Cost to Run a 400-watt washing machine for 15 hours
Running a 400-watt washing machine for 15 hours uses 6 kWh and costs $1.05 at $0.175/kWh. Do that every day and it adds up to $31.50 a month.
Calculate your own cost
- Per hour
- $0.070.4 kWh
- Per day
- $1.056 kWh
- Per week
- $7.3542 kWh
- Per month (30 days)
- $31.50180 kWh
- Per year
- $383.252,190 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 $0.175/kWh, it costs $0.07 per hour. The maths: 400 W ÷ 1,000 = 0.4 kWh per hour, × $0.175 = $0.07.
How much does it cost per month?
Used 15 hours a day for 30 days, it costs about $31.50 per month and uses 180 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
6 kWh per day, 180 kWh per month and 2,190 kWh per year at 15 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 $18.00 and at 30¢ it is $54.00. Find your rate on your bill (total cost ÷ kWh used) and type it into the calculator.
Cost by hours of use
| Used per day | Energy per day | Cost per day | Cost per month | Cost per year |
|---|---|---|---|---|
| 1 hour | 0.4 kWh | $0.07 | $2.10 | $25.55 |
| 2 hours | 0.8 kWh | $0.14 | $4.20 | $51.10 |
| 3 hours | 1.2 kWh | $0.21 | $6.30 | $76.65 |
| 4 hours | 1.6 kWh | $0.28 | $8.40 | $102.20 |
| 5 hours | 2 kWh | $0.35 | $10.50 | $127.75 |
| 6 hours | 2.4 kWh | $0.42 | $12.60 | $153.30 |
| 7 hours | 2.8 kWh | $0.49 | $14.70 | $178.85 |
| 8 hours | 3.2 kWh | $0.56 | $16.80 | $204.40 |
| 9 hours | 3.6 kWh | $0.63 | $18.90 | $229.95 |
| 10 hours | 4 kWh | $0.70 | $21.00 | $255.50 |
| 11 hours | 4.4 kWh | $0.77 | $23.10 | $281.05 |
| 12 hours | 4.8 kWh | $0.84 | $25.20 | $306.60 |
| 13 hours | 5.2 kWh | $0.91 | $27.30 | $332.15 |
| 14 hours | 5.6 kWh | $0.98 | $29.40 | $357.70 |
| 15 hours | 6 kWh | $1.05 | $31.50 | $383.25 |
| 16 hours | 6.4 kWh | $1.12 | $33.60 | $408.80 |
| 17 hours | 6.8 kWh | $1.19 | $35.70 | $434.35 |
| 18 hours | 7.2 kWh | $1.26 | $37.80 | $459.90 |
| 19 hours | 7.6 kWh | $1.33 | $39.90 | $485.45 |
| 20 hours | 8 kWh | $1.40 | $42.00 | $511.00 |
| 21 hours | 8.4 kWh | $1.47 | $44.10 | $536.55 |
| 22 hours | 8.8 kWh | $1.54 | $46.20 | $562.10 |
| 23 hours | 9.2 kWh | $1.61 | $48.30 | $587.65 |
| 24 hours | 9.6 kWh | $1.68 | $50.40 | $613.20 |
How we worked it out
- Energy per hour: 400 W ÷ 1,000 = 0.4 kWh
- Cost per hour: 0.4 kWh × $0.175 = $0.07
- Cost per day: × 15 hours = $1.05
- Month and year: × 30 days = $31.50, × 365 days = $383.25
What it costs in different places
Same 400-watt washing machine, 15 hours a day. Only the local electricity rate changes.
| Place | Rate per kWh | Cost per month |
|---|---|---|
| United States | $0.175 | $31.50 |
| California | $0.32 | $57.60 |
| Texas | $0.155 | $27.90 |
| New York | $0.25 | $45.00 |
| Florida | $0.155 | $27.90 |
| Illinois | $0.17 | $30.60 |
| Pennsylvania | $0.18 | $32.40 |
| Ohio | $0.17 | $30.60 |
| Washington | $0.115 | $20.70 |
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. 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.