NHTSA 5-Star Crash Test Ratings Explained: What the Stars Actually Measure

Quick answer: NHTSA's 5-star rating is the US government's measure of how likely you are to be seriously injured in three staged crashes — a frontal impact, a side impact, and a rollover — with 5 stars meaning the lowest injury risk. It is not a score out of 100 and not a durability rating; it is crash physics measured on real production cars with instrumented dummies. Look up any vehicle's stars free with our Crash Test Ratings lookup.

The three tests behind the stars

Frontal crash. The car hits a rigid barrier head-on at 35 mph (56 km/h) — roughly two identical cars hitting each other at 35 mph each. Dummies in the driver and front-passenger seats record head, neck, chest and leg forces. Important limit: frontal stars are only comparable between vehicles of similar weight, because a heavier car fares better against a lighter one in the real world regardless of its rating.

Side crash. Two tests: a 3,015-lb barrier strikes the side at 38.5 mph (simulating being T-boned at a junction), and the car is slid sideways into a rigid pole at 20 mph (simulating sliding off the road into a tree or post). The pole test is what pushed side-curtain airbags into almost every new car.

Rollover. Partly a measurement — how top-heavy the vehicle is — and partly a dynamic manoeuvre test. Tall SUVs and pickups score lower here for reasons no airbag can fix.

The overall rating blends all three, weighted by how often each crash type kills people in real-world data.

What the stars do NOT tell you

• They say nothing about avoiding a crash — automatic braking, lane-keeping and stability control are noted separately as "recommended technologies", not scored into the stars.
• A 5-star small car and a 5-star large SUV are not equally safe in a collision with each other; weight still wins.
• Ratings apply to the tested model year and body style; a redesign resets them, and NHTSA cannot test every trim.
• No test covers rear impacts or pedestrian protection — that is why crash stars belong next to the other public records, not instead of them.

How to use ratings when buying

Between two cars you are already choosing between, the extra star is the cheapest safety upgrade available — but only after the basics. Check the same car's open recalls (safety defects the maker must fix free), its owner complaints and years to avoid, a VIN decode to confirm it is what the listing says, and the tire age. All five together take about ten minutes — the sequence is in our used-car safety guide.

NHTSA vs IIHS

You will also see IIHS ratings ("Top Safety Pick"). That is the US insurance industry's lab with different tests — small-overlap frontal, headlight quality, crash-avoidance — so the two systems disagree sometimes. A genuinely safe car does well in both; a car that shines in only one is telling you where its engineers focused.

Whatever you drive, the risk you cannot rate is the road itself — see how your country compares on our global driving-risk rankings, and keep the local number from our emergency numbers directory saved.