Auto insurance calculator

How auto insurance rates are calculated

Your auto insurance premium is not random. Every dollar of your rate can be traced back to a handful of well-defined risk factors. Insurers have spent decades analyzing claim data, and they charge you based on how closely you resemble people who have filed claims in the past. Understanding these factors puts you in a stronger position to shop smart.

1. Your state

Where you live is the single biggest factor. Michigan drivers pay an average of $2,900/year; Maine drivers pay around $1,020 — nearly a 3x difference for the same car and driver profile. State-level factors include minimum coverage requirements, lawsuit climate, medical cost environment, and the density of uninsured drivers. High-population urban states and states with severe weather exposure consistently rank among the most expensive.

2. Your age

Teenage drivers (16–19) pay 2–3x the rate of a 35-year-old with an identical record. This is not punitive — it reflects actuarial reality. Drivers under 25 have significantly higher accident rates per mile driven. Rates drop sharply through your mid-20s and stabilize through your 30s–50s before ticking up slightly after 65. The biggest single rate improvement most people experience is turning 25.

3. Your vehicle

Sports cars cost 30–50% more to insure than sedans. Electric vehicles carry a 10–15% premium due to higher repair costs. Minivans and economy sedans are among the cheapest to insure. Vehicle year also matters — newer cars cost more to repair but may qualify for safety discounts. A 10-year-old car is typically cheaper to insure than a 2-year-old model of the same type, even under full coverage.

4. Coverage level

Minimum liability coverage — just enough to be legal — costs roughly half what full coverage costs. Standard coverage sits in between. Full coverage includes collision and comprehensive, which pay for damage to your own vehicle. You can also tune your deductible — raising it from $500 to $1,000 typically cuts 10–15% off your premium.

5. Your driving record

A single at-fault accident raises rates by 30–50% on average, and the impact persists for 3–5 years depending on your state. A DUI can double your premium and trigger an SR-22 requirement. Multiple incidents can push you into the non-standard (high-risk) insurance market where rates are significantly higher. A clean record is worth protecting — consider the long-term insurance cost before making small claims.

6. Annual mileage

More miles means more exposure time on the road. Drivers logging 15,000+ miles per year pay a modest premium over average-mileage drivers. Low-mileage drivers (under 5,000 miles/year) can often qualify for specific low-mileage discounts. Telematics programs from Progressive, State Farm, and Allstate verify your actual mileage and reward low-mileage drivers more aggressively than manual reporting alone.

Use the calculator above to see how your specific combination of these factors compares to your state average. The breakdown chart shows exactly which factors are driving your estimated premium — and which ones offer the most room for savings.