What is Delta-V in a car accident?

Delta-V is the change in velocity a vehicle experiences during a collision, measured in mph or kph. It is the single most important metric in crash reconstruction and injury causation analysis because it directly correlates with occupant injury risk.

How accurate is the Silent Witness Delta-V calculator?

Our AI is validated to 96% accuracy against NHTSA and IIHS crash test benchmarks. It uses physics-based modeling (crush energy, PDOF, principal direction of force) rather than generative estimation.

Is the Delta-V calculator really free?

Yes. The online calculator is free for anyone to use. Full court-ready reports with biomechanical injury causation and expert-witness-grade documentation are available on our paid platform.

What photos work best for Delta-V estimation?

Clear photos showing the impact area from multiple angles work best. Include the full vehicle when possible and avoid photos with glare, heavy shadows, or partial occlusion. JPEG, PNG, or WebP formats up to 10MB each, maximum 5 images.

Can I use Delta-V calculator output in court?

The free estimate is informational. For litigation, request our full report which includes methodology, validation data, and Daubert-standard documentation used by attorneys and expert witnesses.

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Delta-V & Injury Calculator

Upload up to 5 photos of vehicle damage to get an estimated impact speed and injury probability analysis.

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