Car Insurance Cost Per Month: Calculator and State Averages

On the 2022/2023 Auto Insurance Database Report (2023 data year), the average insured vehicle cost $107 a month. A policy carrying liability, collision and comprehensive averaged $120 a month countrywide, and the liability portion alone $61. Across the states, a policy with all three coverages ranges from $77 a month in Maine to $166 in Florida. These are averages across every driver, vehicle and limit written in the state, not quotes, and the NAIC series runs about two years behind, so premiums quoted today sit above these levels. Your own premium depends on age, ZIP code, vehicle, driving record, credit-based insurance score where legal, and coverage choices.

Insurers calculate your premium from actuarial loss data across five primary factors: (1) your age and driving experience, (2) your state and ZIP code, (3) your vehicle type, make, and model, (4) your coverage tier and deductible, and (5) your driving and claims history. In most states, your credit-based insurance score also affects your rate; this is banned in California, Hawaii, Massachusetts, and Michigan. Our calculator anchors on the measured NAIC state average for the coverage you pick, then applies modelled age and vehicle adjustments that are labelled as modelled on the methodology page. See /methodology for the full formula.

Car insurance costs surged 20-30% over 2022-2025 due to several compounding factors. Vehicle repair costs rose sharply as chip shortages drove up parts prices and EV repair complexity increased. Medical inflation drove up bodily-injury claim severity. More severe weather events (hail, flooding, wildfires) drove up comprehensive claims. More uninsured drivers in some states increased the UM/UIM cost spread across all policyholders. Rates have begun stabilising in 2026 in most states as carriers have filed rate increases that now reflect actual loss costs. The NAIC reports the countrywide average expenditure rose 13.99 percent in 2023 alone and 19.24 percent over the five years to 2023.

For new drivers (under 3 years of driving experience), yes -- significantly. Insurers apply an inexperienced-driver surcharge at policy inception that unwinds over three years of clean continuous coverage. At the first renewal (month 12), most carriers step the rate down 8-15%. At the second renewal (month 24), another 8-15% step-down. At the third renewal (month 36), the surcharge is fully unwound. See the full 36-month progression chart at /new-driver-progression. For experienced drivers, your rate is driven more by claims, credit, ZIP code, carrier filing changes, and vehicle changes than by tenure.

On the NAIC measure of what the average insured vehicle actually costs, North Dakota is cheapest at $67 a month, with Maine ($71) and Idaho ($72) next. Low-cost states share common traits: low population density, low uninsured-driver rates, low litigation frequency, and no severe-weather concentration. New Hampshire is unique: it does not require drivers to carry auto insurance (only financial responsibility proof), which reduces mandatory market pricing pressure.

On the NAIC measure, Florida is the most expensive at $155 a month per insured vehicle, with Louisiana ($146) and New York ($146) behind it. Florida's costs reflect the combination of hurricane-related comprehensive claims, a historically fraud-prone PIP no-fault system, and a very high uninsured-driver rate of approximately 20%.

Countrywide, a policy carrying liability, collision and comprehensive averages $120 a month against $61 for the liability portion alone, a difference of $59 a month. The gap is not a fixed multiple: it runs from $42 a month to $78 depending on the state. Whether full coverage is worth the cost depends on your vehicle value: the general rule is to carry full coverage when your vehicle is worth more than 10 times the annual collision and comprehensive premium. See /coverage-tiers for a calculator.

The most impactful levers: (1) Raise your deductible from $500 to $1,000 -- typically saves $5-30 per month; park the difference in a high-yield savings account. (2) Shop and compare quotes at every renewal -- rates vary 30-50% between carriers for identical coverage. (3) Bundle with renters or homeowners -- saves 5-25% at most carriers. (4) Enroll in telematics or usage-based insurance (Root, Progressive Snapshot, Allstate Drivewise) if you drive safely and infrequently -- saves 10-30%. (5) Ask about every discount: good student, defensive driving course, military, paperless, paid-in-full (5-12% savings). (6) Drop collision and comprehensive on a vehicle worth less than 10x the annual premium for those coverages.

Paying in full annually typically saves 5-12% over monthly installments. Carriers waive the installment fee (often $2-8 per month) and many offer a paid-in-full discount on top. On a $200 per month policy, that is $120-288 saved per year. The catch is you need $1,200 or more up front. One strategy: save monthly into a high-yield savings account (current rates 4-5% APY in 2026) and pay annually when the balance reaches the annual premium. You keep the interest and save the installment fee. See yearlysalarycalculator.com for a budget allocator.

In most states, yes -- insurers use a credit-based insurance score (distinct from your FICO score) to predict claim likelihood. A poor credit-based score can add 20-100% to your premium in states where it is legal. Four states explicitly ban the practice: California, Hawaii, Massachusetts, and Michigan. In those states, insurers must price on driving record, age, and vehicle data alone. If you are in a credit-scoring state, improving your credit-based score over 12-24 months can generate meaningful premium savings at renewal.

The numbers are bodily-injury-per-person / bodily-injury-per-accident / property-damage-per-accident, in thousands of dollars. 25/50/25 is a common state-minimum level: it covers up to $25,000 per injured person, $50,000 total per accident, and $25,000 in property damage. 100/300/100 is a robust full-coverage tier: $100K per person, $300K per accident, $100K property. The gap matters most in moderate-to-severe injury claims. A $75,000 bodily injury claim leaves a 25/50/25 policyholder personally liable for $50,000. A 100/300/100 policyholder has full coverage. See /coverage-tiers for the math at your inputs.

Industry guides put the renewal increase after a single at-fault accident at roughly 40 percent, though the NAIC series does not measure surcharges and this is not a figure we can verify from official filings. The surcharge typically persists for 3-5 years depending on the carrier. Some carriers offer accident forgiveness on the first incident (Progressive, Geico, and others) -- check your policy before an accident, not after. A not-at-fault accident generally does not affect your rate, though some states allow a minor increase if you have a pattern of not-at-fault claims. A DUI raises premiums 50-100% and typically requires an SR-22 filing in most states for 3 years.