Electric Heater Running Cost Calculator
Hourly and monthly cost to run an electric heater.
Enter your values
Enter the heater wattage in W.
Enter the hours per day in hr.
Enter the electricity rate in $/kWh.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Cost per hour
- $0.24
- Daily energy use
- 7.5 kWh
- Estimated monthly cost
- $36
Quick answer
Electric heater running cost is its wattage converted to kilowatts, multiplied by hours used and your electricity rate.
cost = (watts/1000) x hours x rate
At a glance
| What it does | Hourly and monthly cost to run an electric heater. |
|---|---|
| Category | Home & DIY |
| Inputs needed | Heater wattage, Hours per day, Electricity rate |
| Main output | Cost per hour |
| Formula | cost = (watts/1000) x hours x rate |
| Cost | Free — no sign-up, no download |
How to use the Electric Heater Running Cost Calculator
- 1Check the wattage on the heater's label, commonly 1500W for portable space heaters.
- 2Estimate how many hours per day it runs.
- 3Enter your electricity rate from a recent utility bill to see the cost.
Inputs explained
- Heater wattage(W)
- Enter the heater wattage in W.
- Hours per day(hr)
- Enter the hours per day in hr.
- Electricity rate($/kWh)
- Enter the electricity rate in $/kWh.
Worked example
Using the values the calculator loads with:
Inputs
- Heater wattage1500 W
- Hours per day5 hr
- Electricity rate0.16 $/kWh
Results
- Cost per hour$0.24
- Daily energy use7.5 kWh
- Estimated monthly cost$36
Frequently asked questions
Are space heaters expensive to run?
A 1500W heater run 8 hrs/day at $0.16/kWh costs roughly $58/month, more in high-rate areas.
Is it cheaper than central heating?
It depends — heating one room with a space heater can be cheaper than heating a whole house, but not always.
What do I need to enter into the Electric Heater Running Cost Calculator?
Just 3 values: heater wattage, hours per day, electricity rate. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Electric Heater Running Cost Calculator work out the answer?
Electric heater running cost is its wattage converted to kilowatts, multiplied by hours used and your electricity rate. It applies the formula cost = (watts/1000) x hours x rate and shows the working so you can check each step by hand.
Is the Electric Heater Running Cost Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.