How it works
Cost = watts/1000 × hours × tariff
Input definitions
- Power (W)
- Enter the value in the labeled unit.
- Hours of use
- Enter the value in the labeled unit.
- Cost per kWh
- Enter the value in the labeled unit.
A worked example
- Power (W)
- 1000
- Hours of use
- 3
- Cost per kWh
- 0.2
0.60
Assumptions & limits
Flat user-supplied tariff; excludes standing charges, tiers, demand charges and taxes.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-17. Content checked against the stated method and examples. Our verification approach.
Common questions
Should I order exactly the quantity shown?
Treat the result as a planning estimate. Check measurements, units, pack sizes, waste, openings and local requirements; the stated formula does not replace a project-specific design.
How does the Electricity cost tool work?
Cost = watts/1000 × hours × tariff.
What are the assumptions and limits of Electricity cost?
Flat user-supplied tariff; excludes standing charges, tiers, demand charges and taxes.