Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Unit Converters
Cost of Appliance Running Time Calculator
cost = (W × hours / 1,000) × rate.
Cost = watts × hours / 1000 × $/kWh. A 1,500 W space heater for 4 hours at $0.16/kWh is $0.96. The supply rate on the bill is the one that matters, not a national average.
Watts
W → $
$0.96
Use the supply rate on your bill, not the first Google result for your city.
- kWh
- 6
- Rate
- $0.16 /kWh
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Watts
The “Watts” value used in this tool’s formula. Adjust it to see results update live.
Hours
The “Hours” value used in this tool’s formula. Adjust it to see results update live.
Rate ($/kWh)
The “Rate ($/kWh)” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
Cost = watts × hours / 1000 × $/kWh. A 1,500 W space heater for 4 hours at $0.16/kWh is $0.96. The supply rate on the bill is the one that matters, not a national average. cost = (W × hours / 1,000) × rate. Example: 1500 W × 4 h × $0.16 → $0.96. 10 W USB charger × 8 h → about a penny.
cost = (W × hours / 1,000) × rate.
Example: 1500 W × 4 h × $0.16 → $0.96. 10 W USB charger × 8 h → about a penny.
When to use this Appliance Running Cost
Common use cases
- Cost = watts × hours / 1000 × $/kWh. A 1,500 W space heater for 4 hours at $0.16/kWh is $0.96. The supply rate on the bill is the one that matters, not a national average.
- Sanity-check with this case: 1500 W × 4 h × $0.16 → $0.96. 10 W USB charger × 8 h → about a penny.
- The relationship is: cost = (W × hours / 1,000) × rate.
Localized examples
- Unit Converters: the example on this page uses the same formula as the widget.
What you get
- Fields: Watts, Hours, Rate ($/kWh)
- cost = (W × hours / 1,000) × rate.
- Example on the page: 1500 W × 4 h × $0.16 → $0.96. 10 W USB charger × 8 h → about a penny.
How to Convert Appliance Running Cost Step-by-Step
- 1Enter Watts, Hours, Rate ($/kWh). Use the values you have, not a catalog average, unless that is all you know.
- 2cost = (W × hours / 1,000) × rate.
- 3Worked case: 1500 W × 4 h × $0.16 → $0.96. 10 W USB charger × 8 h → about a penny.
- 4Check which dictionary the other person is using — US or UK, decimal or 1,024 — then trust the number.
Governing formula
cost = (W × hours / 1,000) × rate.
1500 W × 4 h × $0.16 → $0.96. 10 W USB charger × 8 h → about a penny.
Example: set Watts = 1,500, Hours = 4, Rate ($/kWh) = 0.16, then read the result.
Variable definitions
- value
Watts
The “Watts” field. Default 1500; typical range 0–10000.
- hours
Hours
The “Hours” field. Default 4; typical range 0–24.
- rate
Rate ($/kWh)
The “Rate ($/kWh)” field. Default 0.16; typical range 0.01–1.
- The conversion (cost = (W × hours / 1,000) × rate.) does not pick US vs UK gallons, SI vs binary megabytes, or Mach at altitude for you. Read the footnote on the page.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
Use the peak rate if this runs at 6 pm.
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Community
Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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