A SMALL TOOL WITH ONE JOB
About Wattledger.
Wattledger is a focused electricity-use calculator for one appliance or a set of identical devices.
It combines active and remaining-time input power with a repeating weekly schedule, your chosen active share and an entered usage tariff. The result separates the two energy contributions and makes a prorated estimate for your chosen number of days.
The tool does not identify appliances, retrieve current prices, interpret a bill or measure consumption. Its defaults are invented examples. Local text and CSV reports keep the arithmetic and assumptions together without an account.
Free to use
There is no subscription, checkout or account. The calculator is part of an independently operated collection of free planning tools. Each site focuses on one calculation so its assumptions stay easy to inspect.
How the tool is maintained
The calculation method is described in the worked guide. Automated checks cover conversion factors, example results and invalid inputs. A model can still miss a practical detail; use the guide to decide whether its assumptions fit your situation.
Corrections and questions
For a reproducible calculation problem or a privacy enquiry, use our shared portfolio contact. Include the inputs and expected result. No telephone call is needed.