Laundry Cost Calculator

Introduction to the Cost of Washing and Drying Laundry

The cost of one laundry load is spread across several bills and purchases. The washer uses electricity for its motor, pump, and controls. A warm or hot wash also requires the household water heater to supply heat. The dryer may consume several kilowatt-hours or a combination of electricity and natural gas. Water and sewer charges apply to the full volume drawn, while detergent and other supplies add a direct per-load expense.

This laundry cost calculator combines those expenses into an estimated cost per load. It also projects weekly, monthly, and yearly spending from the number of loads you run. The result is most useful for comparing habits: you can calculate once with a warm wash and electric dryer, then change only the wash temperature or drying method to see the difference.

The defaults describe a plausible U.S. household rather than every home. They use a 14-gallon ENERGY STAR front-load washer, a warm wash, an electric resistance water heater, an 8.45-pound dry load, and a conventional vented electric dryer. Replace the energy and water rates with the marginal rates shown on your own bills. Fixed service fees should not be included because they usually do not change when you run one additional load.

How to Use the Laundry Cost Calculator

Start with the washer type. Choosing a preset fills the water-use, wash-fill-share, and washer-energy fields. ENERGY STAR reports that a certified full-sized washer uses about 14 gallons per load, while a standard new washer may use about 20 gallons. Older agitator top-loaders can use 30 gallons or more. Choose Custom when you have figures from an appliance manual, an efficiency label, or a direct measurement.

The wash-fill share is the percentage of total water assigned to the main wash rather than cold rinses. Only that share is eligible for heating in this model. The temperature selection then determines how much of the wash fill is hot water: cold uses 0%, warm uses 50%, and hot uses 100%. These are practical mixing assumptions, not promises that every washer uses the same valve timing.

Select the household water heater and enter its setpoint and the incoming cold-water temperature. The uniform energy factor, or UEF, represents useful heat delivered relative to purchased energy. An electric resistance tank has a default UEF of 0.92, while a heat-pump water heater is assigned 3.30 because it moves environmental heat. Gas storage and tankless heaters use lower fuel-efficiency values. If a washer heats water internally, select the internal electric-heater option.

For drying, enter the dry weight of the load and the dryer’s combined energy factor, or CEF. CEF is measured in pounds dried per kilowatt-hour equivalent, so a larger number indicates a more efficient dryer. The preset values are 3.73 lb/kWh for a vented electric dryer, 5.20 lb/kWh for a heat-pump dryer, and 3.30 lb/kWh for a gas dryer. Line drying sets drying energy to zero. For gas dryers, auxiliary electricity covers the motor, fan, controls, and igniter.

Enter electricity in dollars per kWh and natural gas in dollars per therm. For water and sewer, copy the combined variable rate and choose its billing unit. The calculator supports a gallon, 1,000 gallons, one CCF equal to 748 gallons, or one cubic meter equal to 264.172 gallons. Add the cost of one detergent dose and any routine softener, bleach, or booster. Finally, enter loads per week for household projections. Decimal entries such as 3.5 are accepted.

Formulas for Water Heating, Drying, and Total Laundry Cost

Plain-text formulas: totalCostPerLoad = waterCost + waterHeatingCost + washerElectricityCost + dryerCost + suppliesCost; annualCost = totalCostPerLoad * loadsPerWeek * 52.

The water-heating calculation begins with gallons per load, the wash-fill share, and the hot-water fraction. Water weighs approximately 8.34 pounds per U.S. gallon, and raising one pound of water by 1°F requires approximately one British thermal unit. Dividing by 3,412.14 converts British thermal units to kilowatt-hours, while division by UEF accounts for heater efficiency:

In this expression, G is total gallons, s is wash-fill share, f is the hot-water fraction, and the two temperatures are measured in °F. A setpoint below the inlet temperature produces zero heating rather than a negative cost.

Dryer cycle energy is the load’s dry weight divided by CEF:

For a gas dryer, the auxiliary electricity is separated from the total energy equivalent. The remainder is converted to therms using 100,000 British thermal units per therm:

The water and sewer charge is the load volume multiplied by the entered rate after that rate has been converted to dollars per gallon:

The complete per-load total adds water heating, washer operation, drying, water and sewer, and supplies. Electric and gas energy are priced with their corresponding rates:

The yearly estimate uses 52 weeks. The monthly figure is the yearly result divided by 12 rather than assuming exactly four weeks per month:

Worked Example: A Warm Wash and Vented Electric Dry

Consider the default 14-gallon washer. Half of its water is assigned to the wash fill, and a warm setting makes half of that fill hot. The heated volume is therefore 14 × 0.50 × 0.50, or 3.5 gallons. With a 120°F setpoint, 58°F inlet, and 0.92 UEF, the calculator estimates 0.577 kWh of purchased water-heating energy. At $0.173 per kWh, that portion costs about $0.10.

The washer motor and controls use 0.12 kWh, costing about $0.02. An 8.45-pound load divided by a dryer CEF of 3.73 uses approximately 2.27 kWh, costing about $0.39. Fourteen gallons at $12 per 1,000 gallons adds $0.168, and detergent adds $0.28. The combined estimate rounds to approximately $0.96 per load.

At five loads per week, that is about $4.80 per week and roughly $250 per year. Selecting cold wash removes the water-heating charge and lowers the result to about $0.86. Keeping the warm wash but line drying removes the conventional dryer charge and lowers it to about $0.57. The comparison shows why dryer use and wash temperature usually matter more than small changes in washer motor consumption.

Interpreting the Laundry Result and Its Limitations

The result table separates each cost so you can identify the largest component. A total below roughly $0.60 may indicate cold washing, efficient drying, low utility rates, or inexpensive supplies. A result from about $0.60 to $1.20 is plausible for an efficient washer paired with a conventional dryer. A higher result is not automatically wrong: expensive electricity, high water rates, hot washing, an older high-fill washer, or costly detergent can push the total above that range.

This is a marginal usage estimate, not a complete ownership-cost analysis. It excludes appliance purchase, financing, delivery, installation, repairs, maintenance, and replacement. It also excludes fixed utility charges and taxes that do not change with one more cycle. Those exclusions make the calculator useful for deciding whether a habit change saves money, but unsuitable for comparing the full lifetime cost of home appliances with laundromat prices.

Actual cycles vary. Moisture sensors may stop a dryer early, while over-drying can use more energy than a rating suggests. Incoming water temperature changes with season and location. Some washers use onboard heaters, recirculation pumps, or warm rinses. CEF and UEF are standardized efficiency measures, not direct meter readings for every cycle. For the strongest estimate, use measured appliance energy and water figures where available.

Load frequency matters as much as cost per load. A washer often uses similar water and motor energy for a partial load, so combining compatible items into fewer properly filled loads can reduce annual spending. Do not overfill a machine, however, because restricted movement can reduce cleaning and drying performance. The best comparison changes one input at a time and focuses on the difference between scenarios.

Frequently Asked Questions About Laundry Costs

Sources and Standards for the Laundry Assumptions

The defaults are starting points based on federal appliance programs, test procedures, energy statistics, and standard unit conversions. Rates change over time, so current local bills should take priority.

• ENERGY STAR clothes washers provides comparative water-use and energy guidance.
• ENERGY STAR clothes dryer criteria explains combined energy factor and standard test loads.
• DOE clothes washer test procedure documents standardized supply temperatures and test conditions.
• U.S. EIA residential electricity data publishes updated average electricity prices.
• U.S. EIA natural gas prices provides residential gas-price data.
• EPA WaterSense methodology discusses water-cost assumptions.
• DOE Energy Saver laundry guidance covers temperature, load size, and efficiency choices.

Conversions use 1 kWh = 3,412.14 British thermal units, 1 therm = 100,000 British thermal units, 1 CCF = 748 gallons, and 1 cubic meter = 264.172 U.S. gallons. Water is approximated at 8.34 pounds per gallon near room temperature.