Auto Liability Limits Calculator

State-minimum auto liability limits (often 25/50/25 — $25k per person bodily injury, $50k per accident, $25k property damage) are a financial trap for anyone with assets. A single at-fault accident with a broken femur can produce $180,000+ in medical bills; you're personally on the hook for anything over $25k. Your liability limits should cover your net worth plus roughly 2 years of income.

Real example. Homeowner, $450,000 net worth, $95,000 income. Current limits: 100/300/50. Calculator recommends BI $700,000 per person and PD $100,000 — a meaningful gap. Cost to raise BI from $100k to $500k is typically $150–$250 per year; cost to raise further to $1M with a $1M umbrella on top is another $250–$350 per year. For $400–$600 total, the family is now covered for a $2M+ lawsuit exposure that $100k limits wouldn't touch.

Add up: home equity, retirement accounts (creditor-protected in most states but not always — know your state), taxable investments, business ownership equity, and rental property equity. Add 2× annual income for future wages at risk. That's your minimum liability target. If the number exceeds $300k, carry an umbrella policy on top — you can't buy auto BI much above $500k from most carriers, so the umbrella fills the gap.

If you want to stress-test the answer, pair with auto insurance comparison calculator and umbrella insurance calculator — the two numbers should corroborate each other within ~15%. If they don't, one of your inputs is off.

Mistakes: running state minimums for years because they were the cheapest at age 22 and you never updated them; assuming your 401(k) is protected so you don't need high limits (IRAs past $1.5M are only partially ERISA-protected, and homes in many states have limited homestead exemption); forgetting that Uber/Lyft driving, delivery apps, or a part-time teaching gig can expose additional liability that personal auto won't cover.

Raising BI from 25/50 to 100/300 typically adds $35–$60/year. Raising 100/300 to 250/500 adds another $75–$130. Raising to 500/500 (if available) adds $100–$200. An umbrella of $1M costs $150–$350/year for most households. The marginal cost per $1,000 of coverage drops dramatically as you go up — liability limits are the highest-leverage line on a policy.

No-fault states (FL, MI, NY, NJ, PA, and others) use Personal Injury Protection (PIP) alongside BI liability; your BI kicks in for the other party's injuries beyond their PIP. California, Texas, Arizona (tort states) have higher typical BI claim amounts because litigation is easier — carry higher limits in these states.

Before you pull quotes, write a one-page spec: exact limits, exact deductible, exact riders, exact coverage period. Give all carriers the same spec. When quotes come back, ignore the headline premium and normalize — is the deductible identical, are the riders identical, is the liability limit identical? Only then compare.

Drop each carrier's real number back into this calculator to see the expected annual cost (premium + deductible × claim probability), not just the sticker. A $150 cheaper premium with a $750 higher deductible is usually worse once you account for probability. Pair with gap insurance calculator and commercial auto fleet calculator to confirm you're sizing limits correctly.

Rerun after any of: buying a house, paying off debt, a business equity event, or a 20%+ income jump. Pair with the umbrella calculator if recommended limits exceed $500k.

Calendar a reminder for 45 days before the renewal. Pull three fresh quotes — one from a direct writer (GEICO, Progressive), one from a captive agent (State Farm, Allstate, Farmers), and one from an independent agent who represents 8–12 carriers. Combine with coverage gap analyzer for your full portfolio view.

This tool is educational, not financial or insurance advice. Actual premiums depend on factors no web tool can perfectly model, including carrier-specific underwriting, state regulations, your individual history, and policy-form details. Formulas here use simplified national averages to get you within a reasonable planning range — not to produce a bindable quote. Before purchasing any auto liability limits policy, consult a licensed insurance agent in your state. Carrier links on this page are sponsored affiliate placements; we may earn a commission if you click and purchase, at no additional cost to you. This does not influence the calculator math or our editorial picks.

This calculator runs entirely in your browser using JavaScript. Nothing you type is transmitted to our servers. Nothing is stored after you close the tab. Use the Export PDF button to take the inputs and results with you. If you want a auto liability limits feature that doesn't exist yet, send a note via the contact page — we prioritize tool-building based on real user requests.