Free Tool

ERG Guide Number Finder

Type a UN number or material name — get the Emergency Response Guidebook (ERG) guide number back instantly, along with hazard class and packing group. Covers 100+ commonly shipped materials, no sign-up.

ERG Guide Number
UN Number: Class: Packing Group:

Start typing a UN number or material name above.

Other matches

One number, one response page

Every UN number maps to exactly one ERG guide number — a two- or three-digit reference to a standardized page in the Emergency Response Guidebook covering potential hazards, public safety distances, and initial response actions for that material or material family. This tool matches your UN number or material name against a database of common entries and returns that guide number directly, so you don't have to flip through the index first.

This tool returns the guide number only, not the full guide page content. Pair it with your current official ERG for the complete hazards, isolation distances, and response steps — or see the UN Number Lookup tool for the full browsable table.

Ask it instead of searching for it

This page matches exact UN numbers and known material names. HazMat Pro's Identify feature goes further — hold to speak or type a free-text description, like "smoking pallet of batteries after a forklift strike," and it resolves the material with full PPE and response guidance, fully offline.

HazMat Pro

Voice-powered Identify, plus placards, UN numbers, and ERG guide numbers — searchable and fully offline.

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Common questions

What is an ERG guide number?

A two- or three-digit page reference in the Emergency Response Guidebook covering potential hazards, safety distances, and initial response steps for a material or material family. Every UN number maps to one.

How do I find the ERG guide number for a UN number or material?

Type the UN number or material name above. It's matched against 100+ commonly shipped materials and returns the guide number, class, and packing group.

Does this replace the physical ERG guidebook?

No. It returns the guide number only, not the full guide page content. Always consult the current official ERG for complete response guidance.

What if my material isn't in this tool?

This covers 100+ of the most common materials as a free reference. HazMat Pro's Identify feature also handles free-text and descriptive queries offline.

More hazmat resources

Disclaimer: This tool is an independent reference for training and lookup purposes only. It is not affiliated with the US DOT, PHMSA, or the ERG's publisher, and it does not replace the current official Emergency Response Guidebook, 49 CFR §172.101, or your organization's SOPs. Always confirm against current official sources before acting on this data in the field.