How to Use the Car Accident Fault Split Calculator
Unlike countries with one nationwide standard, U.S. car accident liability rules vary significantly by state. This calculator lets you select your state's negligence rule, enter your estimated percentage of fault, and see how much of your damages you could realistically recover from the other driver's insurer.
Most states use comparative negligence: in "pure" comparative states like California, you can recover damages reduced by your fault percentage no matter how much you were at fault. "Modified" comparative states (most common) cut off recovery entirely once your fault crosses a threshold — typically 50% or 51%, depending on the state. A small number of states, including Alabama, Maryland, North Carolina, Virginia, and Washington D.C., still use contributory negligence, where being even slightly at fault can bar you from recovering anything.
The percentages used here are estimates for planning purposes only — actual fault determinations depend on police reports, witness statements, dashcam footage, and insurer investigation, and can ultimately be decided by a court if disputed. Always confirm the exact rule and process that applies in your state.
Frequently Asked Questions
No. Most states use some form of comparative negligence, but a handful use contributory negligence, an all-or-nothing rule. Modified comparative states also differ on whether the bar is 50% or 51% fault. Always confirm your specific state's rule.
In pure and modified comparative negligence states, usually yes — your recovery is just reduced by your percentage of fault. In contributory negligence states, being even 1% at fault can bar you from recovering anything.
Insurance adjusters typically make the initial determination based on police reports, statements, and evidence like dashcam footage. If you disagree, you can dispute it with the insurer or ultimately have a court or jury decide.