Car Insurance Estimator

Insurers rate a car policy on dozens of variables, and the exact weights are proprietary. But four of them do most of the work, and those four are the ones you can actually change: how old you are, what you drive, what your record looks like, and how much coverage you buy. That is what this page models.

What this page computes: Annual Premium = Coverage Base Rate × Age Factor × Record Factor × Vehicle Value Factor

Coverage sets the base rate rather than acting as a separate multiplier, and there is no discount term, because discounts are applied by the carrier after rating and vary far more than the factors below.

What this calculator uses. Every figure below is the exact multiplier applied, so you can reproduce any result by hand:

Each one sits mid-band rather than at an extreme, because the extremes belong to specific states and carriers. A DUI in California is closer to the 3.5× end; in a state that caps surcharges it can be nearer 2.0×.

If you also run the auto insurance estimate calculator, expect a different number, and here is why. That page sits low in these same ranges where this one sits mid: it uses 1.80× for a driver under 20 against 2.20× here, and 1.75× for a DUI against 2.40×. On a clean 45-year-old the two land within about 10% of each other. On a 19-year-old with a DUI they are roughly 50% apart, because two of the largest multipliers on the page differ at once. Neither is wrong. It is a real spread in the market, and no benchmark can be right for every state and carrier at once. The fix is on both pages: enter your own current annual rate in the optional base-rate field. Everything rescales to your insurer, the two pages then agree, and the comparison between coverage levels becomes worth something.

Vehicle value only moves two of the three coverage types. Collision and comprehensive pay to repair or replace your car, so a $90,000 car costs more to cover than a $9,000 one. Liability pays for the other driver’s car and property, and it does not care what sits in your driveway. Selecting liability-only here will show the value factor as “no change”, which is correct and is the single most common thing calculators of this kind get wrong.

Factors this calculator does not model, and you should expect them to move a real quote:

• Credit score, in the roughly 40 US states that permit credit-based rating. Excellent to poor is close to a 2× spread on its own, which is larger than anything above.
• ZIP code. Not state, ZIP. Two neighborhoods in one city can differ 20%.
• Annual mileage, safety rating, theft rate for that specific model, and repair-cost index. A Honda Civic is stolen far more often than its price suggests, and European luxury brands carry collision costs well above their MSRP band.

What sits inside each of the three base rates:

That last tier is labeled “comprehensive” on the dropdown but it is really a full-coverage package, which is why the jump from $1,100 is larger than comprehensive alone would cost. Comprehensive by itself is usually the cheapest thing on a policy, often under $300 a year, and it is the one people drop first and regret after a hailstorm.

Discounts are not modeled here. Bundling, multi-car, good student, telematics, paying in full, and a defensive driving course stack to 25% or more between them, and they are applied after rating. If you want them in the estimate, the auto insurance estimate calculator takes them as an input, along with your vehicle class and whether you live rural, suburban, or urban.

Worked example. A 28-year-old with a clean record drives a 2021 Honda Accord worth $25,000, and wants full coverage.

• Full-coverage base rate: $1,700/year
• Vehicle value factor: 1 + ($25,000 ÷ $100,000) × 0.5 = 1.125×
• Age 28: 1.00×  ·  Clean record: 1.00×
• $1,700 × 1.125 × 1.00 × 1.00 = $1,912.50/year, or $159.38/month

Change one thing and watch it move. The same driver at 22 pays $3,060 a year, because the young-driver factor multiplies everything by 1.60. Add a DUI, the heaviest single factor on the page at 2.40×, and it is $7,344. Those two changes alone cost $5,431.50 a year more than the clean 28-year-old profile above.

About that base rate. The $650 liability, $1,100 collision, and $1,700 full-coverage figures are US averages, and averages age badly. Premiums rose sharply through 2023 and 2024 on repair costs alone. If you already have a policy, put your current liability-only rate in the optional base-rate box and everything above rescales to your carrier and your state. That is the single change that makes this estimate worth more than a national average.

Shopping 3–5 quotes typically yields a 15–35% lower rate than taking the first one, which is a bigger swing than most of the factors in the table above.