Why do some calculators show different numbers?
Different tools use different data sources, baseline years, and weighting systems. Some normalize to 100, others to different baselines. Some weight violent and property crime equally, others don't. There's no single "correct" crime index—they're all approximations. Focus on relative differences between cities within the same tool, not absolute numbers across tools.
What's a "safe" crime index score?
Below 100 is below the national average. Below 50 is significantly below average. But "safe" depends on context. A suburb at 30 feels different than a city at 30—the city probably has more total incidents just because more people are there. Compare similar city types when possible.
Should I avoid cities with high crime indices?
Not necessarily. Millions of people live in cities with above-average crime indices and never experience incidents. The index tells you statistical probability across the entire population, not your personal risk. Your neighborhood choice, routines, and awareness affect your actual exposure far more than the city average.
Why is violent crime weighted more than property crime?
Because the impact differs. A stolen bike is frustrating and costs money. A robbery affects your physical safety and mental wellbeing differently. The 60/40 split reflects this severity difference. If property crime matters more to you personally (maybe you have expensive equipment), mentally adjust the comparison accordingly.
Does a low crime index mean good policing?
Not directly. Low crime can mean good policing, but also affluent populations (crime correlates with poverty), low population density (fewer opportunities for crime), or low reporting rates. High crime indices don't automatically mean bad policing—they often reflect socioeconomic factors outside police control.
Where does this data come from?
Primarily FBI Uniform Crime Reporting (UCR) data, supplemented by Bureau of Justice Statistics. This data comes from local law enforcement agencies reporting to federal programs. It's the most comprehensive public crime data available, though it has limitations noted above.