Content traffic decay
- Input
- 1,000 visits, 12% decay rate, 3 periods
- Result
- 681 visits remaining
- Action
- Refresh before the page loses another cycle of traffic.
Measure time-based loss
Decay Calculator
Calculate remaining value, lost value, and percentage left for anything that decays, fades, expires, or loses value over time.
Calculate how much value remains after repeated time-based loss.
Remaining value681.47
Lost value318.53
Remaining68.1%
Scoring logic
Discrete decay formula
Remaining value = initial value x (1 - decay rate) ^ time. Lost value = initial value - remaining value.
Initial value
The starting amount.
Decay rate
The percentage lost each period.
Time
The number of periods that passed.
Sample results
Asset value decay
- Input
- $5,000 value, 15% annual decay, 2 years
- Result
- $3,612 remaining
- Action
- Compare remaining value with repair or replacement cost.
Habit momentum decay
- Input
- 100% habit strength, 20% weekly decay, 2 weeks missed
- Result
- 64% remaining
- Action
- Restart with a smaller commitment before the habit fully fades.
What to do next
Use the result to compare how fast different things lose value, then decide what to refresh, fix, review, or let go.
Action playbook
- Use the calculator to compare multiple decay scenarios.
- Act earlier when the next period of loss is expensive.
- Pair the result with a refresh, fix, review, or retire decision.
Common use cases
Model traffic loss.
Estimate value decay.
Explain time-based loss with a simple formula.
FAQ
Is this an exact result?
The tools provide practical estimates. Use them for planning, comparison, and prioritization.
Why does Decay.day group these tools together?
Each tool measures a form of value loss over time, then helps you decide what to refresh, fix, review, or retire.
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