Sizu 
Usage-Cost Calculator
Units × rate + standing charge → the bill total, and your true cost per day.
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What this book teaches
How to read any utility bill and check it: the math of usage (units × rate + standing charge), estimated versus actual readings, comparing two or three tariffs honestly, spotting the overcharges and errors that slip through, and converting every billing cycle to a true annual cost so nothing hides.
Free tools for this book
True Annual Cost
Turn any monthly, quarterly, or weekly charge into its real yearly total.
Tariff Comparison
Two or three plans on the same usage — unit rate plus standing charge — for the real cheapest.
Estimated vs Actual
Meter readings against the estimate — over- or under-charged, in units and money.
Subscription Audit
Annualise every subscription and total the yearly bite the small charges add up to.
Fuel vs EV
Cost per mile for petrol vs electric, and the difference over a year’s mileage.
Bills Toolkit
All the book’s bill-check templates, gathered and sized to print. No sign-up.
All chapters
- 1Reading a Bill
- 2The Math of Usage
- 3Estimated vs Actual
- 4Comparing Tariffs & Plans
- 5Spotting Overcharges & Errors
- 6The True Annual Cost
- 7Putting It Together — The 5-Minute Bill Check
- ★Bonus — Fuel & EV Running Costs
- ★Bonus — The Subscription Audit