Annual kWh from Meter Readings Calculator
Extrapolate annual energy and bill from two cumulative register readings and elapsed days.
A QUICK WALKTHROUGH
How to use this tool
- Extrapolate annual energy and bill from two cumulative register readings and elapsed days.
- Calculate the result.
- Copy the report or download it as TXT.
Formula and units
Delta = end − start; daily = delta ÷ days; annual kWh = daily × 365; annual bill = annual kWh × unit price + daily fee × 365.
Scope
Use the same cumulative register without rollover or reset. Readings and prices are nonnegative, end ≥ start, and days > 0. This assumes constant daily use, not a seasonal forecast. Prices and fees share your supplied currency; taxes and unlisted charges are excluded.
Local processing
Your entries stay in your browser. Copy and TXT export include the inputs, formula and scope.
GOOD TO KNOW
Common questions
How should I use the result?
Use it as an arithmetic estimate based on your supplied inputs.