Cost to Run a 400-watt washing machine for 20 hours in Washington
Running a 400-watt washing machine for 20 hours uses 8 kWh and costs $0.92 at $0.115/kWh in Washington. Do that every day and it adds up to $27.60 a month.
Calculate your own cost
- Per hour
- $0.0460.4 kWh
- Per day
- $0.928 kWh
- Per week
- $6.4456 kWh
- Per month (30 days)
- $27.60240 kWh
- Per year
- $335.802,920 kWh
Formula: watts ÷ 1,000 × hours × rate. Edit any box and every number updates instantly.
People also ask
How much does a 400-watt washing machine cost per hour?
At $0.115/kWh, it costs $0.046 per hour. The maths: 400 W ÷ 1,000 = 0.4 kWh per hour, × $0.115 = $0.046.
How much does it cost per month?
Used 20 hours a day for 30 days, it costs about $27.60 per month and uses 240 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
8 kWh per day, 240 kWh per month and 2,920 kWh per year at 20 hours a day. A kWh is one kilowatt (1,000 W) used for one hour. It is the unit on your electricity bill.
How can I lower the cost?
Wash with cold water when you can. Check your bill for the exact rate and enter it above.
Does my electricity rate change the answer?
Yes, a lot. At 10¢ per kWh the monthly cost is $24.00 and at 30¢ it is $72.00. Find your rate on your bill (total cost ÷ kWh used) and type it into the calculator.
Cost by hours of use in Washington
| Used per day | Energy per day | Cost per day | Cost per month | Cost per year |
|---|---|---|---|---|
| 1 hour | 0.4 kWh | $0.046 | $1.38 | $16.79 |
| 2 hours | 0.8 kWh | $0.092 | $2.76 | $33.58 |
| 3 hours | 1.2 kWh | $0.138 | $4.14 | $50.37 |
| 4 hours | 1.6 kWh | $0.184 | $5.52 | $67.16 |
| 5 hours | 2 kWh | $0.23 | $6.90 | $83.95 |
| 6 hours | 2.4 kWh | $0.276 | $8.28 | $100.74 |
| 7 hours | 2.8 kWh | $0.322 | $9.66 | $117.53 |
| 8 hours | 3.2 kWh | $0.368 | $11.04 | $134.32 |
| 9 hours | 3.6 kWh | $0.414 | $12.42 | $151.11 |
| 10 hours | 4 kWh | $0.46 | $13.80 | $167.90 |
| 11 hours | 4.4 kWh | $0.506 | $15.18 | $184.69 |
| 12 hours | 4.8 kWh | $0.552 | $16.56 | $201.48 |
| 13 hours | 5.2 kWh | $0.598 | $17.94 | $218.27 |
| 14 hours | 5.6 kWh | $0.644 | $19.32 | $235.06 |
| 15 hours | 6 kWh | $0.69 | $20.70 | $251.85 |
| 16 hours | 6.4 kWh | $0.736 | $22.08 | $268.64 |
| 17 hours | 6.8 kWh | $0.782 | $23.46 | $285.43 |
| 18 hours | 7.2 kWh | $0.828 | $24.84 | $302.22 |
| 19 hours | 7.6 kWh | $0.874 | $26.22 | $319.01 |
| 20 hours | 8 kWh | $0.92 | $27.60 | $335.80 |
| 21 hours | 8.4 kWh | $0.966 | $28.98 | $352.59 |
| 22 hours | 8.8 kWh | $1.01 | $30.36 | $369.38 |
| 23 hours | 9.2 kWh | $1.06 | $31.74 | $386.17 |
| 24 hours | 9.6 kWh | $1.10 | $33.12 | $402.96 |
How we worked it out
- Energy per hour: 400 W ÷ 1,000 = 0.4 kWh
- Cost per hour: 0.4 kWh × $0.115 = $0.046
- Cost per day: × 20 hours = $0.92
- Month and year: × 30 days = $27.60, × 365 days = $335.80
Washington electricity prices
Washington pays about $0.115 per kWh, which is 34% lower than the US average of $0.175. The same washing machine would cost $42.00 a month at the national average.
What it costs in different places
Same 400-watt washing machine, 20 hours a day. Only the local electricity rate changes.
| Place | Rate per kWh | Cost per month |
|---|---|---|
| United States | $0.175 | $42.00 |
| California | $0.32 | $76.80 |
| Texas | $0.155 | $37.20 |
| New York | $0.25 | $60.00 |
| Florida | $0.155 | $37.20 |
| Illinois | $0.17 | $40.80 |
| Pennsylvania | $0.18 | $43.20 |
| Ohio | $0.17 | $40.80 |
| Washington | $0.115 | $27.60 |
About washing machine running costs
Washing machines use little electricity themselves. The cost comes mostly from heating water.
Typical sizes: 400 W, 500 W, 700 W, 1,000 W.
How to spend less: Wash with cold water when you can.
What this estimate assumes
- The appliance draws its full stated wattage the whole time it is on. Real units with a thermostat cycle off and cost less.
- Wattage is the typical label value, not a measured value. Check the label on your own appliance.
- The rate is an approximate residential average in Washington. Your bill may include fixed fees, tiers or time-of-use pricing. Edit the rate above.
- A month is 30 days and a year is 365 days.