Auto Insurance Coverage Needs Calculator
Calculate the auto-insurance liability limits and add-on coverages you actually need. State minimums (often 25/50/25) are dangerously low — a serious accident easily exceeds $300K in damages. Coverage targets adjust to your net worth, household-driver risk, and umbrella-policy bridge requirements.
Why State Minimums Are Inadequate
Most states require only 25/50/25 (= $25K bodily injury per person / $50K per accident / $25K property damage). A single ER visit averages $3,500; a fractured leg surgery $30K-$50K; a severe injury requiring hospitalization $100K-$500K. Hitting a Tesla Model S costs $80K in property damage alone. State minimums get you arrested-free for driving but leave your personal assets exposed. Lawsuit risk is real.
Coverage Tiers by Net Worth
Under $100K net worth: 100/300/100 minimum. $100K-$500K: 250/500/100. $500K-$1M: 500/500/100 or 250/500/250 + $1M umbrella. $1M-$5M: 500/500/100 + $1-3M umbrella. $5M+: 500/500/100 + $5M+ umbrella with primary auto/home policies at insurer's preferred 'umbrella underlying' levels. Carriers typically require 250/500 underlying for umbrella issuance.
UM/UIM — Uninsured/Underinsured Motorist
Roughly 12.6% of US drivers carry no insurance (Insurance Research Council 2024); another 15% carry only state minimums. If you're hit by them, your own UM/UIM coverage pays your medical/lost-wages — but only up to your UM/UIM limit. Match UM/UIM limits to liability limits (e.g. 250/500/100 liability → 250/500 UM/UIM). UM/UIM is one of the most under-purchased coverages, despite being cheap. Critical in low-coverage states (FL, CA, NM, TN, KY all >18% uninsured).
Add-On Coverages Worth Buying
(1) Medical Payments / PIP: $5K-$10K. Pays your medical bills regardless of fault. Cheap. (2) Comprehensive + Collision: required for car loans, optional once paid off; consider dropping when vehicle value < 10× annual premium. (3) Rental Reimbursement: $30-$50/day for 30 days. (4) Roadside assistance: cheaper than AAA. (5) Original Equipment Manufacturer (OEM) endorsement: ensures repair shop uses OEM parts not aftermarket. (6) New-car replacement: replaces totaled new car with same model. (7) Gap insurance: required if loan balance > car value.
Auto Insurance Coverage Needs Calculator — How NAIC State Reports Set the Realistic Floor
State-mandated minimums are a legal floor, not a financial-protection floor. Per the NAIC Center for Insurance Policy and Research auto insurance topic, the national average bodily injury claim has risen above $24,000 and property-damage claims average $5,800 (NAIC 2024 closed-claim data) — meaning the popular 25/50/25 state minimum will exhaust on a single moderate accident. Use this calculator with two passes: first at your state's legal minimum (to see how exposed you are), then at the 100/300/100 baseline most underwriters consider "adequate". The premium difference is typically $15-$40/month — a fraction of what one uncovered $150,000 medical-bill lawsuit would cost. If your net worth crosses $250,000, also price a $1M personal-umbrella policy ($150-$300/year typical); without one, an at-fault accident judgment can reach your home equity and retirement accounts in many states.
Sources: NAIC Center for Insurance Policy & Research, Insurance Information Institute (III). Last updated: 2026-06-14.
Frequently Asked Questions
What auto insurance limits should I have?
Net worth tiers: <$100K = 100/300/100; $100K-$500K = 250/500/100; $500K-$1M = 250/500/250 + $1M umbrella; $1M+ = 500/500/100 + $1-5M umbrella. State minimums (often 25/50/25) leave personal assets exposed in serious accidents.
What is UM/UIM and do I need it?
Uninsured/Underinsured Motorist coverage — pays your medical bills and damages when hit by a driver with no insurance or insufficient limits. ~13% of US drivers carry no insurance. Match UM/UIM to your liability limit. Especially important in high-uninsured states (FL, CA, NM, TN, KY).
Do I need an umbrella policy?
If net worth > $500K, yes — primary auto + home liability rarely exceeds $500K, and a serious accident judgment can easily exceed that. Umbrella adds $1M-$10M at $200-$400/year per million. Insurer typically requires 250/500 auto + $300K home liability underlying.
Can I drop comprehensive and collision coverage?
Yes, when the vehicle's market value drops below 10× your annual comp+collision premium. Example: paying $1,200/year for comp+coll on a vehicle now worth $5,000 — drop it (you're paying 24% of vehicle value to insure). Keep liability and UM/UIM regardless of car value.
What is gap insurance?
Pays the difference between your car loan balance and the insurance settlement if the vehicle is totaled. Required when loan balance exceeds vehicle's depreciated value (common in first 2-3 years of a new-car loan, especially with low down payment). Average cost $50-$200/year.
Auto insurance coverage needs calculator — should I match my state's minimum or buy higher?
Always buy higher. NAIC closed-claim data show average bodily-injury claims now exceed $24,000 and property-damage claims average $5,800. A state minimum of 25/50/25 exhausts on one moderate accident, after which the at-fault driver's personal assets are exposed. The 100/300/100 baseline costs $15-$40/month more in most states — a small premium relative to even one uncovered $150,000 medical lawsuit.
When should I add an umbrella policy on top of these auto limits?
When your net worth crosses ~$250,000 (or you own a home with significant equity). Primary auto + home liability together rarely exceed $500,000, and a serious at-fault accident judgment can run multi-million. A $1M personal-umbrella policy typically runs $150-$300/year. The insurer usually requires 250/500/100 auto + $300K homeowner liability as underlying before issuing umbrella.