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How Much Does It Cost to Run an Appliance?

Updated August 29, 20263 min readTime needed: 5 minutes to calculate
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Short answer: Running cost = (appliance wattage × hours used ÷ 1000) × your electricity price per kWh. A 1,500-watt space heater run 3 hours a day at $0.16/kWh costs roughly $0.72 a day, or about $22 a month.

The part people usually get wrong isn't the math — it's the inputs. The wattage printed on an appliance's nameplate is its maximum draw, not what it necessarily uses continuously: a refrigerator or water heater cycles its compressor or element on and off rather than running flat-out the whole time it's plugged in, so multiplying nameplate watts by 24 hours overstates the real cost significantly. Meanwhile a device that's merely plugged in and switched "off" — many TVs, game consoles, chargers left connected — can still draw a small, continuous standby load that adds up over a full year even though it never shows up as "in use." Get those two distinctions right and the formula below does the rest accurately.

Use our Electricity Cost Calculator to plug in an appliance's wattage and your local rate for an instant daily, monthly, and yearly estimate.

Common Symptoms

  • An unexpectedly high electricity bill with no clear cause
  • Wanting to compare running costs before buying a new appliance
  • Deciding whether an older, less efficient appliance is worth replacing

Likely Causes

1. Not knowing an appliance's actual wattage

Many people estimate running costs from an appliance's size rather than its rated power draw, which is printed on a label or in the manual.

2. Underestimating standby power

Some devices draw a small but continuous amount of power even when 'off' but still plugged in, which adds up over a full year.

3. Ignoring how electricity rates vary by time of day

Some utility plans charge different rates at peak versus off-peak hours, which changes the real cost of running high-draw appliances at certain times.

Safe Checks You Can Do

  • Double-check whether your appliance's label lists watts directly, or only amps and volts, which need multiplying together.
  • Check your utility bill for the exact per-kWh rate rather than estimating a national average, since rates vary significantly by region.

Step-by-Step Solution

  1. 1

    Find the appliance's wattage

    Check the appliance's label, nameplate, or manual for its wattage (W) or, if only amps and volts are listed, multiply amps × volts to get watts.

  2. 2

    Estimate hours of use

    Note roughly how many hours per day the appliance actually runs, not just how long it's plugged in.

  3. 3

    Find your electricity rate

    Check your utility bill for your price per kilowatt-hour (kWh), usually listed directly or calculable by dividing your bill total by your kWh usage.

  4. 4

    Calculate energy used

    Multiply watts × hours used, then divide by 1000 to convert to kilowatt-hours (kWh).

  5. 5

    Calculate the cost

    Multiply the kWh figure by your price per kWh to get the running cost for that period.

What Not to Do

  • Don't confuse an appliance's maximum rated wattage with its typical running wattage — some devices (like refrigerators) cycle on and off rather than running continuously at full power.
  • Don't forget to include appliances that draw standby power continuously, like some TVs, game consoles, and chargers.

When to Call a Professional

  • You suspect an appliance is drawing far more power than its rating suggests, which could indicate an electrical fault — have it inspected rather than continuing to use it.

Frequently Asked Questions

Which household appliances typically cost the most to run?

Heating and cooling systems, water heaters, and clothes dryers are usually the biggest contributors to a home's electricity use, since they combine high wattage with long run times.

How can I find an appliance's exact wattage?

Check the nameplate or label (often on the back or bottom of the appliance) or the product manual — it's usually listed directly, sometimes alongside amps and volts.

Does this calculation work for gas appliances?

No — this method is for electricity-powered appliances. Gas appliance running costs need a separate calculation based on your gas rate and the appliance's BTU input rating.

Home Solutions Editorial Team

Updated August 29, 2026. How we write guides

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