utility bills creep. Small annual increases stack into meaningful differences over a decade. Running this once a year and switching providers when the gap widens is one of the easiest ways to keep household costs in check.
What this doesn't capture
Usage varies month-to-month; tariffs change; discounts come and go. The figure here is a clean baseline — your actual annual bill will fluctuate around it. Use the calculation to benchmark providers, not as a prediction of a specific bill.
A 300 WW appliance used 5 hours hours daily costs 131.40 annually to run.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
This calculator computes annual running cost by converting wattage to kilowatt-hours, then applying your electricity rate. The formula multiplies wattage by hours used per day and days used per year, then divides by 1,000 to convert watts to kilowatts. The resulting kilowatt-hour consumption is multiplied by your rate per kilowatt-hour to produce an annual cost estimate. The model assumes constant wattage during operation, a flat electricity rate year-round, and that usage patterns remain consistent. It does not account for variations in actual consumption, seasonal rate changes, demand charges, standing fees, power factor adjustments, or efficiency losses in older appliances.
Frequently Asked Questions
How do I find appliance wattage?
Does standby power matter?
What's a typical electricity rate?
Which appliances cost most to run?
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