How Much Does A Humidifier Cost to Run in United Kingdom?
A humidifier typically uses 40 watts. At 8 hours a day and £0.27/kWh in United Kingdom, it costs about £0.086 per day, £2.59 per month and £31.54 per year.
Calculate your own cost
- Per hour
- £0.0110.04 kWh
- Per day
- £0.0860.32 kWh
- Per week
- £0.6052.24 kWh
- Per month (30 days)
- £2.599.6 kWh
- Per year
- £31.54117 kWh
Formula: watts ÷ 1,000 × hours × rate. Edit any box and every number updates instantly.
People also ask
How much does a 40-watt humidifier cost per hour?
At £0.27/kWh, it costs £0.011 per hour. The maths: 40 W ÷ 1,000 = 0.04 kWh per hour, × £0.27 = £0.011.
How much does it cost per month?
Used 8 hours a day for 30 days, it costs about £2.59 per month and uses 9.6 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
0.32 kWh per day, 9.6 kWh per month and 117 kWh per year at 8 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?
Pick a cool-mist ultrasonic model if cost matters most. 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 $0.96 and at 30¢ it is $2.88. Find your rate on your bill (total cost ÷ kWh used) and type it into the calculator.
Cost by hours of use in United Kingdom
| Used per day | Energy per day | Cost per day | Cost per month | Cost per year |
|---|---|---|---|---|
| 1 hour | 0.04 kWh | £0.011 | £0.324 | £3.94 |
| 2 hours | 0.08 kWh | £0.022 | £0.648 | £7.88 |
| 3 hours | 0.12 kWh | £0.032 | £0.972 | £11.83 |
| 4 hours | 0.16 kWh | £0.043 | £1.30 | £15.77 |
| 5 hours | 0.2 kWh | £0.054 | £1.62 | £19.71 |
| 6 hours | 0.24 kWh | £0.065 | £1.94 | £23.65 |
| 7 hours | 0.28 kWh | £0.076 | £2.27 | £27.59 |
| 8 hours | 0.32 kWh | £0.086 | £2.59 | £31.54 |
| 9 hours | 0.36 kWh | £0.097 | £2.92 | £35.48 |
| 10 hours | 0.4 kWh | £0.108 | £3.24 | £39.42 |
| 11 hours | 0.44 kWh | £0.119 | £3.56 | £43.36 |
| 12 hours | 0.48 kWh | £0.13 | £3.89 | £47.30 |
| 13 hours | 0.52 kWh | £0.14 | £4.21 | £51.25 |
| 14 hours | 0.56 kWh | £0.151 | £4.54 | £55.19 |
| 15 hours | 0.6 kWh | £0.162 | £4.86 | £59.13 |
| 16 hours | 0.64 kWh | £0.173 | £5.18 | £63.07 |
| 17 hours | 0.68 kWh | £0.184 | £5.51 | £67.01 |
| 18 hours | 0.72 kWh | £0.194 | £5.83 | £70.96 |
| 19 hours | 0.76 kWh | £0.205 | £6.16 | £74.90 |
| 20 hours | 0.8 kWh | £0.216 | £6.48 | £78.84 |
| 21 hours | 0.84 kWh | £0.227 | £6.80 | £82.78 |
| 22 hours | 0.88 kWh | £0.238 | £7.13 | £86.72 |
| 23 hours | 0.92 kWh | £0.248 | £7.45 | £90.67 |
| 24 hours | 0.96 kWh | £0.259 | £7.78 | £94.61 |
How we worked it out
- Energy per hour: 40 W ÷ 1,000 = 0.04 kWh
- Cost per hour: 0.04 kWh × £0.27 = £0.011
- Cost per day: × 8 hours = £0.086
- Month and year: × 30 days = £2.59, × 365 days = £31.54
What it costs in different places
Same 40-watt humidifier, 8 hours a day. Only the local electricity rate changes.
| Place | Rate per kWh | Cost per month |
|---|---|---|
| United States | $0.175 | $1.68 |
| California | $0.32 | $3.07 |
| Texas | $0.155 | $1.49 |
| New York | $0.25 | $2.40 |
| Florida | $0.155 | $1.49 |
| Illinois | $0.17 | $1.63 |
| Pennsylvania | $0.18 | $1.73 |
| Ohio | $0.17 | $1.63 |
| Washington | $0.115 | $1.10 |
About humidifier running costs
Ultrasonic humidifiers use very little power. Warm-mist and evaporative models use more because they heat water.
Typical sizes: 30 W, 40 W, 50 W, 200 W.
How to spend less: Pick a cool-mist ultrasonic model if cost matters most.
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 United Kingdom. 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.