Electricity Tariff Comparison Calculator
Compare two annual electricity costs and their usage intersection from your unit rates and daily fees.
A QUICK WALKTHROUGH
How to use this tool
- Enter common annual usage in kWh.
- Enter A and B unit rates, daily fees and one currency.
- Calculate annual costs, signed B−A difference and intersection, then copy or download the report.
Formula and units
Annual cost = usage × unit rate +365 × daily fee. B−A = annual B − annual A. Intersection usage =365(sB−sA)/(rA−rB).
Scope
A fixed365-day arithmetic year is used. Inputs exclude unspecified tax, discounts, tiers and other charges. The intersection may be zero or outside nonnegative usage. No supplier or tariff recommendation is made.
Local processing
Inputs stay in your browser. The report includes inputs, formulas and scope.
GOOD TO KNOW
Common questions
What if unit rates are equal?
Equal daily fees mean both cost lines are identical for all usage. Different daily fees mean parallel lines with no usage intersection.