Shopping for car insurance usually means collecting a handful of quotes that look similar on the surface, then guessing which one is actually the better deal. The trap is comparing monthly premiums only: a policy that costs $25 less every month can quietly charge you $500 more out of pocket the first time you file a claim. This car insurance comparison calculator from Smekys puts two quotes side by side and shows you both the savings and the breaking point — the exact claim frequency at which the cheaper premium stops being the cheaper policy.
Enter the monthly premium and deductible for each quote. The calculator instantly shows the annual premium of both plans, your monthly and annual savings, the break-even claim frequency, and — once you add your own expected claim rate — which policy wins for your driving history.
How to Use
- Enter Policy A — Monthly Premium and Policy A — Deductible for your first quote. The deductible is the amount you pay toward each claim before the insurer starts paying.
- Enter Policy B — Monthly Premium and Policy B — Deductible for the second quote you are weighing. Compare quotes that cover the same vehicle, drivers, and coverage limits, or the result will mislead you.
- Leave Expected Claims per Year at 0 if you simply want the headline premium difference. Set it to your honest estimate instead — 0.2 means roughly one claim every five years, 0.5 means one claim every two years, and 1.0 means a claim every single year.
- Read the result card top to bottom: the two annual premiums, the Annual Savings figure, the Break-Even Claim Frequency, and the Recommended Policy line.
- Interpret the break-even number like this: if your true claim rate is below it, the lower-premium, higher-deductible plan wins; if you expect to file claims more often than that, the higher-premium, lower-deductible plan protects you better.
How the Break-Even Math Works
The total expected cost of a policy in a year is its annual premium plus the expected cost of claims. Because a deductible resets for every claim, expected claim cost equals claim frequency multiplied by the deductible:
Annual cost = annual premium + (claims per year) × deductible
To find the claim frequency at which Policy A and Policy B cost the same, set their annual costs equal and solve:
f = (PremiumA × 12 − PremiumB × 12) / (DeductibleB − DeductibleA)
Worked example on the defaults: Policy A is $120 per month with a $500 deductible; Policy B is $95 per month with a $1,000 deductible. Annual premiums are $1,440 and $1,140 — a $300 annual gap. The deductible gap is $500. So f = $300 / $500 = 0.6 claims per year, or roughly one claim every 1.67 years.
What that means in plain English: if you file a claim less often than about once every 20 months, Policy B wins hands down and you pocket the $300 every year. But if you expect a claim more often than that — say, three at-fault incidents in five years — Policy A's lower deductible starts paying for itself, and its higher premium was worth it. Most drivers with clean records sit well below 0.6 claims per year, which is exactly why insurers push higher deductibles: they win statistically, while you lose only in the unlucky years.
Examples
Example 1 — The default comparison. Policy A: $120/month, $500 deductible. Policy B: $95/month, $1,000 deductible. Annual premiums $1,440 vs $1,140; annual savings $300; break-even 0.6 claims/year. A clean-history driver saves $25 every month, or $300 a year, and only starts losing money if a claim happens more often than once every ~20 months.
Example 2 — A nervous driver. Same two quotes, but this driver sets Expected Claims per Year to 1.0 (one claim a year). Expected annual cost for A: $1,440 + 1.0 × $500 = $1,940. For B: $1,140 + 1.0 × $1,000 = $2,140. Suddenly Policy A is $200 cheaper per year — the higher premium buys a lower deductible that pays off when claims are frequent.
Example 3 — Large numbers, same logic. Two commercial-style premium quotes: A at $100,000/month with a $500,000 deductible, B at $95,000/month with a $2,000,000 deductible. Annual savings are $60,000, but the break-even frequency is just 0.04 claims/year — a claim roughly once every 25 years. That is an extremely thin margin: one at-fault accident in a decade wipes out the entire premium advantage and then some.
FAQ
Is a higher deductible always cheaper?
No. A higher deductible lowers your premium, but it raises what you pay per claim. This calculator finds the crossover: the break-even claim frequency. If you file claims less often than that number, the higher deductible saves you money; if you file more often, the lower deductible was worth the extra premium.
How much can I save by choosing the lower-premium policy?
In the default example — $120/month with a $500 deductible versus $95/month with a $1,000 deductible — you save $25 each month, or $300 per year, as long as you stay below about 0.6 claims per year. On a six-year policy cycle that is roughly $1,800 of savings for a clean driving record.
How do I estimate my expected claims per year?
Look at your own record: count at-fault accidents and comprehensive claims over the past five years, divide by five, and round to one decimal place. A driver with one claim in five years is at 0.2. If your record is clean, use 0.1–0.2. Never base it on what might happen — base it on what has happened.
What is a break-even claim frequency of 0.6?
It means Policy B becomes more expensive than Policy A once you average more than 0.6 claims per year — about one claim every 20 months. Below that rate, the lower premium wins; above it, the lower deductible wins. The calculator also reports the inverse (years per claim) so you can read it as "one claim every X years."
Should I raise my deductible to save on premium?
If your emergency fund can cover the deductible without going into debt, and your claim history sits below the break-even rate shown here, raising the deductible is usually a smart move. If a $1,000 out-of-pocket surprise would break your budget, keep the lower deductible even though it costs more each month.
Do other coverage factors matter besides premium and deductible?
Yes. Compare only quotes with identical liability limits, comprehensive and collision coverage, uninsured-motorist coverage, and roadside-assistance options. A cheaper quote that strips coverage is not actually cheaper — this calculator assumes the coverage itself is equivalent across the two policies.
Why does the savings number turn negative?
A negative annual savings means Policy B's monthly premium is actually higher than Policy A's, so there is no premium saving to capture at all. In that case the calculator recommends whichever plan has the lower expected annual cost given your claim rate.
Disclaimer
This Car Insurance Comparison Calculator from Smekys is provided for informational purposes only and does not constitute insurance, financial, legal, or tax advice. All figures are estimates based on the premium and deductible inputs you enter; actual rates, coverage terms, claim handling, and discounts vary by insurer, vehicle, location, driving record, and state regulations. The break-even model assumes a fixed deductible per claim and does not account for multi-claim annual limits, policy surcharges after accidents, or coverage differences. Always compare full policy documents and consult a licensed insurance agent or broker before purchasing or changing coverage.