Interactive · Full-coverage math
Should I drop full coverage?
Enter the car’s value and the yearly cost of collision plus comprehensive. We check the common 10% signal, flag anything a lender would block, and give you a plain verdict.
THE SHORT ANSWER
Compare the yearly cost of full coverage to the most you could ever recover (car value minus deductible). As that ratio approaches 10%, full coverage stops carrying its weight. If the car is on a loan or a lease, the lender almost always requires it anyway.
Enter the three numbers
This is an estimate, not a quote. The calculator does arithmetic on the numbers you enter; actual rates depend on carrier underwriting.
How we calculate this
Two pieces of arithmetic, one hard rule.
max_payout = car_value − deductible cost_to_value_pct = (yearly_collision_plus_comp ÷ max_payout) × 100 years_to_car_val = car_value ÷ yearly_collision_plus_comp
The hard rule: if the car is on a loan or a lease, the tool returns a hard stop and does not compute a cost-to-value verdict at all. Lender-required full coverage is a contract term, not a risk-tolerance question.
Otherwise, the verdict chip picks from three bands:
Every sentence in the result references computed numbers (your yearly cost, your max payout, your ratio, your years-to-car-value) rather than fixed prose, so switching inputs always leaves the explanation consistent with the headline.
Common questions
What is the 10% signal?
It is a widely-used shopping heuristic (described on our full-coverage page as one of four signs to drop collision and comprehensive) that compares your yearly collision + comprehensive premium to the maximum amount you could ever recover (the car’s current value minus the deductible). When that ratio approaches 10% or higher, full coverage has stopped carrying its weight on an older vehicle. Combined with a healthy emergency fund, that is when many consumer guides suggest dropping to liability only.
Why does the loan or lease question force a hard stop?
Almost every auto loan contract and every lease agreement requires physical-damage coverage (collision and comprehensive) until the car is paid off or the lease ends. Dropping it unilaterally typically triggers lender-placed insurance, which is more expensive than the policy you had and comes with late fees on top. The honest answer there is: finish the loan, then come back and run the numbers.
What value should I enter — Kelley Blue Book, trade-in, or private party?
Use what a reasonable buyer would actually pay today. Kelley Blue Book private-party or NADA clean-trade-in values are both honest reference points. Avoid MSRP; the carrier never pays MSRP.
Do I need to split my premium into collision and comprehensive?
Your declarations page shows each coverage line and its yearly premium. Add the collision line and the comprehensive line; do not use your total premium (that includes liability, UM, PIP, and anything else you have).
Does dropping full coverage save money immediately?
Yes. Carriers prorate the refund of the dropped lines back to you, and your new rate is lower on the next renewal cycle. If you have a mid-term change, ask the carrier to issue the refund rather than apply it to future premiums.
Sources
- Full coverage car insurance (10% signal in context) (YesWeSure)
- When to drop collision and comprehensive (YesWeSure)
- What is covered by a basic auto insurance policy? (Insurance Information Institute)
Last reviewed October 24, 2026.