This free comparative negligence settlement calculator shows how your own percentage of fault reduces your settlement. In a pure comparative-negligence state, your recovery equals your full claim value multiplied by (100% − your fault %) — so a $100,000 claim with 25% fault pays $75,000. The calculator also models the stricter rules used in many states: a modified 50% or 51% bar (you recover nothing if your fault reaches the bar) and pure contributory negligence (any fault at all, even 1%, bars recovery). Enter your estimated full claim value, your fault percentage, and your state's rule to see your fault-reduced recovery instantly.
Comparative negligence is the legal doctrine that splits responsibility when more than one party contributed to an accident. Almost every state reduces a settlement by the injured person's share of fault — the difference is only in how, and whether crossing a threshold wipes out recovery entirely. Below the calculator, this page explains pure vs. modified comparative negligence, the rare contributory-negligence states, how insurers use fault to cut offers, and how the reduction interacts with attorney fees and liens. This is educational information, not legal advice; every case differs.
The calculator performs the exact arithmetic an adjuster or attorney uses to apply fault. The core formula is simple:
Recovery = Full Claim Value × (1 − Your Fault %)
That formula applies directly in a pure comparative-negligence state. In a modified state, the same formula applies until your fault reaches the bar (50% or 51%), at which point recovery drops to zero. In a pure contributory-negligence state, any fault at all bars recovery. The calculator checks your selected rule against your fault percentage, applies the bar if triggered, and reports your fault-reduced recovery, the dollar reduction, and a warning if the rule bars you. Enter the full claim value (medical bills, lost wages, and pain and suffering before any fault reduction) for the most accurate result.
Under pure comparative negligence, you can recover damages no matter how much you are at fault — your award is simply reduced by your percentage. Even a plaintiff who is 90% at fault can recover 10% of their damages. A handful of states, including California (which adopted the rule in the landmark case Li v. Yellow Cab) and New York and Florida among others, follow the pure rule. It is the most plaintiff-friendly approach because crossing any threshold never eliminates the claim; it only shrinks it. In the calculator, selecting “pure” applies the reduction at every fault level without a bar.
Most states use modified comparative negligence, which works like the pure rule but cuts off recovery at a threshold. Under the 50% bar (the “not as great as” rule), you recover only if your fault is less than 50% — at exactly 50% you recover nothing. Under the 51% bar (the “no greater than” rule), you recover if your fault is 50% or less and are barred only at 51% or more. The practical effect: in a 50%-bar state, a plaintiff found equally at fault gets zero, while in a 51%-bar state that same plaintiff recovers half. Because the threshold decides everything near the midpoint, fault disputes around 50% are fiercely contested.
A small number of jurisdictions still follow pure contributory negligence, the harshest rule of all: if the injured person is even 1% at fault, they recover nothing. Alabama, Maryland, North Carolina, Virginia, and the District of Columbia are the traditional contributory-negligence jurisdictions. In these places, the defense fights to pin any sliver of fault on the plaintiff because a single percentage point defeats the entire claim. Some of these jurisdictions soften the rule with doctrines like “last clear chance,” but the baseline is severe, and it makes clear liability evidence essential. The calculator's “contributory” option returns $0 for any fault above zero.
Comparative fault is one of an adjuster's most powerful tools to reduce a payout. Even where liability seems clear, an insurer will often assert that you bear some percentage — you were speeding slightly, not paying full attention, or could have avoided the collision — because every percentage point of fault assigned to you directly lowers what they must pay. In a $100,000 claim, convincing you to accept 30% fault saves the insurer $30,000. This is why early settlement offers frequently come bundled with an inflated fault percentage, and why documenting the other party's clear responsibility (police report, witnesses, photos, traffic-camera footage) is the best defense against an unjustified fault reduction.
The fault reduction is applied to the gross settlement first; attorney fees, case costs, and medical liens come out of what remains. Order matters for understanding your net. For example, on a $100,000 claim with 25% fault, the gross recovery is $75,000; a 33.33% attorney fee ($25,000), $3,000 in costs, and $15,000 in liens would leave roughly $32,000 net. The comparative-negligence calculator on this page computes the fault-reduced gross; to model the fees and liens that follow, use the net-settlement calculator linked in the related-tools box. Understanding both steps prevents an unpleasant surprise at disbursement.
Fault percentages are not assigned by formula — they are negotiated, and if the case goes to trial, decided by a jury. In settlement, the adjuster and your attorney argue over the share each party bears based on the police report, statements, physical evidence, traffic laws, and accident-reconstruction analysis in serious cases. The numbers you enter into the calculator are estimates of that contested figure; the actual percentage is the product of advocacy and evidence. Because a swing of even 10–20 percentage points can move a settlement by thousands, the fault fight is often as important as the damages fight.
To make the rules concrete, here is how a $100,000 claim plays out under each rule at 40% plaintiff fault:
| Rule | Plaintiff Fault | Recovery on $100,000 |
|---|---|---|
| Pure comparative | 40% | $60,000 |
| Modified 50% bar | 40% | $60,000 (under the bar) |
| Modified 51% bar | 40% | $60,000 (under the bar) |
| Pure contributory | 40% | $0 (any fault bars) |
Now at 55% plaintiff fault: pure comparative pays $45,000; the 50% and 51% bars both pay $0 (fault is over the threshold); contributory pays $0. The differences at and above the threshold are exactly what the calculator captures.
Your state's negligence rule can be the difference between a substantial recovery and nothing. The same accident with the same facts can pay full-minus-fault in a pure-comparative state, half in a 51%-bar state at 50% fault, zero in a 50%-bar state at 50% fault, and zero in a contributory state at any fault. Before accepting an offer that bakes in a fault percentage, confirm which rule your state follows and how close the assigned fault is to a bar, because near the threshold a few points of negotiation can swing the outcome entirely.
When more than one defendant shares fault, the picture gets more complex, and the rule again varies by state. Under traditional joint and several liability, the plaintiff can recover the full amount of damages (minus their own fault) from any one defendant, leaving the defendants to sort out their shares among themselves — valuable when one defendant is insolvent or uninsured. Many states have modified this with several (proportional) liability, under which each defendant pays only its own percentage of fault, so an uncollectible defendant's share is simply lost to the plaintiff. Some states use a hybrid that applies joint liability only above a fault threshold. This calculator models a single plaintiff fault percentage; in a multi-defendant case, how the remaining fault is allocated among defendants — and which liability rule applies — determines what the plaintiff can actually collect.
Because every percentage point of fault moves real money, both sides build evidence to shift the fault allocation. The proof includes the police or incident report and any citations, photographs of the scene and vehicles, physical evidence such as skid marks and damage patterns, witness statements, traffic-camera or dash-cam footage, cell-phone records (to show distraction), and, in serious cases, accident-reconstruction experts who model speeds and angles. The applicable traffic or safety laws frame who had the right of way or breached a duty. The stronger your evidence that the other party caused the harm, the lower the fault percentage an adjuster or jury will assign to you — which, as the calculator shows, directly raises your recovery.
Comparative negligence is not limited to car crashes; it applies across personal-injury law. In a slip-and-fall claim, a property owner may argue you share fault for not watching where you were walking, ignoring a warning sign or cone, wearing inappropriate footwear, or entering an obviously hazardous area, and your recovery is reduced accordingly. In a product-liability case, a manufacturer may argue you misused the product or ignored instructions. The same state rules — pure, modified 50%/51%, or contributory — govern these reductions. The calculator works the same way regardless of the underlying accident: enter the full claim value, your estimated fault, and your state's rule to see the fault-reduced recovery.
Comparative negligence reduces your settlement by your percentage of fault: recovery equals the full claim value multiplied by (100% minus your fault %). In a pure comparative-negligence state, a $100,000 claim with 25% fault pays $75,000. In modified states, the same reduction applies until your fault reaches a 50% or 51% bar, at which point you recover nothing.
Under pure comparative negligence, you can recover no matter how much you are at fault, with your award simply reduced by your percentage, so even a 90%-at-fault plaintiff recovers 10%. Under modified comparative negligence, the same reduction applies but recovery is cut off entirely once your fault reaches the state's threshold, either 50% or 51%.
Under the 50% bar rule, you recover only if your fault is less than 50%, so at exactly 50% you get nothing. Under the 51% bar rule, you recover if your fault is 50% or less and are barred only at 51% or more. The practical difference appears at the midpoint: a 50%-at-fault plaintiff gets zero in a 50%-bar state but half in a 51%-bar state.
A small number of jurisdictions still follow pure contributory negligence, where being even 1% at fault bars recovery entirely: Alabama, Maryland, North Carolina, Virginia, and the District of Columbia. Some soften it with doctrines like last clear chance, but the baseline is the harshest negligence rule in the country, which is why clear liability evidence is essential there.
The fault reduction is applied to the gross settlement first, then attorney fees, case costs, and medical liens are deducted from what remains. For example, a $100,000 claim with 25% fault yields a $75,000 gross recovery, and the 33.33% attorney fee, costs, and liens come out of that $75,000. This calculator computes the fault-reduced gross; a separate net-settlement calculator models the fees and liens.
Fault percentages are negotiated between your attorney and the insurance adjuster based on the police report, statements, physical evidence, traffic laws, and accident reconstruction, and if the case goes to trial, a jury decides. The figure you enter into the calculator is an estimate of that contested number, which is determined by evidence and advocacy rather than a fixed formula.
Yes, in almost every state. In pure comparative-negligence states you recover regardless of your fault, just reduced by your percentage. In modified states you recover as long as your fault stays under the 50% or 51% bar. Only in the few contributory-negligence jurisdictions does any fault at all bar your recovery, so your state's rule determines the outcome.