Understanding Lapse Rate
How we calculate. Lapse % = lapses ÷ in-force (or renewals due) × 100. See our methodology and accuracy policy .
Real-world scenario: A typical Lapse Rate case uses lapsed policies 120 and base policies 1000. Enter the same figures below to reproduce the worked path.
What is Lapse Rate?
A persistency risk KPI. When the base is renewals due, lapse often complements retention (100% − retention) if definitions match.
- Label the base (in force vs due)
- Same product cohort
- Pairs with retention ratio
The Formula
Worked Example
Common Use Cases
- Persistency monitoring: book runoff
- Pricing actions: shock lapse
- Agency quality: involuntary vs voluntary lapse
Pro Tips
- Separate non-pay vs insured-initiated
- Exclude mid-term rewrites if SOP says so
- Align with retention cohort
| Scenario | When to use |
|---|---|
| Percent of a number | Finding a part of a whole (tax, tip, score) |
| Percent change | Comparing old vs new values |
Limitations: Lapse Rate results are educational insurance and agency planning aids—not underwriting, actuarial, claims, or financial advice. Confirm statutory definitions with your carrier, regulator, and finance teams.
Common mistakes
- Swapping part and whole: The denominator must be the full total, not a subset.
- Rounding too early: Carry extra decimal places through multi-step work before rounding the final percent.
- Mixing percent and decimal forms: Enter rates in the format the calculator labels expect.
The worked example for lapse rate was verified with the calculator form on this page—enter the same values to confirm the result.
When to use this calculator
- Use this page when your wording matches lapse rate and the form labels on screen.
- Use percent of a number for “what is X% of Y?” problems.
- Use number is what percent when you know part and whole and need the percent.
Still unsure about lapse rate? Start with the quick answer above, then open the linked calculator that matches your wording.
❓ Frequently Asked Questions
How do I use this lapse rate calculator?
For lapse rate, enter the values labeled on the form, then press Calculate. Compare the result to the worked example on this page.
What formula does this page use?
See the quick answer and formula box above for lapse rate—the same percentage calculator expression is applied to your inputs.
What if my result looks wrong?
When checking lapse rate, re-check part vs whole (or rate vs base), rounding, and whether percents were entered as 25 rather than 0.25 when the form expects percents.
Authoritative References
For insurance ratio and reporting concepts, consult:
- NAIC — U.S. insurance regulatory resources
- Casualty Actuarial Society — actuarial education resources
- Insurance Information Institute — industry explainers