Summarize recent repair spending and calculate an annualized rate over the period you choose.
Repair History Cost Calculator
Formula
Annualized repair spend = repair spend ÷ measured months × 12
How to use the result
Past spending can reveal a pattern but does not prove a future failure rate. Avoid letting sunk cost alone determine the next decision.
What the calculator does not know
This site does not diagnose faults or provide repair instructions. Stop using items that may be unsafe, recalled, electrically hazardous, fire-damaged, structurally compromised, leaking dangerous substances or otherwise safety-critical, and follow manufacturer, recall-authority and qualified service-professional guidance.
Improve the estimate
Keep the inputs used for the decision and compare the estimate with actual results. A simple calculator is most useful when it makes the assumptions visible enough to learn from the difference.