The bill says estimated, estimate, actual read, true-up, corrected read, or adjustment near the meter reading section.
An estimated read can shift usage between months. One bill may look too low, then the next actual read catches up and looks unusually high even when household habits did not change much.
Check first
Find whether the prior bill or current bill used an estimated read.
Compare meter readings, read dates, and billing days.
Separate catch-up usage from rate changes and fixed fees.
Check whether the next actual read corrected a low estimate.
Practical savings moves
Use meter-read math before changing appliance or water routines.
Submit customer readings if your utility allows it.
Track daily kWh or gallons after the true-up period ends.
Use the adjustment calculator to isolate the estimated-read effect.
Avoid these mistakes
Do not assume a true-up means the whole home suddenly used more.
Do not compare an estimated month with an actual month by dollars only.
Do not ignore billing days when a corrected read covers a longer period.